Particle Creation in Pre-Big-Bang Cosmology: theory and observational consequences

Abstract

We present some phenomenological aspects of the pre-big-bang cosmological model inspired by the duality properties of string theory. In particular, assuming the spatial sections of the homogeneous background geometry to be isotropic, we discuss the quantum production of perturbations of the background fields (gravitons, dilatons, moduli fields), as well as the production of particles which do not contribute to the background, which we call ``seeds''. As such we consider the cases of electromagnetic and axionic seeds. We also discuss their possible observational consequences, for example, we study whether they can provide the origin of primordial galactic magnetic fields, and whether they can generate the initial fluctuations leading to the formation of large-scale structure and the measured cosmic microwave background anisotropies. We finally analyze axion and photon production in four dimensional anisotropic pre-big-bang cosmological models.

arXiv commentReview article for the memorial volume of Dennis Sciama to be published in New Astronomy Review. In this revised version new results, especially for the dilaton and moduli spectra have been included and several typos have been corrected. Version to match the one presently in print

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Cited by in corpus (5)

• Primordial magnetogenesis
• Large scale magnetic fields from gravitationally coupled electrodynamics
• Primordial magnetic seed fields from extra dimensions
• A generalized $\Lambda$CDM model with parameterized Hubble parameter in particle creation, viscous and $f(R)$ model framework
• Entropies of the various components of the universe