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- Lawrence Berkeley National LaboratoryUS199 papers
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7 papers · 2 filters
The Proximity Effect of QSO Metal Line Absorption Systems on Lyman Forests
Xiangdong Shi
The proximity effect of metal line absorption systems in spectra of high redshift quasars and quasar pairs is investigated through the distribution of \Lyalpha forests. No strong p…
Microlensing By a Prolate All-Macho Halo
Gilbert P. Holder, Lawrence M. Widrow
It is widely believed that dark matter halos are flattened, that is closer to oblate than prolate. The evidence cited is based largely on observations of galaxies which do not look…
Distribution of Gamma-Ray Bursts in Halo Neutron Star-Comet Models
M. G. Higgins, R. N. Henriksen
The motions of comets and neutron stars have been integrated over five billion years in the Galactic potential to determine a gamma-ray burst distribution, presuming that bursts ar…
Measuring Hubble's Constant in our Inhomogeneous Universe
Xiangdong Shi, Lawrence M. Widrow, L. Jonathan Dursi
Recent observations of Cepheids in the Virgo cluster have bolstered the evidence that supports a Hubble constant in 70-90 km/s/Mpc range. This evidence, by and large, probes the ex…
Large Scale Structure Tests of Warm Dark Matter
Stephane Colombi, Scott Dodelson, Lawrence M. Widrow
Warm dark matter (WDM) is an intriguing model of structure formation from the point of view of both cosmology and particle physics. We consider a one-parameter family of WDM models…
A Warm-Plus-Hot Dark Matter Universe
R. A. Malaney, G. D. Starkman, L. Widrow
We investigate a new hybrid-model universe containing two types of dark matter, one ``warm'' and the other ``hot''. The hot component is an ordinary light neutrino with mass $\sim…