Evolution of Cosmological Perturbations in the Presence of Primordial Magnetic Fields - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Evolution of Cosmological Perturbations in the Presence of Primordial Magnetic Fields - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Possible existence of the primordial magnetic fields has affected thestructure formation of the universe. In this paper it is shown that the initialconditions for density perturbations with magnetic fields derived in previousworks are inconsistent with Einstein equations. We find that this inconsistencyarises due to the unwanted cancellation of contributions from the magneticfields and primordial radiations. A complete set of equations and consistentinitial conditions in the long wavelength limit are given with an explicitderivation in the covariant approach with CDM frame, by newly taking intoaccount a non-relativistic matter contribution in the radiation dominated era.By solving these equations numerically, we derive the angular spectrum ofcosmic microwave background anisotropies and the matter power spectrum withmagnetic fields. We find that the amplitude of the angular power spectrum ofCMB anisotropies can alter at most a order of magnitude at $l \lesssim 4000$compared with the previous results in the literature.



Author: Kazuhiko Kojima, Kiyotomo Ichiki

Source: https://arxiv.org/







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