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The bias of galaxies and the density of the universe from the 2dF galaxy redshift survey
Licia Verde, Alan F. Heavens, Will J. Percival +1
By studying the bispectrum of the galaxy distribution in the 2dF galaxy redhsift survey (2dFGRS), we have shown that 2dFGRS galaxies are unbiased tracers of the mass distribution.…
Dark energy effects on the Lyman-alpha forest
M. Viel, S. Matarrese, Tom Theuns +2
In quintessence models, the dark energy content of the universe is described by a slowly rolling scalar field whose pressure and energy density obey an equation of state of the for…
Detecting X-ray filaments in the low redshift Universe with XEUS and Constellation-X
M. Viel, E. Branchini, R. Cen +3
We propose a possible way to detect baryons at low redshifts from the analysis of X-ray absorption spectra of bright AGN pairs. A simple semi-analytical model to simulate the spect…
Second-Order Cosmological Perturbations from Inflation
V. Acquaviva, N. Bartolo, S. Matarrese +1
We present the first computation of the cosmological perturbations generated during inflation up to second order in deviations from the homogeneous background solution. Our results…
Non-Gaussian Signatures in the Cosmic Background Radiation from Warm Inflation
S. Gupta, A. Berera, A. F. Heavens +1
We calculate the bispectrum of the gravitational field fluctuations generated during warm inflation, where dissipation of the vacuum potential during inflation is the mechanism for…
An Observational Test of Two-field Inflation
David Wands, Nicola Bartolo, Sabino Matarrese +1
We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent c…