Seeds of large-scale anisotropy in string cosmology | Zendy

Ruth Durrer | Zendy; M. Gasperini | Zendy; Mairi Sakellariadou | Zendy; G. Veneziano | Zendy

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Seeds of large-scale anisotropy in string cosmology

Author(s) -

Ruth Durrer,

M. Gasperini,

Mairi Sakellariadou,

G. Veneziano

Publication year - 1999

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Language(s) - English

Resource type - Journals

eISSN - 1089-4918

pISSN - 0556-2821

DOI - 10.1103/physrevd.59.043511

Subject(s) - physics , axion , multipole expansion , cosmology , cosmic microwave background , massless particle , dilaton , anisotropy , inflation (cosmology) , theoretical physics , string (physics) , scalar (mathematics) , scale (ratio) , tensor (intrinsic definition) , particle physics , astrophysics , quantum electrodynamics , dark matter , quantum mechanics , geometry , mathematics

Pre-big bang cosmology predicts tiny first-order dilaton and metricperturbations at very large scales. Here we discuss the possibility that other-- more copiously generated -- perturbations may act, at second order, asscalar seeds of large-scale structure and CMB anisotropies. We study, inparticular, the cases of electromagnetic and axionic seeds. We compute thestochastic fluctuations of their energy-momentum tensor and determine theresulting contributions to the multipole expansion of the temperatureanisotropy. In the axion case it is possible to obtain a flat or slightlytilted blue spectrum that fits present data consistently, both for massless andfor massive (but very light) axions.Comment: 27 pages, LATEX, one figure included using eps

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