The Sloan Digital Sky Survey-II: Photometry and Supernova Ia Light Curves from the 2005 data (2009)
Holtzman, Jon A., Marriner, John, Kessler, Richard, Sako, Masao, Dilday, Ben, Frieman, Joshua A., ...
We present ugriz light curves for 146 spectroscopically confirmed or spectroscopically probable Type Ia supernovae from the 2005 season of the SDSS-II Supernova survey. The light curves have been...
The Seventh Data Release of the Sloan Digital Sky Survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes...
Holographic Noise in Interferometers (2009)
General arguments based on black hole evaporation, and on particular interpretations of holographicGeneral arguments based on black hole evaporation, and on a particular interpretation of holographic...
Harmonic Gravitational Wave Spectra of Cosmic String Loops in the Galaxy (2009)
DePies, Matthew R, Hogan, Craig J
A new candidate source of gravitational radiation is described: the nearly-perfect harmonic series from individual loops of cosmic string. It is argued that theories with light cosmic strings give...
The seventh data release of the sloan digital sky survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
Holographic Geometry and Noise in Matrix Theory (2008)
Hogan, Craig J., Jackson, Mark G.
Using Matrix Theory as a concrete example of a fundamental holographic theory, we show that the emergent macroscopic spacetime displays a new macroscopic quantum structure, holographic geometry, and...
Indeterminacy of Holographic Quantum Geometry (2008)
An effective theory based on wave optics is used to describe indeterminacy of position in holographic spacetime with a UV cutoff at the Planck scale. Wavefunctions describing spacetime positions are...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Prieto, Carlos Allende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
First-Year Spectroscopy for the SDSS-II Supernova Survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of...
The sloan digital sky survey-II supernova survey: technical summary (2008)
Frieman, Joshua A., Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, ...
First-year spectroscopy for the sloan digital sky survey - II. Supernova survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the sloan digital sky survey (2008)
Adelman-McCarthy, Jennifer K., Agüros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S. J., Anderson, Scott F., ...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Measurement of Quantum Fluctuations in Geometry (2007)
A particular form for the quantum indeterminacy of relative spacetime position of events is derived from the limits of measurement possible with Planck wavelength radiation. The indeterminacy...
MacLeod, Chelsea L., Hogan, Craig J.
Measured gravitational waveforms from black hole binary inspiral events directly determine absolute luminosity distances. To use these data for cosmology, it is necessary to independently obtain...
Quantum Indeterminacy of Emergent Spacetime (2007)
It is shown that nearly-flat 3+1D spacetime emerging from a dual quantum field theory in 2+1D displays quantum fluctuations from classical Euclidean geometry on macroscopic scales. A covariant...
The New Science of Gravitational Waves (2007)
A brief survey is presented of new science that will emerge during the decades ahead from direct detection of gravitational radiation. Interferometers on earth and in space will probe the universe in...
Holographic Indeterminacy, Uncertainty and Noise (2007)
A theory is developed to describe the nonlocal effect of spacetime quantization on position measurements transverse to macroscopic separations. Spacetime quantum states close to a classical null...
Spacetime Indeterminacy and Holographic Noise (2007)
A new kind of quantum indeterminacy of transverse position is shown to arise from quantum degrees of freedom of spacetime, based on the assumption that classical trajectories can be defined no better...
Quantum Gravitational Uncertainty of Transverse Position (2007)
It is argued that holographic bounds on the information content of spacetime might be directly measurable. A new uncertainty principle is conjectured to arise from quantum indeterminacy of nearly...
White Noise from Dark Matter: 21 cm Observations of Early Baryon Collapse (2007)
Zurek, Kathryn M., Hogan, Craig J.
In concordance cosmology, dark matter density perturbations generated by inflation lead to nonlinear, virialized minihalos, into which baryons collapse at redshift $z \sim 20$. We survey here novel...
A New Spin on Quantum Gravity (2007)
Jackson, Mark G., Hogan, Craig J.
We suggest that the (small but nonvanishing) cosmological constant, and the holographic properties of gravitational entropy, may both reflect unconventional quantum spin-statistics at a fundamental...
Stochastic Gravitational Wave Background from Light Cosmic Strings (2007)
DePies, Matthew R., Hogan, Craig J.
Spectra of the stochastic gravitational wave backgrounds from cosmic strings are calculated and compared with present and future experimental limits. Background spectra are calculated numerically for...
The fifth data release of the sloan digital sky survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
Gravitational Wave Sources from New Physics (2006)
Forthcoming advances in direct gravitational wave detection from kilohertz to nanohertz frequencies have unique capabilities to detect signatures from or set meaningful constraints on a wide range of...
Astrophysical Effects of Scalar Dark Matter Miniclusters (2006)
Zurek, Kathryn M., Hogan, Craig J., Quinn, Thomas R.
We model the formation, evolution and astrophysical effects of dark compact Scalar Miniclusters (``ScaMs''). These objects arise when a scalar field, with an axion-like or Higgs-like potential,...
Gravitational Waves from Light Cosmic Strings: Backgrounds and Bursts with Large Loops (2006)
The mean spectrum and burst statistics of gravitational waves produced by a cosmological population of cosmic string loops are estimated using analytic approximations, calibrated with earlier...
Hubble Imaging Excludes Cosmic String Lens (2006)
Agol, Eric, Hogan, Craig J., Plotkin, Richard M.
The galaxy image pair CSL-1 has been a leading candidate for a cosmic string lens. High quality imaging data from the Hubble Space Telescope presented here show that it is not a lens but a pair of...
Nuclear Astrophysics of Worlds in the String Landscape (2006)
Motivated by landscape models in string theory, cosmic nuclear evolution is analyzed allowing the Standard Model Higgs expectation value w to take values different from that in our world (w=1), while...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fourth Data Release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
Discrete Quantum Spectrum of Observable Correlations from Inflation (2005)
The decoherence of quantum fluctuations into classical perturbations during inflation is discussed. A simple quantum mechanical argument, using a spatial particle wavefunction rather than a field...
The third data release of the sloan digital sky survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg2,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
Quarks, Electrons, and Atoms in Closely Related Universes (2004)
In a model where a multiverse wavefunction explores a multitude of vacua with different symmetries and parameters, properties of universes closely related to ours can be understood by examining the...
Holographic Bound on Information in Inflationary Perturbations (2004)
The formation of frozen classical perturbations from vacuum quantum fluctuations during inflation is described as a unitary quantum process with apparent "decoherence" caused by the expanding...
A Strategy for Finding Near Earth Objects with the SDSS Telescope (2004)
Raymond, Sean N., Fraser, Oliver J., Garg, Arti, Hawley, Suzanne L., Jedicke, Robert, Miknaitis, Gajus, ...
We present a detailed observational strategy for finding Near Earth Objects (NEOs) with the Sloan Digital Sky Survey (SDSS) telescope. We investigate strategies in normal, unbinned mode as well as...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt, Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
Discrete Spectrum of Inflationary Fluctuations (2003)
It is conjectured that inflation, taking account of quantum gravity, leads to a discrete spectrum of cosmological perturbations, instead of the continuous Gaussian spectrum predicted by standard...
Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae (2003)
Williams, Benjamin F., Hogan, Craig J., Barris, Brian, Candia, Pablo, Challis, Peter, Clocchiatti, Alejandro, ...
We present the results of a study of the host galaxies of high redshift Type Ia supernovae (SNe Ia). We provide a catalog of 18 hosts of SNe Ia observed with the Hubble Space Telescope (HST) by the...
Information from the Beginning (2002)
Requiring black hole evaporation to be quantum-mechanically coherent imposes a universal, finite ``holographic bound'', conjectured to be due to fundamental discreteness of quantized gravity, on the...
Holographic Discreteness of Inflationary Perturbations (2002)
The holographic entropy bound is used to estimate the quantum-gravitational discreteness of inflationary perturbations. In the context of scalar inflaton perturbations produced during standard...
Observing Quanta on a Cosmic Scale (2002)
Our entire galaxy, like all others, originated as a fairly smooth patch of binding energy, which in turn originated as a single quantum perturbation of the inflaton field on a subatomic scale during...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, Chirs, Lupton, Rpbert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francsico J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Sloan Digital Sky Survey: Early Data Release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francisco J., ...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
Sloan Digital Sky Survey: early data release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott M., Castander, Francisco J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈ 106 galaxies,...
New physics and astronomy with the new gravitational-wave observatories (2001)
Hughes, Scott A., Marka, Szabolcs, Bender, Peter L., Hogan, Craig J.
Gravitational-wave detectors with sensitivities sufficient to measure the radiation from astrophysical sources are rapidly coming into existence. By the end of this decade, there will exist several...
Estimating Stochastic Gravitational Wave Backgrounds with Sagnac Calibration (2001)
Hogan, Craig J., Bender, Peter L.
Armstrong et al. have recently presented new ways of combining signals to precisely cancel laser frequency noise in spaceborne interferometric gravitational wave detectors such as LISA. One of these...
Unified theories suggest that space is intrinsically 10 dimensional, even though everyday phenomena seem to take place in only 3 large dimensions. In ``Brane World'' models, matter and radiation are...
Particle Annihilation in Cold Dark Matter Micropancakes (2001)
Cold primordial particle dark matter forms with a distribution in six-dimensional phase space closely approximating a three-dimensional sheet. Folds in the mapping of this sheet onto configuration...
Scales of the Extra Dimensions and their Gravitational Wave Backgrounds (2000)
Circumstances are described in which symmetry breaking during the formation of our three-dimensional brane within a higher-dimensional space in the early universe excites mesoscopic classical radion...
Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2 (2000)
Coil, Alison L., Matheson, Thomas, Filippenko, Alexei V., Leonard, Douglas C., Tonry, John, Riess, Adam G., ...
We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0.455 and SN 1999fv...
Generation of Cosmic Magnetic Fields at Recombination (2000)
It is shown that the standard cosmological model predicts {\it ab initio} generation of large-scale but very small-amplitude cosmic magnetic fields at the epoch of recombination of the primeval...
Gravitational Waves from Mesoscopic Dynamics of the Extra Dimensions (2000)
Recent models which describe our world as a brane embedded in a higher dimensional space introduce new geometrical degrees of freedom: the shape and/or size of the extra dimensions, and the position...
Dalcanton, Julianne J., Hogan, Craig J.
We explore observed dynamical trends in a wide range of dark matter dominated systems (about seven orders of magnitude in mass) to constrain hypothetical dark matter candidates and scenarios of...
New Dark Matter Physics: Clues from Halo Structure (2000)
Hogan, Craig J., Dalcanton, Julianne J.
We examine the effect of primordial dark matter velocity dispersion and/or particle self-interactions on the structure and stability of galaxy halos, especially with respect to the formation of...
Riess, Adam G., Filippenko, Alexei V., Liu, Michael C., Challis, Peter, Clocchiatti, Alejandro, Diercks, Alan, ...
We have measured the rest-frame B,V, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z=0.46), using HST and ground-based near-infrared detectors. A goal of this study...
Warm Dark Matter: Clues to Primordial Phase Density from the Structure of Galaxy Halos (1999)
The Cold Dark Matter paradigm successfully explains many phenomena on scales larger than galaxies, but seems to predict galaxy halos which are more centrally concentrated and have a lumpier...
A fair and complete accounting of cosmic baryons now appears possible, because most of them are in states which are either directly observable or reliably constrained by indirect arguments. More than...
Energy Flow in the Universe (1999)
A brief but broad survey is presented of the flows, forms and large-scale transformations of mass-energy in the universe, spanning a range of about twenty orders of magnitude (m_{Planck}/m_{proton})...
Measuring Omega Baryon from the Helium Lyman-Alpha Forest (1999)
Wadsley, James W., Hogan, Craig J., Anderson, Scott F.
A new method to extract Omega_b from high redshift intergalactic absorption is described, based on the distribution of HeII Ly-alpha optical depths in the voids in the ionization zone of quasars. A...
Why the Universe is Just So (1999)
Some properties of the world are fixed by physics derived from mathematical symmetries, while others are selected from an ensemble of possibilities. Several successes and failures of ``anthropic''...
A Java Calculator of Standard Big Bang Nucleosynthesis (1999)
Mendoza, Luis, Hogan, Craig J.
A simple Java applet is presented which allows quick and easy computation and plotting of the predictions of light element abundances in SBBN, including errors in the predictions propagated from...
The Full Re-Ionization of Helium (1998)
Wadsley, James W., Hogan, Craig J., Anderson, Scott F.
Observations of resolved HeII Lyman alpha absorption in spectra of two QSO's suggest that the epoch of helium ionization occurred at z~3. Proximity zones in the spectra of the quasars (z=3.18, 3.285)...
Gravitational Lensing by Cold Dark Matter Catastrophes (1998)
Intrinsically cold particle dark matter inevitably creates halos with sharp discontinuities in projected surface density caused by the projection of fold catastrophes onto the sky. In principle,...
Cosmological Gravitational Wave Backgrounds (1998)
An overview is presented of possible cosmologically distant sources of gravitational wave backgrounds, especially those which might produce detectable backgrounds in the LISA band between 0.1 and 100...
Mapping Low-Density Intergalactic Gas: a Third Helium Lyman-alpha Forest (1998)
Anderson, Scott F., Hogan, Craig J., Williams, Benjamin F., Carswell, Robert F.
We present a new HST/STIS spectrum of the z=3.18 quasar PKS 1935-692 and summarize the spectral features shortwards of 304A in the rest frame likely to be caused by foreground HeII Lyman-alpha...
Riess, Adam G., Filippenko, Alexei V., Challis, Peter, Clocchiattia, Alejandro, Diercks, Alan, Garnavich, Peter M., ...
We present observations of 10 type Ia supernovae (SNe Ia) between 0.16 < z < 0.62. With previous data from our High-Z Supernova Search Team, this expanded set of 16 high-redshift supernovae and 34...
Estimates of the deuterium abundance in quasar absorbers are reviewed, including a brief account of incorrect claims published by the author and a brief review of the problem of hydrogen...
A Bayesian Estimate of the Primordial Helium Abundance (1997)
Hogan, Craig J., Olive, Keith A., Scully, Sean T.
We introduce a new statistical method to estimate the primordial helium abundance, Y_p from observed abundances in a sample of galaxies which have experienced stellar helium enrichment. Rather than...
Statistical Measurement of Primordial Deuterium Abundance (1997)
Rugers, Martin H., Hogan, Craig J.
Lyman series absorption features and corresponding metal lines in three high-resolution quasar spectra are fitted in the standard way with thermally broadened discrete redshift components. A...
Spectra of quasars at high redshift with high resolution and high signal-to-noise allow in favorable circumstances detection of absorption by deuterium and ultimately measurement of its primordial...
Hogan, Craig J., Anderson, Scott F., Rugers, Martin H.
We present a new, high resolution HST/GHRS spectrum of quasar Q0302-003, and use the HeII Lyman-$\alpha$ absorption, together with a high resolution Keck spectrum of the HI Lyman-$\alpha$ forest, to...
Big Bang Nucleosynthesis and the Observed Abundances of Light Elements (1996)
The predictions of Standard Big Bang Nucleosynthesis are summarized and compared with observations of abundances of helium in HII regions, deuterium in quasar absorbers, deuterium and helium-3 in the...
High Deuterium Abundance in a New Quasar Absorber (1996)
Rugers, Martin, Hogan, Craig J.
We present a new analysis of an absorption system in the spectrum of Q0014+813, with particular attention to a single cold cloud at redshift $z=2.797957$. Features are identified at this redshift...
Cosmic Deuterium and Baryon Density (1995)
Quasar absorption lines now permit a direct probe of deuterium abundances in primordial material, with the best current estimate $ (D/H)=1.9\pm 0.4 \times 10^{-4}$. If this is the universal...
Cosmic Fluctuations and Dark Matter from Scalar Field Oscillations (1994)
Scale-invariant fluctuations and cold dark matter could originate from two different modes of a single scalar field, fluctuations from massless Goldstone oscillations and matter from massive Higgs...
Primordial Deuterium Abundance and Cosmic Baryon Density (1994)
The comparison of cosmic abundances of the light elements with the density of baryonic stars and gas in the universe today provides a critical test of big bang theory and a powerful probe of the...
Giant Branch Mixing and the Ultimate Fate of Primordial Deuterium in the Galaxy (1994)
The observed cosmic abundances of light elements are most consistent with each other, and with the predictions of big bang nucleosynthesis,if, contrary to the usual assumption, galactic chemical...