Strong gravitational lensing probes of the particle nature of dark matter (2009)
Moustakas, Leonidas A., Abazajian, Kevork, Benson, Andrew, Bolton, Adam S., Bullock, James S., Chen, Jacqueline, ...
There is a vast menagerie of plausible candidates for the constituents of dark matter, both within and beyond extensions of the Standard Model of particle physics. Each of these candidates may have...
Toward a halo mass function for precision cosmology: the limits of universality (2008)
Tinker, Jeremy L, Kravtsov, Andrey V, Klypin, Anatoly, Abazajian, Kevork, Warren, Michael S, Yepes, Gustavo, ...
We measure the mass function of dark matter halos in a large set of collisionless cosmological simulations of flat LCDM cosmology and investigate its evolution at z
Cosmological constraints from the SDSS luminous red galaxies (2006)
Tegmark, Max, Eisenstein, Daniel J., Strauss, Michael A., Weinberg, David H., Blanton, Michael R., Frieman, Joshua A., ...
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological...
Cosmological constraints from the SDSS Luminous Red Galaxies (2006)
Tegmark, Max, Eisenstein, Daniel, Strauss, Michael, Weinberg, David, Blanton, Michael, Frieman, Joshua, ...
Also archived in: arXiv:astro-ph/0608632 v2 Oct 30 2006
Constraints on Sterile Neutrino Dark Matter (2006)
Abazajian, Kevork, Koushiappas, Savvas M.
We present a comprehensive analysis of constraints on the sterile neutrino as a dark matter candidate. The minimal production scenario with a standard thermal history and negligible cosmological...
A Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy? (2006)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Kravtsov, Andrey V., Gnedin, Oleg Y., Abazajian, Kevork, ...
We use measurements of the stellar velocity dispersion profile of the Fornax dwarf spheroidal galaxy to derive constraints on its dark matter distribution. Though the data are unable to distinguish...
Berlind, Andreas A., Frieman, Joshua A., Weinberg, David H., Blanton, Michael R., Warren, Michael S., Abazajian, Kevork, ...
We identify galaxy groups and clusters in volume-limited samples of the SDSS redshift survey, using a redshift-space friends-of-friends algorithm. We optimize the friends-of-friends linking lengths...
Linear Cosmological Structure Limits on Warm Dark Matter (2005)
I consider constraints from observations on a cutoff scale in clustering due to free streaming of the dark matter in a warm dark matter cosmological model with a cosmological constant. The limits are...
Production and Evolution of Perturbations of Sterile Neutrino Dark Matter (2005)
Sterile neutrinos, fermions with no standard model couplings [SU(2) singlets], are predicted by most extensions of the standard model, and may be the dark matter. I describe the nonthermal production...
Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos (2005)
Abazajian, Kevork, Bell, Nicole F., Fuller, George M., Wong, Yvonne Y. Y.
We study post weak decoupling coherent active-sterile and active-active matter-enhanced neutrino flavor transformation in the early Universe. We show that flavor conversion efficiency at...
Parameterizing the Power Spectrum: Beyond the Truncated Taylor Expansion (2005)
Abazajian, Kevork, Kadota, Kenji, Stewart, Ewan D.
The power spectrum is traditionally parameterized by a truncated Taylor series: $ln P(k) = ln P_* + (n_*-1) ln(k/k_*) + {1/2} n'_* ln^2(k/k_*)$. It is reasonable to truncate the Taylor series if...
Precision Determination of the Mass Function of Dark Matter Halos (2005)
Warren, Michael S., Abazajian, Kevork, Holz, Daniel E., Teodoro, Luis
The predicted mass function of dark matter halos is essential in connecting observed galaxy cluster counts and models of galaxy clustering to the properties of the primordial density field. We...
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 Nonlinear Cosmological Matter Power Spectrum with Massive Neutrinos I: The Halo Model (2004)
Abazajian, Kevork, Switzer, Eric R., Dodelson, Scott, Heitmann, Katrin, Habib, Salman
Measurements of the linear power spectrum of galaxies have placed tight constraints on neutrino masses. We extend the framework of the halo model of cosmological nonlinear matter clustering to...
Cosmological Lepton Asymmetry, Primordial Nucleosynthesis, and Sterile Neutrinos (2004)
Abazajian, Kevork, Bell, Nicole F., Fuller, George M., Wong, Yvonne Y. Y.
We study post weak decoupling coherent active-sterile and active-active matter-enhanced neutrino flavor transformation in the early universe. We show that flavor conversion efficiency at...
Abazajian, Kevork, Zheng, Zheng, Zehavi, Idit, Weinberg, David H., Frieman, Joshua A., Berlind, Andreas A., ...
We use the projected correlation function w_p(r_p) of a volume-limited subsample of the Sloan Digital Sky Survey (SDSS) main galaxy redshift catalogue to measure the halo occupation distribution...
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 Cosmological Energy Density of Neutrinos from Oscillation Measurements (2003)
The emerging structure of the neutrino mass matrix, when combined with the primordial element abundances, places the most stringent constraint on the flavor asymmetries in the cosmological neutrino...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
Neutrino Mass and Dark Energy from Weak Lensing (2002)
Abazajian, Kevork, Dodelson, Scott
Weak gravitational lensing of background galaxies by intervening matter directly probes the mass distribution in the universe. This distribution, and its evolution at late times, is sensitive to both...
Testing the Cosmic Coincidence Problem and the Nature of Dark Energy (2001)
Dalal, Neal, Abazajian, Kevork, Jenkins, Elizabeth, Manohar, Aneesh V.
Dark energy models which alter the relative scaling behavior of dark energy and matter could provide a natural solution to the cosmic coincidence problem - why the densities of dark energy and dark...
Testing the Cosmic Coincidence Problem and the Nature of Dark Energy (2001)
Abazajian, Kevork, Dalal, Neal, Jenkins, Elizabeth, Manohar, Aneesh V.
Cosmological Constraints on Bulk Neutrinos (2000)
Abazajian, Kevork, Fuller, George M., Patel, Mitesh
Recent models invoking extra spacelike dimensions inhabited by (bulk) neutrinos are shown to have significant cosmological effects if the size of the largest extra dimension is R > 1 fm. We consider...
Pruet, Jason, Abazajian, Kevork, Fuller, George M.
We demonstrate a qualitatively new aspect of the dynamics of Gamma-Ray Burst (GRB) fireballs: the development of a substantial dispersion in the proton component in fireballs in which neutron...
Fuller, George M., Pruet, Jason, Abazajian, Kevork
We point out that the baryon-loading problem in Gamma-Ray Burst (GRB) models can be amelioriated if a significant fraction of the baryons which inertially confine the fireball are converted to...
Transformation-Induced Nonthermal Neutrino Spectra and Primordial Nucleosynthesis (1999)
Abazajian, Kevork, Shi, Xiangdong, Fuller, George M.
We examine in detail the changes in the production of primordial helium resulting from nonthermal neutrino momentum distributions produced by resonant transformation of electron-type neutrinos to...
Shi, Xiangdong, Fuller, George M., Abazajian, Kevork
This is a reply to the preprint "On Neutrino-Mixing-Generated Lepton Asymmetry and the Primordial Helium-4 Abundance" by M. V. Chizhov and D. P. Kirilova (hep-ph/9908525), which criticised our recent...
The Increase in the Primordial He-4 Yield in the Two-Doublet Four-Neutrino Mixing Scheme (1999)
Abazajian, Kevork, Fuller, George M., Shi, Xiangdong
We assess the effects on Big Bang Nucleosynthesis (BBN) of lepton number generation in the early universe resulting from the two-doublet four-neutrino mass/mixing scheme. It has been argued that this...
Neutrino-Mixing-Generated Lepton Asymmetry and the Primordial $^4$He Abundance (1999)
Shi, Xiangdong, Fuller, George M., Abazajian, Kevork
It has been proposed that an asymmetry in the electron neutrino sector may be generated by resonant active-sterile neutrino transformations during Big Bang Nucleosynthesis (BBN). We calculate the...
Active-Sterile Neutrino Mixing in the Early Universe and Primordial Nucleosynthesis (1999)
Abazajian, Kevork, Shi, Xiangdong, Fuller, George M.
We investigate the effects of matter-enhanced (MSW) transformation of neutrinos in the Early Universe on the primordial helium yield (Y_p). We find that Y_p is affected much more by the MSW-induced...
Are Gamma-Ray Bursts Signals of Supermassive Black Hole Formation? (1998)
Abazajian, Kevork, Fuller, George M., Shi, Xiangdong
The formation of supermassive black holes through the gravitational collapse of supermassive objects ($M \ga 10^4 M_\odot$) has been proposed as a source of cosmological gamma-ray bursts. The major...
Baryon/anti-baryon inhomogeneity and big bang nucleosynthesis (1998)
Abazajian, Kevork, Fuller, George M.
We investigate the effects of baryon/anti-baryon inhomogeneity on primordial nucleosynthesis. Recent work claims that electroweak baryogenesis could give rise to distinct regions of net baryon and...
The Third Data Release of the Sloan Digital Sky Survey (1998)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S.
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 degrees...