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Observational Constraints on General Relativistic Energy Conditions, Cosmic Matter Density and Dark Energy from X-Ray Clusters of Galaxies and Type-Ia Supernovae
Peter Schuecker, Robert R. Caldwell, Hans Böhringer +3
New observational constraints on the cosmic matter density and an effectively redshift-independent equation of state parameter of the dark energy are obtained while sim…
Determining the Gamma-Ray Burst Rate as a Function of Redshift
Nevin Weinberg, Carlo Graziani, Donald Q. Lamb
We exploit the 14 gamma-ray bursts (GRBs) with known redshifts and the 7 GRBs for which there are constraints on to determine the GRB rate , using a method…
Constraining dark energy from the abundance of weak gravitational lenses
Nevin N. Weinberg, Marc Kamionkowski
We examine the prospect of using the observed abundance of weak gravitational lenses to constrain the equation-of-state parameter w of the dark energy. Here we solve the spherical-…
Weak Gravitational Lensing by Dark Clusters
Nevin N. Weinberg, Marc Kamionkowski
We calculate the abundance of dark-matter concentrations that are sufficiently overdense to produce a detectable weak-gravitational-lensing signal. Most of these overdensities are…