Seeds of large-scale anisotropy in string cosmology
- 22 January 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 59 (4) , 043511
- https://doi.org/10.1103/physrevd.59.043511
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.Keywords
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This publication has 59 references indexed in Scilit:
- Pre-big-bang inflation requires fine-tuningPhysical Review D, 1997
- Graceful exit and energy conditions in string cosmologyPhysics Letters B, 1997
- One-loop superstring cosmology and the nonsingular universePhysical Review D, 1996
- Singularity and exit problems in two-dimensional string cosmologyPhysics Letters B, 1996
- Back Reaction and Graceful Exit in String Inflationary CosmologyPhysical Review Letters, 1996
- Four-Year [ITAL]COBE[/ITAL] DMR Cosmic Microwave Background Observations: Maps and Basic ResultsThe Astrophysical Journal, 1996
- Relic gravitational waves from string cosmologyPhysics Letters B, 1995
- Cosmic temperature fluctuations from two years of COBE differential microwave radiometers observationsThe Astrophysical Journal, 1994
- O(d, d)-covariant string cosmologyPhysics Letters B, 1992
- Development of axion perturbations in an axion dominated universePhysics Letters B, 1983