Vallinotto, Alberto, Viel, Matteo, Das, Sudeep, Spergel, David N.
We expect a detectable correlation between two seemingly unrelated quantities: the four point function of the cosmic microwave background (CMB) and the amplitude of flux decrements in quasar (QSO)...
Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample (2009)
Percival, Will J., Reid, Beth A., Eisenstein, Daniel J., Bahcall, Neta A., Budavari, Tamas, Frieman, Joshua A., ...
The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample represents the final set of galaxies observed using the original SDSS target selection criteria. We analyse the...
Reid, Beth A., Percival, Will J., Eisenstein, Daniel J., Verde, Licia, Spergel, David N., Skibba, Ramin A., ...
We present the power spectrum of the reconstructed halo density field derived from a sample of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey Seventh Data Release (DR7). The halo...
N. Jeremy Kasdin, Robert J. Vanderbei, David N. Spergel, Michael G. Littman
In this paper we examine several different apodization approaches to achieving high-contrast imaging of extrasolar planets and compare different designs on a selection of performance metrics. These...
Checkerboard-Mask Coronagraphs for High-Contrast Imaging (2009)
Robert J. Vanderbei, N. Jeremy Kasdin, David N. Spergel
We present yet another new family of masks for high-contrast imaging as required for the to-be-built terrestrial planet finder space telescope. We call these masks checkerboard masks. They consist of...
Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing (2009)
Vallinotto, Alberto, Das, Sudeep, Spergel, David N., Viel, Matteo
We present a theoretical estimate for a new observable: the cross-correlation between the Lyman-alpha flux fluctuations in quasar (QSO) spectra and the convergence of the cosmic microwave background...
Southern Cosmology Survey III: QSO's from Combined GALEX and Optical Photometry (2008)
Jimenez, Raul, Spergel, David N., Niemack, Michael D., Menanteau, Felipe, Hughes, John P., Verde, Licia, ...
We present catalogs of QSO candidates selected using photometry from GALEX combined with SDSS in the Stripe 82 region and Blanco Cosmology Survey (BCS) near declination -55 degrees. The SDSS region...
Reid, Beth A., Spergel, David N., Bode, Paul
The complex relationship between the galaxy density field and the underlying matter field limits our ability to extract cosmological constraints from galaxy redshift surveys. Our approach is to use...
Double Binary Pulsar Test of Dynamical Chern-Simons Modified Gravity (2008)
Yunes, Nicolas, Spergel, David N.
Gravitational parity violation is inherent in string theory, one effective model of which is Chern-Simons modified gravity. This effective theory introduces a parity-violating modification to the...
Measuring Distance Ratios with CMB-Galaxy Lensing Cross-correlations (2008)
Das, Sudeep, Spergel, David N.
We propose a method for cosmographic measurements by combining gravitational lensing of the cosmic microwave background (CMB) with cosmic shear surveys. We cross-correlate the galaxy counts in the...
CMB Lensing and the WMAP Cold Spot (2008)
Das, Sudeep, Spergel, David N.
Cosmologists have suggested a number of intriguing hypotheses for the origin of the "WMAP cold spot", the coldest extended region seen in the CMB sky, including a very large void and a collapsing...
Constraining the LRG Halo Occupation Distribution using Counts-in-Cylinders (2008)
Reid, Beth A., Spergel, David N.
The low number density of the Sloan Digital Sky Survey (SDSS) Luminous Red Galaxies (LRGs) suggests that LRGs occupying the same dark matter halo can be separated from pairs occupying distinct dark...
Efficient Power Spectrum Estimation for High Resolution CMB Maps (2008)
Das, Sudeep, Hajian, Amir, Spergel, David N.
Estimation of the angular power spectrum of the Cosmic Microwave Background (CMB) on a small patch of sky is usually plagued by serious spectral leakage, specially when the map has a hard edge. Even...
Next Generation Redshift Surveys and the Origin of Cosmic Acceleration (2008)
Acquaviva, Viviana, Hajian, Amir, Spergel, David N., Das, Sudeep
Cosmologists are exploring two possible sets of explanations for the remarkable observation of cosmic acceleration: dark energy fills space or general relativity fails on cosmological scales. We...
On The Eigenmodes Of Compact Hyperbolic 3-Manifolds (2007)
Neil J. Cornish, David N. Spergel
. We present a simple algorithm for finding eigenmodes of the Laplacian for arbitrary compact hyperbolic 3-manifolds. We apply our algorithm to a sample of twelve manifolds and generate a list of the...
Maki Suginohara, Tatsushi Suginohara, David N. Spergel
Density inhomogeneities along the line-of-sight distort fluctuations in the cosmic microwave background. Usually, this effect is thought of as a small second-order effect that mildly alters the...
Towards a Three-Dimensional Model of the Galaxy (2007)
David N. Spergel, Sangeeta Malhotra, Leo Blitz
We present preliminary results of our modelling of the J, K, L and M band emission detected by the DIRBE instrument on the COBE satellite. Our model includes the contribution of Zodiacal light and a...
Detecting Objects, Through Carbon, Maki Suginohara, Tatsushi Suginohara, David N. Spergel
By redshift of 10, star formation in the first objects should have produced considerable amounts of Carbon, Nitrogen and Oxygen. The submillimeter lines of C, N and O redshift into the millimeter and...
Cosmic Microwave Anisotropies from Topological Defects in an Open Universe (2007)
We present a general formalism for computing Cosmic Background Radiation (CBR) and density fluctuations in open models with stiff sources. We decompose both the metric fluctuations and the...
Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings (2007)
Fraisse, Aurélien A., Ringeval, Christophe, Spergel, David N., Bouchet, François R.
We use Nambu-Goto numerical simulations to compute the cosmic microwave background (CMB) temperature anisotropies induced at arcminute angular scales by a network of cosmic strings in a...
Evidence for short-lived SN Ia progenitors (2007)
Aubourg, Eric, Tojeiro, Rita, Jimenez, Raul, Heavens, Alan F., Strauss, Michael A., Spergel, David N.
We use the VESPA algorithm and spectra from the Sloan Digital Sky Survey to investigate the star formation history of the host galaxies of 257 Type Ia supernovae. We find 5$\sigma$ evidence for a...
The Co-Formation of Spheroids and Quasars Traced in their Clustering (2006)
Hopkins, Philip F., Lidz, Adam, Hernquist, Lars, Coil, Alison L., Myers, Adam D., Cox, Thomas J., ...
We compare observed clustering of quasars and galaxies as a function of redshift, mass, luminosity, & color/morphology, to constrain models of quasar fueling and spheroid-BH co-evolution. High...
Separating the Weak Lensing and Kinetic SZ Effects from CMB Temperature Maps (2006)
Riquelme, Mario A., Spergel, David N.
A new generation of CMB experiments will soon make sensitive high resolution maps of the microwave sky. At angular scales less than $\sim$10 arcminutes, most CMB anisotropies are generated at z $<...
Extending the WMAP Bound on the Size of the Universe (2006)
Key, Joey Shapiro, Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Clues to the shape of our Universe can be found by searching the CMB for matching circles of temperature patterns. A full sky search of the CMB, mapped extremely accurately by NASA's WMAP satellite,...
SZE Signals in Cluster Models (2006)
Reid, Beth A., Spergel, David N.
The upcoming generation of SZE surveys will shed fresh light onto the study of clusters. What will this new observational window reveal about cluster properties? What can we learn from combining...
The kinetic Sunyaev-Zel'dovitch effect as a dark energy probe (2005)
DeDeo, Simon, Spergel, David N., Trac, Hy
Upcoming observatories will be able to detect the kinetic Sunyaev-Zel'dovitch (kSZ) effect with unprecendented signal-to-noise, and cross-correlations with foreground signals such as galaxy counts...
Lithopanspermia in Star-Forming Clusters (2005)
Adams, Fred C., Spergel, David N.
This paper considers the lithopanspermia hypothesis in star-forming groups and clusters, where the chances of biological material spreading from one solar system to another is greatly enhanced...
Ishak, Mustapha, Upadhye, Amol, Spergel, David N.
If general relativity is the correct theory of physics on large scales, then there is a differential equation that relates the Hubble expansion function, inferred from measurements of angular...
Lithopanspermia in Star Forming Clusters (2005)
Adams, Fred C., Spergel, David N.
This paper considers the lithopanspermia hypothesis in star forming groups and clusters, where the chances of biological material spreading from one solar system to another is greatly enhanced...
Optimal Asymmetric Apodizations and Shaped Pupils for Planet Finding Coronagraphy (2004)
Kasdin, N. Jeremy, Vanderbei, Robert J., Littman, Michael G., Spergel, David N.
The realization that direct imaging of extrasolar planets could be technologically feasible within the next decade or so has inspired a great deal of recent research into high-contrast imaging. We...
Shear Selected Cluster Cosmology I: Tomography and Optimal Filtering (2004)
Hennawi, Joseph F., Spergel, David N.
We study the potential of weak lensing surveys to detect clusters of galaxies, using a fast Particle Mesh cosmological N-body simulation algorithm specifically tailored to investigate the statistics...
Rectangular-Mask Coronagraphs for High-Contrast Imaging (2004)
Vanderbei, Robert J., Kasdin, N. Jeremy, Spergel, David N.
We present yet another new family of masks for high-contrast imaging as required for the to-be-built terrestrial planet finder space telescope. The ``best'' design involves a square entrance pupil...
Constraining the Topology of the Universe (2003)
Cornish, Neil J., Spergel, David N., Starkman, Glenn D., Komatsu, Eiichiro
The first year data from the Wilkinson Microwave Anisotropy Probe are used to place stringent constraints on the topology of the Universe. We search for pairs of circles on the sky with similar...
Doré, Olivier, Hennawi, Joseph F., Spergel, David N.
Secondary anisotropies of the CMB have the potential to reveal intricate details about the history of our universe between the present and recombination epochs. However, because the CMB we observe is...
Measuring primordial non-Gaussianity in the cosmic microwave background (2003)
Komatsu, Eiichiro, Spergel, David N., Wandelt, Benjamin D.
We derive a fast way for measuring primordial non-Gaussianity in a nearly full-sky map of the cosmic microwave background. We find a cubic combination of sky maps combining bispectrum configurations...
Circularly Symmetric Apodization via Starshaped Masks (2003)
Vanderbei, Robert J., Spergel, David N., Kasdin, N. Jeremy
Recently, we introduced a class of shaped pupil masks, called spiderweb masks, that produce point spread functions having annular dark zones. With such masks, a single image can be used to probe a...
Spiderweb Masks for High-Contrast Imaging (2003)
Vanderbei, Robert J., Spergel, David N., Kasdin, N. Jeremy
Motivated by the desire to image exosolar planets, recent work by us and others has shown that high-contrast imaging can be achieved using specially shaped pupil masks. To date, the masks we have...
Notch Filter Masks: Practical Image Masks for Planet-Finding Coronagraphs (2002)
Kuchner, Marc J., Spergel, David N.
An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction...
Spergel, David N., Starkman, Glenn D.
Measurements of the flux and redshifts of Type Ia supernovae have provided persuasive evidence that the expansion of the universe is accelerating. If true, then in the context of standard FRW...
Journey to the edge of time: The GREAT mission (2002)
Cornish, Neil J., Spergel, David N., Bennett, Charles L.
We are surrounded by radiation that originated from the big bang. It has traveled to us from the farthest reaches of the Universe, carrying with it an unaltered record of the beginning of time and...
How Lumpy is the Milky Way's Dark Matter Halo? (2001)
Johnston, Kathryn V., Spergel, David N., Haydn, Christian
CDM simulations predict that there are hundreds of lumps of with masses greater than 10e7 solar masses in the Milky Way halo. However, we know of only a dozen dwarf satellites close to this mass. Are...
Predictions for the Counts of Faint, High-Redshift Galaxies in the Mid-Infrared (2001)
Haiman, Zoltan, Spergel, David N., Turner, Edwin L.
Deep mid-infrared (MIR) observations could reveal a population of faint, high-redshift (z>3) dusty starburst galaxies that are the progenitors of present-day spheroids or bulges, and are beyond the...
Dark energy and cosmic microwave background bispectrum (2001)
Verde, Licia, Spergel, David N.
We compute the cosmic microwave background bispectrum arising from the cross-correlation of primordial, lensing and Rees-Sciama signals. The amplitude of the bispectrum signal is sensitive to the...
Measurement of the cosmic microwave background bispectrum on the COBE DMR sky maps (2001)
Komatsu, Eiichiro, Wandelt, Benjamin D., Spergel, David N., Banday, Anthony J., Gorski, Krzysztof M.
We measure the angular bispectrum of the cosmic microwave background (CMB) radiation anisotropy from the COBE Differential Microwave Radiometer (DMR) four-year sky maps. The angular bispectrum is the...
Verde, Licia, Haiman, Zoltan, Spergel, David N.
An extensive sample of galaxy clusters will be available in the coming years, detected through their Sunyaev-Zeldovich effect (SZE). We use a semi-analytic model to study the scientific yield of...
Rayleigh Scattering and Microwave Background Fluctuations (2001)
Yu, Qingjuan, Spergel, David N., Ostriker, Jeremiah P.
During the recombination epoch, cosmic background photons couple not only to free electrons through Thompson scattering, but also to the neutral hydrogen through Rayleigh scattering. This latter is...
A New Pupil for Detecting Extrasolar Planets (2001)
The challenge for optical detection of terrestial planet is the 25 magnitude brightness contrast between the planet and its host star. This paper introduces a new pupil design that produces a very...
CMB anisotropy from spatial correlations of clusters of galaxies (2000)
Komatsu, Eiichiro, Kitayama, Tetsu, Refregier, Alexandre, Spergel, David N., Pen, Ue-Li
The SZ effect from clusters of galaxies is a dominant source of secondary CMB anisotropy in the low-redshift universe. We present analytic predictions for the CMB power spectrum from massive halos...
Komatsu, Eiichiro, Spergel, David N.
Why is non-Gaussianity interesting? One of generic predictions from inflationary scenarios is that primordial fluctuations are exactly Gaussian in linear order; however, the non-linearity in the...
Self-Interacting Dark Matter (2000)
Wandelt, Benjamin D., Dave, Romeel, Farrar, Glennys R., McGuire, Patrick C., Spergel, David N., Steinhardt, Paul J.
Spergel and Steinhardt have recently proposed the concept of dark matter with strong self-interactions as a means to address numerous discrepancies between observations of dark matter halos on...
Halo Properties in Cosmological Simulations of Self-Interacting Cold Dark Matter (2000)
Davé, Romeel, Spergel, David N., Steinhardt, Paul J., Wandelt, Benjamin D.
We present a comparison of halo properties in cosmological simulations of collisionless cold dark matter (CDM) and self-interacting dark matter (SIDM) for a range of dark matter cross sections. We...
Narayanan, Vijay K., Spergel, David N., Davé, Romeel, Ma, Chung-Pei
High resolution N-body simulations of cold dark matter (CDM) models predict that galaxies and clusters have cuspy halos with excessive substructure. Observations reveal smooth halos with central...
Acoustic Signatures in the Primary Microwave Background Bispectrum (2000)
Komatsu, Eiichiro, Spergel, David N.
If the primordial fluctuations are non-Gaussian, then this non-Gaussianity will be apparent in the cosmic microwave background (CMB) sky. With their sensitive all-sky observation, MAP and Planck...
Cross-correlating the Sloan Digital Sky Survey with the Microwave Sky (2000)
Peiris, Hiranya V., Spergel, David N.
While most of the microwave background fluctuations on angular scales greater than a few arcminutes were generated at z > 800, the low redshift universe does distort the microwave background. Since...
Using Perturbative Least Action to Recover Cosmological Initial Conditions (1999)
Goldberg, David M., Spergel, David N.
We introduce a new method for generating initial conditions consistent with highly nonlinear observations of density and velocity fields. Using a variant of the Least Action method, called...
Observational evidence for self-interacting cold dark matter (1999)
Spergel, David N., Steinhardt, Paul J.
Cosmological models with cold dark matter composed of weakly interacting particles predict overly dense cores in the centers of galaxies and clusters and an overly large number of halos within the...
A small universe after all? (1999)
Cornish, Neil J., Spergel, David N.
The cosmic microwave background radiation allows us to measure both the geometry and topology of the universe. It has been argued that the COBE-DMR data already rule out models that are multiply...
On the eigenmodes of compact hyperbolic 3-manifolds (1999)
Cornish, Neil J., Spergel, David N.
We present a simple algorithm for finding eigenmodes of the Laplacian for arbitrary compact hyperbolic 3-manifolds. We apply our algorithm to a sample of twelve manifolds and generate a list of the...
High Velocity Clouds: the Missing Link (1999)
Blitz, Leo, Spergel, David N., Teuben, Peter J., Hartman, Dap
Hierarchical structure formation models predict the existence of large numbers of low velocity dispersion dark halos. Galaxy surveys find far fewer galaxies than predicted by analytical estimates and...
Model-Independent Measurement of the Primordial Power Spectrum (1998)
Wang, Yun, Spergel, David N., Strauss, Michael A.
In inflationary models with minimal amount of gravity waves, the primordial power spectrum of density fluctuations, $A_S^2(k)$, together with the basic cosmological parameters, completely specify the...
Is the Dark Matter a Solid? (1998)
Bucher, Martin, Spergel, David N.
A smooth unclustered dark matter component with negative presure could reconcile a flat universe with the many observations that find a density in ordinary, clustered matter well below the critical...
The Microwave Background Bispectrum, Paper II: A Probe of the Low Redshift Universe (1998)
Goldberg, David M., Spergel, David N.
Gravitational fluctuations along the line-of-sight from the surface of last scatter to the observer distort the microwave background in several related ways: The fluctuations deflect the photon path...
The Microwave Background Bispectrum, Paper I: Basic Formalism (1998)
Spergel, David N., Goldberg, David M.
In this paper, we discuss the potential importance of measuring the CMB anisotropy bispectrum. We develop a formalism for computing the bispectrum and for measuring it from microwave background maps....
Tidal Streams as Probes of the Galactic Potential (1998)
Johnston, Kathryn V., Zhao, HongSheng, Spergel, David N., Hernquist, Lars
We explore the use of tidal streams from Galactic satellites to recover the potential of the Milky Way. Our study is motivated both by the discovery of the first lengthy stellar stream in the halo...
Oh, Siang Peng, Spergel, David N., Hinshaw, Gary
There is enormous potential to advance cosmology from statistical characterizations of cosmic microwave background sky maps. The angular power spectrum of the microwave anisotropy is a particularly...
High Velocity Clouds: Building Blocks of the Local Group (1998)
Blitz, Leo, Spergel, David N., Teuben, Peter J., Hartmann, Dap, Burton, W. Butler
We suggest that the high--velocity clouds (HVCs) are large clouds, with typical diameters of 25 kpc and containing 5e7 solar masses of neutral gas and 3e8 solar masses of dark matter, falling onto...
Detecting z > 10 objects through carbon, nitrogen and oxygen emission lines (1998)
Suginohara, Maki, Suginohara, Tatsushi, Spergel, David N.
By redshift of 10, star formation in the first objects should have produced considerable amounts of Carbon, Nitrogen and Oxygen. The submillimeter lines of C, N and O redshift into the millimeter and...
Wang, Yun, Spergel, David N., Strauss, Michael A.
The basic cosmological parameters and the primordial power spectrum together completely specify predictions for the cosmic microwave background radiation anisotropy and large scale structure. Here we...
Measuring the topology of the universe. (1998)
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Observations of microwave background fluctuations can yield information not only about the geometry of the universe but potentially about the topology of the universe. If the universe is negatively...
Yun Wang, David N. Spergel, Michael A. Strauss
The existence of primordial adiabatic Gaussian random-phase density fluctuations is a generic prediction of inflation. The properties of these fluctuations are completely specified by their power...
CMB Anisotropy Correlation Function and Topology from Simulated Maps for MAP (1997)
Park, Changbom, Colley, Wesley N., Gott III, J. Richard, Ratra, Bharat, Spergel, David N., Sugiyama, Naoshi
We have simulated cosmic microwave background (CMB) anisotropy maps for several COBE-DMR-normalized cold dark matter (CDM) cosmogonies, to make predictions for the upcoming MAP experiment. We have...
Measuring the Topology of the Universe (1997)
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Observations of microwave background fluctuations can yield information not only about the geometry of the universe, but potentially about the topology of the universe. If the universe is negatively...
Wang, Yun, Spergel, David N., Turner, Edwin L.
Low amplitude (linear regime) cosmic density fluctuations lead to spatial variations in the locally measurable value of $H_0$ (denoted as $H_L$), $\delta_H \equiv (H_L-H_0)/H_0$, which are of order...
CMB polarization as a direct test of Inflation (1997)
Spergel, David N., Zaldarriaga, Matias
We study the auto-correlation function of CMB polarization anisotropies and their cross correlation with temperature fluctuations as probe of the causal structure of the universe. Because...
Suginohara, Maki, Suginohara, Tatsushi, Spergel, David N.
Density inhomogeneities along the line-of-sight distort fluctuations in the cosmic microwave background. Usually, this effect is thought of as a small second-order effect that mildly alters the...
Cosmological-parameter determination with microwave background maps (1996)
Jungman, Gerard, Kamionkowski, Marc, Kosowsky, Arthur, Spergel, David N.
The angular power spectrum of the cosmic microwave background (CMB) contains information on virtually all cosmological parameters of interest, including the geometry of the Universe (Ω), the baryon...
Distinguishing Causal Seeds from Inflation (1996)
Hu, Wayne, Spergel, David N., White, Martin
Causal seed models, such as cosmological defects, generically predict a distinctly different structure to the CMB power spectrum than inflation, due to the behavior of the perturbations outside the...
Determining Cosmological Parameters from the Microwave Background (1996)
Kosowsky, Arthur, Kamionkowski, Marc, Jungman, Gerard, Spergel, David N.
Recently funded satellites will map the cosmic microwave background radiation with unprecedented sensitivities and angular resolutions. Assuming only primordial adiabatic scalar and tensor...
The Milky Way, The Local Galaxies \& the IR Tully-Fisher Relation (1996)
Malhotra, Sangeeta, Spergel, David N, Rhoads, James E, Li, Jing
Using the near infrared fluxes of local galaxies derived from COBE/DIRBE J(1.25 $\mu$m) K (2.2 $\mu$m) \& L (3.5 $\mu$m) band maps and published Cepheid distances, we construct Tully-Fisher (TF)...
Are Hubble Deep Field Galaxy Counts Whole Numbers? (1996)
Colley, Wesley N., Rhoads, James E., Ostriker, Jeremiah P., Spergel, David N.
We compute the two-point angular correlation function and number-magnitude relation of Hubble Deep Field sources in order to assess their nature. We find that the correlation peaks between 0.25...
Several lines of evidence suggest that some of the dark matter may be non-baryonic: the non-detection of various plausible baryonic candidates for dark matter inferred, e.g., from galaxy rotation...
Circles in the Sky: Finding Topology with the Microwave Background Radiation (1996)
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
If the universe is finite and smaller than the distance to the surface of last scatter, then the signature of the topology of the universe is writ on the microwave background sky. Previous efforts to...
Weighing the Universe with the Cosmic Microwave Background (1996)
Jungman, Gerard, Kamionkowski, Marc, Kosowsky, Arthur, Spergel, David N.
Variations in Ω, the total density of the Universe, leave an imprint on the power spectrum of temperature fluctuations in the cosmic microwave background (CMB). We evaluate the precision with which...
Does Chaotic Mixing Facilitate Omega (1996)
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Yes, if the universe has compact topology. Inflation is currently the most elegant explanation of why the universe is old, large, nearly flat, homogeneous on large scales and structured on small...
Future Cosmic Microwave Background Constraints to the Baryon Density (1996)
Kamionkowski, Marc, Jungman, Gerard, Kosowsky, Arthur, Spergel, David N.
We discuss what can be learned about the baryon density from an all-sky map of the cosmic microwave background (CMB) with sub-degree angular resolution. With only minimal assumptions about the...
Cosmological-Parameter Determination with Microwave Background Maps (1995)
Jungman, Gerard, Kamionkowski, Marc, Kosowsky, Arthur, Spergel, David N.
The angular power spectrum of the cosmic microwave background (CMB) contains information on virtually all cosmological parameters of interest, including the geometry of the Universe ($\Omega$), the...
Weighing the Universe with the Cosmic Microwave Background (1995)
Jungman, Gerard, Kamionkowski, Marc, Kosowsky, Arthur, Spergel, David N.
Variations in $\Omega$, the total density of the Universe, leave a clear and distinctive imprint on the power spectrum of temperature fluctuations in the cosmic microwave background (CMB). This...
The Disruption of the Sagittarius Dwarf Galaxy. (1995)
Johnston, Kathryn V., Spergel, David N., Hernquist, Lars
Numerical simulations of dwarf spheroidal galaxies undergoing several close encounters with the Milky Way are described. By comparing our models to observed properties of the recently discovered...
Microlensing by the Galactic Bar (1994)
Zhao, HongSheng, Spergel, David N., Rich, R. Michael
We compute the predicted optical depth and duration distribution of microlensing events towards Baade's window in a model composed of a Galactic disk and a bar. The bar model is a self-consistent...
A New Technique for Detecting Supersymmetric Dark Matter (1994)
Starkman, Glenn D., Spergel, David N.
We estimate the event rate for excitation of atomic transition by photino-like dark matter. For excitations of several eV, this event rate can exceed naive cross-section by many orders of magnitude....
Cosmic Microwave Anisotropies from Topological Defects in an Open Universe (1994)
We present a general formalism for computing Cosmic Background Radiation (CBR) and density fluctuations in open models with stiff sources. We find analytic Green's functions for the linearized...
CBR Anisotropy in an Open Inflation, CDM Cosmogony (1994)
Kamionkowski, Marc, Ratra, Bharat, Spergel, David N., Sugiyama, Naoshi
We compute the cosmic background radiation anisotropy, produced by energy-density fluctuations generated during an early epoch of inflation, in an open cosmological model based on the cold dark...
Microwave Background Fluctuations in an Open Universe (1994)
Spergel, David N., Pen, Ue-Li, Kamionkowski, Marc, Sugiyama, Naoshi
( to appear in: Proceedings of the Nishonomiya Yukawa Memorial Symposium Edited by M. Sasaki) There are several models for generating fluctuations in an open universe that are compatible with the...
Topological Defects in an Open Universe (1994)
(To appear in Nuclear Physics B Supplements Proceedings section) This talk will explore the evolution of topological defects in an open universe. The rapid expansion of the universe in an open model...
Kamionkowski, Marc, Spergel, David N., Sugiyama, Naoshi
We perform detailed calculations of cosmic microwave background (CMB) anisotropies in a CDM-dominated open universe with primordial adiabatic density perturbations for a variety of reionization...
Large-Angle Cosmic Microwave Background Anisotropies in an Open Universe (1993)
Kamionkowski, Marc, Spergel, David N.
If the Universe is open, scales larger than the curvature scale may be probed by large-angle fluctuations in the cosmic microwave background (CMB). We consider primordial adiabatic perturbations and...
Is Large Lepton Mixing Excluded? (1993)
Smirnov, Alexei Yu., Spergel, David N., Bahcall, John N.
The original \bnum -(or $\bar{\nu}_{\tau}$-) energy spectrum from the gravitational collapse of a star has a larger average energy than the spectrum for \bnue since the opacity of \bnue exeeds that...
The astrophysical implications of weakly interacting, massive particles / (1985)
Thesis (Ph. D.)--Harvard University, 1985.
The astrophysical implications of weakly interacting, massive particles [microform] / (1985)
Thesis (Ph. D.)--Harvard University, 1985.
Measuring the topology of the universe
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Observations of microwave background fluctuations can yield information not only about the geometry of the universe but potentially about the topology of the universe. If the universe is negatively...
Measuring the topology of the universe
Cornish, Neil J., Spergel, David N., Starkman, Glenn D.
Observations of microwave background fluctuations can yield information not only about the geometry of the universe but potentially about the topology of the universe. If the universe is negatively...