Scientific article
Open access

Seeds of large-scale anisotropy in string cosmology

Published inPhysical review. D. Particles and fields, vol. 59, no. 043511, 21
Publication date1999

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.

Citation (ISO format)
DURRER, Ruth et al. Seeds of large-scale anisotropy in string cosmology. In: Physical review. D. Particles and fields, 1999, vol. 59, n° 043511, p. 21. doi: 10.1103/PhysRevD.59.043511
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Article (Accepted version)
ISSN of the journal0556-2821

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