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Title

Massless (pseudo-)scalar seeds of CMB anisotropy

Authors
Gasperini, M.
Sakellariadou, Mairi
Veneziano, Gabriele
Published in Physics Letters. B. 1998, vol. 436, p. 66-72
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.
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DURRER, Ruth et al. Massless (pseudo-)scalar seeds of CMB anisotropy. In: Physics Letters. B, 1998, vol. 436, p. 66-72. https://archive-ouverte.unige.ch/unige:983

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Deposited on : 2009-02-26

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