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28 papers · 2 filters
The last stand before MAP: cosmological parameters from lensing, CMB and galaxy clustering
Xiaomin Wang, Max Tegmark, Bhuvnesh Jain +1
Cosmic shear measurements have now improved to the point where they deserve to be treated on par with CMB and galaxy clustering data for cosmological parameter analysis, using the…
The end of unified dark matter?
Havard Sandvik, Max Tegmark, Matias Zaldarriaga +1
Despite the interest in dark matter and dark energy, it has never been shown that they are in fact two separate substances. We provide the first strong evidence that they are separ…
The overdensities of galaxy environments as a function of luminosity and color
David W. Hogg, Michael R. Blanton, Daniel J. Eisenstein +9
We study the mean environments of galaxies in the Sloan Digital Sky Survey as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in $8 h^{-…
Average spectra of massive galaxies in the SDSS
Daniel J. Eisenstein, David W. Hogg, Masataka Fukugita +17
We combine Sloan Digital Sky Survey spectra of 22,000 luminous, red, bulge-dominated galaxies to get high S/N average spectra in the rest-frame optical and ultraviolet (2600A to 70…
Probing the Friedmann equation during recombination with future CMB experiments
Oliver Zahn, Matias Zaldarriaga
We show that by combining measurements of the temperature and polarization anisotropies of the Cosmic Microwave Background (CMB), future experiments will tightly constrain the expa…
Air Shower Simulations in a Hybrid Approach using Cascade Equations
Hans-Joachim Drescher, Glennys R. Farrar
A new hybrid approach to air shower simulations is described. At highest energies, each particle is followed individually using the traditional Monte Carlo method; this initializes…