Seeds of large-scale anisotropy in string cosmology

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dc.creatorDurrer, R.
dc.creatorGasperini, M.
dc.creatorSakellariadou, M.
dc.creatorVeneziano, G.
dc.date1998-04-28
dc.date.accessioned2026-07-07T11:46:26Z
dc.date.available2026-07-07T11:46:26Z
dc.descriptionPre-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.
dc.description27 pages, LATEX, one figure included using epsf
dc.identifierhttps://arxiv.org/abs/gr-qc/9804076
dc.identifierhttp://arxiv.org/abs/gr-qc/9804076
dc.identifierPhys.Rev.D59:043511,1999
dc.identifierdoi:10.1103/PhysRevD.59.043511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202224
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.titleSeeds of large-scale anisotropy in string cosmology
dc.typetext

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