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Seeds of large-scale anisotropy in string cosmology

Authors
Gasperini, M.
Sakellariadou, Mairi
Veneziano, Gabriele
Published in Physical Review. D. 1999, vol. 59, no. 043511, p. 21
Abstract Pre-big bang cosmology predicts tiny first-order dilaton and metric perturbations at very large scales. Here we discuss the possibility that other -- more copiously generated -- perturbations may act, at second order, as scalar seeds of large-scale structure and CMB anisotropies. We study, in particular, the cases of electromagnetic and axionic seeds. We compute the stochastic fluctuations of their energy-momentum tensor and determine the resulting contributions to the multipole expansion of the temperature anisotropy. In the axion case it is possible to obtain a flat or slightly tilted blue spectrum that fits present data consistently, both for massless and for massive (but very light) axions.
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DURRER, Ruth et al. Seeds of large-scale anisotropy in string cosmology. In: Physical Review. D, 1999, vol. 59, n° 043511, p. 21. https://archive-ouverte.unige.ch/unige:977

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Deposited on : 2009-02-26

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