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On The Origin Of The Highest Redshift Gamma-Ray Bursts
Krzysztof Belczynski, Daniel E. Holz, Chris L. Fryer +3
GRB 080913 and GRB 090423 are the most distant gamma-ray bursts (GRBs) known to-date, with spectroscopically determined redshifts of z=6.7 and z=8.1, respectively. The detection of…
Measuring dark energy spatial inhomogeneity with supernova data
Asantha Cooray, Daniel E. Holz, Robert Caldwell
The gravitational lensing distortion of distant sources by the large-scale distribution of matter in the Universe has been extensively studied. In contrast, very little is known ab…
Implications of Two Type Ia Supernova Populations for Cosmological Measurements
Devdeep Sarkar, Alexandre Amblard, Asantha Cooray +1
Recent work suggests that Type Ia supernovae (SNe) are composed of two distinct populations: prompt and delayed. By explicitly incorporating properties of host galaxies, it may be…
Toward a halo mass function for precision cosmology: the limits of universality
Jeremy L Tinker, Andrey V Kravtsov, Anatoly Klypin +5
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<~2. Halos are i…