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English

Massless (pseudo-)scalar seeds of CMB anisotropy

Published inPhysics letters. B, vol. 436, p. 66-72
Publication date1998
Abstract

A primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the matter-dominated era. A general relation between multipole coefficients of the CMB anisotropy and the seed's energy spectrum is derived. Magnitude and tilt of the observed anisotropies can be reproduced for the nearly scale-invariant axion spectra that are predicted in a particularly symmetric class of string cosmology backgrounds.

Citation (ISO format)
DURRER, Ruth et al. Massless (pseudo-)scalar seeds of CMB anisotropy. In: Physics letters. B, 1998, vol. 436, p. 66–72. doi: 10.1016/S0370-2693(98)00833-8
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ISSN of the journal0370-2693
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