A stochastic template placement algorithm for gravitational wave data analysis (2009)
Harry, Ian, Allen, Bruce, Sathyaprakash, B. S.
This paper presents an algorithm for constructing matched-filter template banks in an arbitrary parameter space. The method places templates at random, then removes those which are "too close"...
Updike and the Past Recaptured (2009)
Sewanee Review - Volume 117, Number 3, Summer 2009
Exploiting Large-Scale Correlations to Detect Continuous Gravitational Waves (2009)
Pletsch, Holger J., Allen, Bruce
Fully coherent searches (over realistic ranges of parameter space and year-long observation times) for unknown sources of continuous gravitational waves are computationally prohibitive. Less...
The Einstein@Home search for periodic gravitational waves in LIGO S4 data (2009)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
A search for periodic gravitational waves, from sources such as isolated rapidly-spinning neutron stars, was carried out using 510 hours of data from the fourth LIGO science run (S4). The search was...
The Einstein@Home search for periodic gravitational waves in early S5 LIGO data (2009)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
This paper reports on an all-sky search for periodic gravitational waves from sources such as deformed isolated rapidly spinning neutron stars. The analysis uses 840 hours of data from 66 days of the...
Exploiting Large-Scale Correlations to Detect Continuous Gravitational Waves (2009)
Pletsch, Holger J., Allen, Bruce
Fully coherent searches (over realistic ranges of parameter space and year-long observation times) for unknown sources of continuous gravitational waves are computationally prohibitive. Less...
System Monitor Guide and Reference Administration Guide Command Reference (2008)
• These notes are a combination of available DB2 documentation from IBM and experience in using the product. Keep in mind that some things at the detail level will change from release to release....
Blandford's Argument: The Strongest Continuous Gravitational Wave Signal (2008)
Knispel, Benjamin, Allen, Bruce
For a uniform population of neutron stars whose spin-down is dominated by the emission of gravitational radiation, an argument by Blandford states that the expected gravitational wave amplitude of...
Implications for the origin of GRB 070201 from LIGO observations (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We analyzed the available LIGO data coincident with GRB 070201, a short-duration, hard-spectrum gamma-ray burst (GRB) whose electromagnetically determined sky position is coincident with the spiral...
Astrophysically triggered searches for gravitational waves: status and prospects (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
In gravitational-wave detection, special emphasis is put onto searches that focus on cosmic events detected by other types of astrophysical observatories. The astrophysical triggers, e. g. from...
A joint search for gravitational wave bursts with AURIGA and LIGO (2008)
Baggio, L., Bignotto, M., Bonaldi, M., Cerdonio, M., De Rosa, M., Falferi, P., ...
The first simultaneous operation of the AURIGA detector(63) and the LIGO observatory(64) was an opportunity to explore real data, joint analysis methods between two very different types of...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We present the results of a search for short-duration gravitational-wave bursts associated with 39 gamma-ray bursts (GRBs) detected by gamma-ray satellite experiments during LIGO's S2, S3, and S4...
Search for gravitational waves from binary inspirals in S3 and S4 LIGO data (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on a search for gravitational waves from the coalescence of compact binaries during the third and fourth LIGO science runs. The search focused on gravitational waves generated during the...
All-sky search for periodic gravitational waves in LIGO S4 data (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50-1000 Hz and with the frequency's time derivative in the range -1 x 10(-8) Hz s(-1) to...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on the methods and results of the first dedicated search for gravitational waves emitted during the inspiral of compact binaries with spinning component bodies. We analyze 788 hours of data...
Beating the spin-down limit on gravitational wave emission from the Crab pulsar (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present direct upper limits on gravitational wave emission from the Crab pulsar using data from the first 9 months of the fifth science run of the Laser Interferometer Gravitational-wave...
Searching for gravitational waves from Cassiopeia A with LIGO (2008)
Wette, K., Owen, B. J., Allen, Bruce, Ashley, M., Betzwieser, J., Christensen, Nelson, ...
We describe a search underway for periodic gravitational waves from the central compact object in the supernova remnant Cassiopeia A. The object is the youngest likely neutron star in the Galaxy. Its...
Search for Gravitational-Wave Bursts from Soft Gamma Repeaters (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present a LIGO search for short-duration gravitational waves (GWs) associated with soft gamma ray repeater (SGR) bursts. This is the first search sensitive to neutron star f modes, usually...
First joint search for gravitational-wave bursts in LIGO and GEO 600 data (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present the results of the first joint search for gravitational-wave bursts by the LIGO and GEO 600 detectors. We search for bursts with characteristic central frequencies in the band 768-2048 Hz...
All-sky LIGO Search for Periodic Gravitational Waves in the Early S5 Data (2008)
Allen, Bruce, LIGO Scienticic Collaboration
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50--1100 Hz and with the frequency's time derivative in the range -5.0E-9 Hz/s to zero....
Searching for gravitational waves from Cassiopeia A with LIGO (2008)
Wette, K., Owen, B. J., Allen, Bruce, Ashley, M., Betzwieser, J., Christensen, Nelson, ...
We describe a search underway for periodic gravitational waves from the central compact object in the supernova remnant Cassiopeia A. The object is the youngest likely neutron star in the Galaxy. Its...
Searching for gravitational waves from Cassiopeia A with LIGO (2008)
Wette, K., Owen, B. J., Allen, Bruce, Ashley, M., Betzwieser, J., Christensen, Nelson, ...
We describe a search underway for periodic gravitational waves from the central compact object in the supernova remnant Cassiopeia A. The object is the youngest likely neutron star in the Galaxy. Its...
WISC-MILW-95-TH-11 GRAVITATIONAL RADIATION FROM REALISTIC COSMIC STRING LOOPS (2007)
We examine the rates at which energy and momentum are radiated into gravitational waves by a large set of realistic cosmic string loops. The string loops are generated by numerically evolving parent...
Abbott, B., Abbott, R., Adhikari, R., Boschi, V., Agresti, Juri, Ajith, P., ...
We report on a search for gravitational waves from binary black hole inspirals in the data from the second science run of the LIGO interferometers. The search focused on binary systems with component...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
Data from the LIGO Livingston interferometer and the ALLEGRO resonant bar detector, taken during LIGO's fourth science run, were examined for cross-correlations indicative of a stochastic...
Upper limit map of a background of gravitational waves (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We searched for an anisotropic background of gravitational waves using data from the LIGO S4 science run and a method that is optimized for point sources. This is appropriate if, for example, the...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. Both searches exploit fully coherent matched filtering and...
Upper limits on gravitational wave emission from 78 radio pulsars (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
Search for gravitational-wave bursts in LIGO data from the fourth science run (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The fourth science run of the LIGO and GEO 600 gravitational-wave detectors, carried out in early 2005, collected data with significantly lower noise than previous science runs. We report on a search...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The Laser Interferometer Gravitational‐Wave Observatory (LIGO) has performed the fourth science run, S4, with significantly improved interferometer sensitivities with respect to previous runs....
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO 600 gravitational wave detector uses advanced technologies including signal recycling and monolithic fused-silica suspensions to achieve a sensitivity close to the kilometre scale LIGO and...
Search for gravitational waves from binary black hole inspirals in LIGO data (2006)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
We report on a search for gravitational waves from binary black hole inspirals in the data from the second science run of the LIGO interferometers. The search focused on binary systems with component...
Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries (2006)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
We search for coincident gravitational wave signals from inspiralling neutron star binaries using LIGO and TAMA300 data taken during early 2003. Using a simple trigger exchange method, we perform an...
Status of the GEO600 detector (2006)
Lück, Harald, Hewitson, Martin, Ajith, P., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, ...
Of all the large interferometric gravitational-wave detectors, the German/British project GEO600 is the only one which uses dual recycling. During the four weeks of the international S4 data-taking...
Search for gravitational-wave bursts in LIGO's third science run (2006)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Allen, Bruce, Amin, R., ...
We report on a search for gravitational-wave bursts in data from the three LIGO interferometric detectors during their third science run. The search targets sub-second bursts in the frequency range...
Designing a Runtime System for Volunteer Computing (2006)
Anderson, David P., Christensen, Carl, Allen, Bruce
Volunteer computing is a form of distributed computing in which the general public volunteers processing and storage to scientific research projects. BOINC, a middleware system for volunteer...
Designing a runtime system for volunteer computing (2006)
David P. Anderson, Carl Christensen, Bruce Allen
Volunteer computing is a form of distributed computing in which the general public volunteers processing and storage to scientific research projects. BOINC, a middleware system for volunteer...
Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Allen, Bruce, ...
We perform a wide parameter-space search for continuous gravitational waves over the whole sky and over a large range of values of the frequency and the first spin-down parameter. Our search method...
Upper limits on gravitational wave bursts in LIGO's second science run (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Allen, Bruce, ...
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We use data from the second science run of the LIGO gravitational-wave detectors to search for the gravitational waves from primordial black hole binary coalescence with component masses in the range...
Search for gravitational waves from galactic and extra-galactic binary neutron stars (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We use 373 hours ([approximate]15 days) of data from the second science run of the LIGO gravitational-wave detectors to search for signals from binary neutron star coalescences within a maximum...
Limits on gravitational-wave emission from selected pulsars using LIGO data (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Upper limits on a stochastic background of gravitational waves (2005)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The Laser Interferometer Gravitational-Wave Observatory has performed a third science run with much improved sensitivities of all three interferometers. We present an analysis of approximately 200...
Grote, Hartmut, Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
Since December 2003, the gravitational-wave detector GEO 600 has routinely operated in the dual recycled mode, using a lock acquisition scheme based on the detection of optical sideband power at the...
χ2 time-frequency discriminator for gravitational wave detection (2005)
Searches for known waveforms in gravitational wave detector data are often done using matched filtering. When used on real instrumental data, matched filtering often does not perform as well as might...
The LIGO gravitational wave obervatories: Recent results and future plans (2005)
Harry, G. M., Adhikari, R., Ballmer, S., Bayer, K., Betzwieser, J., Bochner, B., ...
Allen, Bruce, Anderson, Warren G., Brady, Patrick R., Brown, Duncan A., Creighton, Jolien D. E.
Searches for gravitational waves from binary neutron stars or sub-solar mass black holes by the LIGO Scientific Collaboration use the findchirp algorithm: an implementation of standard matched filter...
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
For 17 days in August and September 2002, the LIGO and GEO interferometer gravitational wave detectors were operated in coincidence to produce their first data for scientific analysis. Although the...
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134 (2004)
Woan, G., Allen, Bruce, Abbott, B., Abbott, F., Adhikari, R., Amin, R., ...
The first science run of the LIGO and GEO gravitational wave detectors presented the opportunity to test methods of searching for gravitational waves from known pulsars. Here we present new direct...
Siemens, Xavier, Allen, Bruce, Creighton, Jolien D. E., Hewitson, Martin, Landry, Michael
The conversion of the read-out from the anti-symmetric port of the LIGO interferometers into gravitational strain has thus far been performed in the frequency domain. Here we describe a conversion in...
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Data collected by the GEO 600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous gravitational waves from the pulsar J1939...
Analysis of first LIGO science data for stochastic gravitational waves (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These...
First upper limits from LIGO on gravitational wave bursts (2004)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We report on a search for gravitational wave bursts using data from the first science run of the Laser Interferometer Gravitational Wave Observatory (LIGO) detectors. Our search focuses on bursts...
LIGO: S1 Science Results and Plans Beyond (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Commissioning, characterization and operation of the dual-recycled GEO 600 (2004)
Smith, J. R., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
The German-British laser-interferometric gravitational-wave detector GEO 600 is currently being commissioned as part of a worldwide network of gravitational-wave detectors. GEO 600 recently became...
Strain, Kenneth A., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
The GEO 600 laser interferometer with 600m armlength is part of a worldwide network of gravitational wave detectors. GEO 600 is unique in having advanced multiple pendulum suspensions with a...
Analysis of LIGO data for gravitational waves from binary neutron stars (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and the Magellanic Clouds. The analysis uses data taken by two of the three LIGO interferometers...
Allen, Bruce, Creighton, Jolien D. E., Flanagan, Eanna E., Romano, Joseph D.
In a previous paper (paper I), we derived a set of near-optimal signal detection techniques for gravitational wave detectors whose noise probability distributions contain non-Gaussian tails. The...
Bose, Sukanta, Allen, Bruce, Landry, Michael, Lazzarini, Albert, Leonor, Isabel, Marka, Szabolcs, ...
We describe the utility of simulated-signal injection studies on earth-based gravitational-wave (GW) interferometric data toward obtaining bounds on the strength of a stochastic GW background. The...
Merlin cluster - report for the BAR (2002)
Allen, Bruce, Aulbert, Carsten, Berukoff, Steven, Cutler, Curt, Feg, Thomas, Naundorf, Holger, ...
This is the report to the BAR that contains the design specifications for the cluster that the GEO data analysis group at the AEI is planning to build in order to perform searches for continuous...
Allen, Bruce, Creighton, Jolien D. E., Flanagan, Eanna E., Romano, Joseph D.
Gravitational wave detectors will need optimal signal-processing algorithms to extract weak signals from the detector noise. Most algorithms designed to date are based on the unrealistic assumption...
Cosmic strings, loops, and linear growth of matter perturbations (2002)
Wu, Jiun-Huei Proty, Avelino, Pedro P., Shellard, E. P. S., Allen, Bruce
We describe a detailed study of string-seeded structure formation using high resolution numerical simulations in open universes and those with a non-zero cosmological constant. We provide a...
A Virtual Data Grid for LIGO (2001)
Deelman, Ewa, Kesselman, Carl, Williams, Roy, Lazzarini, Albert, Prince, Thomas A., Romano, Joe, ...
GriPhyN (Grid Physics Network) is a large US collaboration to build grid services for large physics experiments, one of which is LIGO, a gravitational-wave observatory. This paper explains the...
Waveforms for gravitational radiation from cosmic string loops (2001)
Allen, Bruce, Ottewill, Adrian C.
We obtain general formulas for the plus- and cross-polarized waveforms of gravitational radiation emitted by a cosmic string loop in a transverse, traceless (synchronous, harmonic) gauge. These...
A Virtual Data Grid for LIGO (2001)
Deelman, Ewa, Kesselman, Carl, Williams, Roy, Lazzarini, Albert, Prince, Thomas A., Romano, Joe, ...
GriPhyN (Grid Physics Network) is a large US collaboration to build grid services for large physics experiments, one of which is LIGO, a gravitational-wave observatory. This paper explains the...
Security as a Dimension of Quality of Service in Active Service Environments (2001)
Cynthia Irvine Tim, Tim Levin, Evie Spyropoulou, Bruce Allen
Introduction The introduction of metacomputing and distributed resource management mechanisms to the Internet and World Wide Web will make available to users and applications a diverse set of...
Multi-taper Spectral Analysis in Gravitational Wave Data Analysis (2000)
Spectral estimation plays a significant role in gravitational wave data analysis. We provide a brief introduction to multi-taper methods which use multiple orthogonal tapers (or windows) to provide...
0 Contents TABLE OF CONTENTS (2000)
Bruce Allen, Steve Drasco, Serge Droz, Eanna Flanagan, Wensheng Hua, Scott Hughes, ...
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
Is the squeezing of relic gravitational waves produced by inflation detectable? (1999)
Allen, Bruce, Flanagan, Eanna E., Papa, Maria Alessandra
Grishchuk has shown that the stochastic background of gravitational waves produced by an inflationary phase in the early Universe has an unusual property: it is not a stationary Gaussian random...
Allen, Bruce, Romano, Joseph D.
We analyze the signal processing required for the optimal detection of a stochastic background of gravitational radiation using laser interferometric detectors. Starting with basic assumptions about...
Automatic cross-talk removal from multi-channel data (1999)
Allen, Bruce, Hua, Wensheng, Ottewill, Adrian C.
A technique is described for removing interference from a signal of interest ("channel 1") which is one of a set of N time-domain instrumental signals ("channels 1 to N"). We assume that channel 1 is...
Cosmic string loops and large-scale structure (1999)
Avelino, P. P., Shellard, E. P. S., Wu, J. H. P., Allen, Bruce
We investigate the contribution made by small loops from a cosmic string network as seeds for large-scale structure formation. We show that cosmic string loops are highly correlated with the...
Observational Limit on Gravitational Waves from Binary Neutron Stars in the Galaxy (1999)
Allen, Bruce, Blackburn, J. K., Brady, P. R., Creighton, J. D. E., Creighton, T., Droz, S., ...
Using optimal matched filtering, we search 25 hours of data from the LIGO 40-m prototype laser interferometric gravitational-wave detector for gravitational-wave chirps emitted by coalescing binary...
GRASP: a data analysis package for gravitational wave detection (1999)
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users manual...
GRASP: a data analysis package for gravitational wave detection (1999)
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users manual...
Cosmic-String–Seeded Structure Formation (1998)
Avelino, P. P., Shellard, E. P. S., Wu, J. H. P., Allen, Bruce
We describe the results of high-resolution numerical simulations of string-induced structure formation in open universes and those with a nonzero cosmological constant. For models with Γ = Ωh =...
CMB anisotropy due to cosmic strings: Large angular scale (1998)
Allen, Bruce, Caldwell, R. R., Shellard, E. P. S., Stebbins, A., Veeraraghavan, S.
Non-Gaussian Features of Linear Cosmic String Models (1998)
Avelino, P. P., Shellard, E. P. S., Wu, J. H. P., Allen, Bruce
We investigate the non-Gaussian properties of cosmic string-seeded linear density perturbations with cold and hot dark matter backgrounds using high-resolution numerical simulations. We compute the...
Structure Formation Seeded by Cosmic Strings (1998)
Avelino, P. P., Shellard, E. P. S., Wu, J. H. P., Allen, Bruce
This revised version was published online in July 2006 with corrections to the Cover Date.
Cosmic Microwave Background Anisotropy Induced by Cosmic Strings on Angular Scales ≳15′ (1997)
Allen, Bruce, Caldwell, R. R., Dodelson, S., Knox, L., Shellard, E. P. S., Stebbins, A.
We have computed an estimate of the angular power spectrum of the cosmic microwave background induced by cosmic strings on angular scales ≳15′, using a numerical simulation of a cosmic string...
Detecting relic gravitational radiation from string cosmology with LIGO (1996)
A characteristic spectrum of relic gravitational radiation is produced by a period of “stringy inflation” in the early Universe. This spectrum is unusual, because the energy density rises rapidly...
Detection of anisotropies in the gravitational-wave stochastic background (1996)
Allen, Bruce, Ottewill, Adrian C.
By correlating the signals from a pair of gravitational-wave detectors, one can undertake sensitive searches for a stochastic background of gravitational radiation. If the stochastic background is...
Long-range effects of cosmic string structure (1996)
Allen, Bruce, Kay, Bernard S., Ottewill, Adrian C.
We combine and further develop ideas and techniques of Allen and Ottewill [Phys. Rev. D 42, 2669 (1990)] and Kay and Studer [Commun. Math. Phys. 139, 103 (1991)] for calculating the long-range...
Gravitational Wave Detector Sites (1996)
Locations and orientations of current and proposed laser-interferometric gravitational wave detectors are given in tabular form.
Large Angular Scale Anisotropy in Cosmic Microwave Background Induced by Cosmic Strings (1996)
Allen, Bruce, Caldwell, R. R., Shellard, E. P. S., Stebbins, A., Veeraraghavan, S.
We simulate the anisotropy in the cosmic microwave background (CMB) induced by cosmic strings. By numerically evolving a network of cosmic strings we generate full-sky CMB temperature anisotropy...
The stochastic gravity-wave background: sources and detection (1996)
A world-wide effort is now underway to build gravitational wave detectors based on highly-sensitive laser interferometers. When data from detectors at different sites is properly combined, it will...
Allen, Bruce, Caldwell, R. R., Koranda, Scott
Primordial gravitational waves are created during the de Sitter phase of an exponentially, expanding (inflationary) universe, due to quantum zero-point vacuum fluctuations. These waves produce...
Closed-form expression for the momentum radiated from cosmic string loops (1995)
Allen, Bruce, Casper, Paul, Ottewill, Adrian C.
We modify the recent analytic formula given by Allen and Casper for the rate at which piecewise linear cosmic string loops lose energy to gravitational radiation to yield the analogous analytic...
We examine stochastic temperature fluctuations of the cosmic background radiation (CBR) arising via the Sachs-Wolfe effect from gravitational wave perturbations produced in the early universe. We...
Gravitational radiation from realistic cosmic string loops (1995)
We examine the rates at which energy and momentum are radiated into gravitational waves by a large set of realistic cosmic string loops. The string loops are generated by numerically evolving parent...
Cosmic microwave background radiation anisotropy induced by cosmic strings (1995)
Allen, Bruce, Caldwell, R. R., Shellard, E. P. S., Stebbins, A., Veeraraghavan, S.
We report on a current investigation of the anisotropy pattern induced by cosmic strings on the cosmic microwave background radiation (MBR). We have numerically evolved a network of cosmic strings...
Maximally symmetric spin-two bitensors on S3 and H3 (1995)
The transverse traceless spin-two tensor harmonics on S3 and H3 may be denoted by Tab(kl). The index k labels the (degenerate) eigenvalues of the Laplacian √ and l the other indices. We compute the...
Cosmic strings confront COBE (1995)
Allen, Bruce, Caldwell, R. R., Shellard, E. P. S., Stebbins, A., Veeraraghavan, S.
We investigate large-angle anisotropies in the cosmic microwave radiation background which are induced by cosmic strings. We numerically evolve a string network from a redshift Z-100 to the present...
Closed-form expression for the gravitational radiation rate from cosmic strings (1994)
We present a new formula for the rate at which cosmic strings lose energy into gravitational radiation, valid for all piecewise-linear loops of infinitely thin cosmic string. At any time, such a loop...
Analytic results for the gravitational radiation from a class of cosmic string loops (1994)
Allen, Bruce, Casper, Paul, Ottewill, Adrian C.
Cosmic string loops are defined by a pair of periodic functions a and b, which trace out unit-length closed curves in three-dimensional space. We consider a particular class of loops, for which a...
CBR anisotropy from primordial gravitational waves in inflationary cosmologies (1994)
We examine stochastic temperature fluctuations of the cosmic background radiation (CBR) arising via the Sachs-Wolfe effect from gravitational wave perturbations produced in the early Universe. These...
Foster, B., Heath, G. P., Llewellyn, T. J., Gingrich, D. M., Harnew, N., Hallam-Baker, P. M., ...
The Central Tracking Detector of the ZEUS experiment employs a time difference technique to measure the z coordinate of each hit. The method provides fast, three-dimensional space point measurements...
Photon and graviton Green's functions on cosmic string space-times (1992)
Allen, Bruce, Mc Laughlin, John G., Ottewill, Adrian C.
We present the Green's functions for photons and gravitons in the vicinity of an idealized cosmic string. We stress the importance of the Ward identities involved and the necessity for "smoothing"...
Gauge independence in Hadamard renormalization (1992)
Allen, Bruce, Ottewill, Adrian C.
We examine the dependence of the Hadamard-renormalized stress-energy tensor on the gauge-fixing parameter for electromagnetism and one-loop gravity. Simple arguments show that the stress-energy...
Gravitational radiation from cosmic strings (1992)
Allen, Bruce, Shellard, E. P. S.
A cosmic-string network in an expanding universe evolves by losing energy to loops which in turn oscillate and emit gravitational radiation. The power radiated at a frequency corresponding to the nth...
Cosmological constraints on cosmic-string gravitational radiation (1992)
The primordial nucleosynthesis and pulsar timing noise constraints on cosmic-string gravitational radiation are computed. The computation consists of a numerical integration of the...
Examples of the Vilkovisky-Dewitt effective action in one-loop quantum gravity (1992)
Allen, Bruce, Mc Laughlin, John G., Ottewill, Adrian C.
We present two examples where the contribution of one-loop gravitons to the renormalized stress-energy tensor may be calculated explicitly from both the standard and the Vilkovisky-DeWitt effective...
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This
Bruce Allen, Warren Anderson, R. Balasubramanian, Kent Blackburn, Patrick Brady, Jim Brau, ...
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
Bruce Allen, Ben Owen, Joseph Romano, Alan Wiseman
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
Bruce Allen, Ben Owen, Joseph Romano, Alan Wiseman
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
Bruce Allen, Warren Anderson, R. Balasubramanian, Kent Blackburn, Patrick Brady, Jim Brau, ...
GRASP (Gravitational Radiation Analysis & Simulation Package) is a public-domain software tool-kit designed for analysis and simulation of data from gravitational wave detectors. This users...
Small-scale structure on a cosmic-string network (1991)
We construct an analytic model of the accumulation of small-scale structure on a cosmic-string network in an expanding universe. The structure is composed of kinks which form when the string segments...
Kinky structure on strings (1991)
The evolution of the linear density of kinks on a cosmic string network is examined, and new possibilities about the behavior of the string network are considered. These include (1) allowing kinky...
Effects of curvature couplings for quantum fields on cosmic-string space-times (1990)
Allen, Bruce, Ottewill, Adrian C.
The effect of ξR curvature coupling terms in the equation of motion of a massless scalar field are considered on a cosmic-string background. Realistic two- and four-dimensional models of a string,...
Cosmic-string evolution: A numerical simulation (1990)
Allen, Bruce, Shellard, E. P. S.
A system of intercommuting cosmic strings is numerically evolved in a homogeneous radiation-dominated expanding universe. Further evidence for the existence of a ‘‘scaling’’ solution is...
Generation of structure on a cosmic-string network (1990)
When cosmic strings cross and intercommute, four kinks are created. We calculate the linear density of these kinks, K(t), in an expanding universe. After a period of rapid initial growth, K(t)...
Using gravitational lenses to detect gravitational waves (1990)
Gravitational lenses could be used to detect gravitational waves, because a gravitational wave affects the travel-time of a light ray. In a gravitational lens, this effect produces time-delays...
Gravitational lenses as long-baseline gravitational-wave detectors (1989)
Gravitational waves produce a time delay between the different images of a gravitational lens. The measurements of the time delay in the gravitational lens 0957±561 put new limits on the amplitude...
Massless scalar and antisymmetric tensor fields in de Sitter space (1988)
Pathinayake, Chandra, Vilenkin, Alexander, Allen, Bruce
The theory of a massless, minimally coupled scalar field φ is closely related to that of a massless, antisymmetric tensor field Aμν. It is shown that in de Sitter space the field Aμν has a de...
The graviton propagator in homogeneous and isotropic spacetimes (1987)
We find the propagator for gravitons in spacetimes with homogeneous and isotropic flat (k=0) spatial sections. The method also applies to the k = + 1 and K = −1 cases. The vacuum state is assumed...
An evaluation of the graviton propagator in de sitter space (1987)
The graviton propagator in four-dimensional de Sitter space is found in closed form. The vacuum state is taken to be the de Sitter-invariant “euclidean” or “Gibbons-Hawking” vacuum. The...
Anti-de Sitter space at finite temperature (1987)
Allen, Bruce, Folacci, Antoine, Gibbons, G. W.
We consider a conformally invariant scalar field at finite temperature in anti-de Sitter space, and find the symmetric two-point function. Since it is meromorphic and it has both a real-time and...
Massless minimally coupled scalar field in de Sitter space (1987)
Allen, Bruce, Folacci, Antoine
We quantize the massless minimally coupled scalar field in de Sitter space, and find a one-complex-parameter family of O(4)-invariant Hadamard Fock vacua which break de Sitter invariance. The...
Stochastic gravity-wave background in inflationary-universe models (1987)
The gravitational-wave-noise power spectrum P(ω) is found for a simple cosmological model with an ‘‘inflationary’’ early stage of expansion. The source of the gravitational-wave noise is...
Renormalized graviton stress-energy tensor in curved vacuum space-times (1987)
Allen, Bruce, Folacci, Antoine, Ottewill, Adrian C.
The graviton contribution to the renormalized one-loop effective stress-energy tensor is calculated in an arbitrary vacuum space-time with a cosmological constant. This is done for (1) the standard...
Gravitons In De Sitter Space (1987)
Everyone knows that "Einstein's greatest mistake", the cosmological constant ~, is very close to zero 111. There have been many attempts to explain why A must be exactly zero 121, but none of these...
An evaluation of the graviton propagator in de sitter space (1987)
The graviton propagator in four-dimensional de Sitter space is found in closed form. The vacuum state is taken to be the de Sitter-invariant “euclidean” or “Gibbons-Hawking” vacuum. The...
An evaluation of the graviton propagator in de sitter space (1987)
The graviton propagator in four-dimensional de Sitter space is found in closed form. The vacuum state is taken to be the de Sitter-invariant “euclidean” or “Gibbons-Hawking” vacuum. The...
Vector two-point functions in maximally symmetric spaces (1986)
Allen, Bruce, Jacobson, Theodore
We obtain massive and massless vector two-point functions in maximally symmetric spaces (and vacua) of any number of dimensions. These include de Sitter space and anti-de Sitter space, and their...
Spinor two-point functions in maximally symmetric spaces (1986)
The two-point function for spinors on maximally symmetric four-dimensional spaces is obtained in terms of intrinsic geometric objects. In the massless case, Weyl spinors in anti de Sitter space can...
Does statistical mechanics equal one-loop quantum field theory? (1986)
The ‘‘thermodynamic’’ partition function ZT(β)=Jnexp(-βEn) is compared to the Euclidean ‘‘quantum’’ path integral ZQ(β)=Fd[φ]exp(-S) over (anti)periodic fields φ(τ+β)=±φ(τ)....
Graviton propagator in de Sitter space (1986)
We consider the graviton propagator in a de Sitter background. The propagator depends upon the choice of a gauge-fixing term Lgauge=1/2F2, and we consider the ‘‘ε gauges’’ with...
Vacuum states in de Sitter space (1985)
We examine possible vacuum states for scalar fields in de Sitter space, concentrating on those states (1) invariant under the de Sitter group O(1,4) or (2) invariant under one of its maximal...
The SU(5) potential in desitter space (1985)
The one-loop effective potential for a minimal SU(5) theory is calculated on a curved DeSitter background spacetime. The stability of its extrema in the following subgroups is investigated: SU(4) ×...
The SU(5) potential in desitter space (1985)
The one-loop effective potential for a minimal SU(5) theory is calculated on a curved DeSitter background spacetime. The stability of its extrema in the following subgroups is investigated: SU(4) ×...
The SU(5) potential in desitter space (1985)
The one-loop effective potential for a minimal SU(5) theory is calculated on a curved DeSitter background spacetime. The stability of its extrema in the following subgroups is investigated: SU(4) ×...
Euclidean Schwarzschild negative mode (1984)
The Euclidean (imaginary time) Schwarzschild solution of general relativity is known to possess a spin-2 metric perturbation which decreases its Euclidean action. This "negative mode" contributes an...
Phase transitions in De Sitter space (1983)
This paper uses zeta-function regularisation to calculate the one-loop functional determinants for fields of any spin in De Sitter space. As an example, we investigate the Coleman-Weinberg...
Vacuum energy in gauged extended supergravity (1983)
The one loop vacuum energy in gauged extended supergravity is calculated in anti de Sitter space using zeta function regularisation. It vanishes for N greater-or-equal, slanted 5. The energy zeta...
Phase transitions in De Sitter space (1983)
This paper uses zeta-function regularisation to calculate the one-loop functional determinants for fields of any spin in De Sitter space. As an example, we investigate the Coleman-Weinberg...
Phase transitions in De Sitter space (1983)
This paper uses zeta-function regularisation to calculate the one-loop functional determinants for fields of any spin in De Sitter space. As an example, we investigate the Coleman-Weinberg...
Assessing screening mammography utilization in an urban area.
Allen, Bruce, Bastani, Roshan, Bazargan, Shahrzad, Leonard, Earl
This study was conducted to determine the predictors of screening mammography among women 40 years old and older residing in South Central Los Angeles, California. The population is predominately...
Evaluating a tailored intervention to increase screening mammography in an urban area.
Allen, Bruce, Bazargan-Hejazi, Shahrzad
METHOD: The study was conducted over a four-year period, 1996 and 2000. Participants were recruited using Computer Assisted Telephone Interviewing (CATI) software and random-digit dialing (RDD)....
Exploiting global correlations to detect continuous gravitational waves
Pletsch, Holger J., Allen, Bruce
Fully coherent searches (over realistic ranges of parameter space and year-long observation times) for unknown sources of continuous gravitational waves are computationally prohibitive. Less...