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Compensated Isocurvature Perturbations and the Cosmic Microwave Background
Compensated Isocurvature Perturbations Microwave Background
2011/10/19
Measurements of cosmic microwave background (CMB) anisotropies constrain isocurvature fluctuations between photons and non-relativistic particles to be sub-dominant to adiabatic fluctuations. Perturba...
Ultra High Energy Comic Rays in the Cosmic Microwave Background
Ultra High Energy Comic Rays Cosmic Microwave Background
2011/10/13
We consider the propagation of ultra high energy cosmic rays (UHECR), for energies greater than E > 10^{14} eV but less than E < 10^{26} eV, in the cosmic medium of the Cosmic Microwave Background (CM...
Impacts of Dark Stars on Reionization and Signatures in the Cosmic Microwave Background
Impacts Dark Stars Reionization Signatures Cosmic
2011/9/30
We perform a detailed and systematic investigation of the possible impacts of dark stars upon the reionization history of the Universe, and its signatures in the cosmic microwave background (CMB). We ...
Observing the Big Bounce with Tensor Modes in the Cosmic Microwave Background: Phenomenology and Fundamental LQC Parameters
Tensor Modes the Cosmic Microwave Background
2010/12/24
Cosmological models where the standard big bang is replaced by a bounce have been studied for decades. The situation has, however, dramatically changed in the past years for two reasons: first, becaus...
Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings
Cosmic Microwave Background Radiation detecting cosmic strings
2010/12/27
In this paper we study the footprint of cosmic string as the topological defects in the very early universe on the cosmic microwave background radiation. We develop the method of level crossing analy...
Observing the Big Bounce with Tensor Modes in the Cosmic Microwave Background: Phenomenology and Fundamental LQC Parameters
Quantum gravity quantum cosmology
2010/12/21
Cosmological models where the standard Big Bang is replaced by a bounce have been studied for
decades. The situation has however dramatically changed in the last years for two reasons. First,because ...
Observing the Big Bounce with Tensor Modes in the Cosmic Microwave Background: Phenomenology and Fundamental LQC Parameters
Quantum gravity quantum cosmology
2010/11/12
Cosmological models where the standard Big Bang is replaced by a bounce have been studied for
decades. The situation has however dramatically changed in the last years for two reasons. First,because ...
Local non-Gaussianity in the Cosmic Microwave Background the Bayesian way
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
We introduce an exact Bayesian approach to search for non-Gaussianity of local type in Cosmic Microwave Background (CMB) radiation data. Using simulated CMB temperature maps, the newly developed techn...
Non-Gaussianity and the Cosmic Microwave Background Anisotropies
Non-Gaussianity Cosmic Microwave
2010/3/19
We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the Cosmic Microwave Background (CMB) anisotropies. We first show how to set the initial conditions at second...
Polarization in the Cosmic Microwave Background
Cosmic microwave background theory CMB observations
2010/9/29
Cosmic microwave background (CMB) studies underpin our understanding of the universe and its history. Until recently, we have relied principally on CMB temperature observations to build our standard c...