Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-20
New Astron.Rev. 46 (2002) 659
Astronomy and Astrophysics
Astrophysics
Review article for the memorial volume of Dennis Sciama to be published in New Astronomy Review. In this revised version new r
Scientific paper
10.1016/S1387-6473(02)00235-X
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.
Durrer Ruth
Kunze Kerstin E.
Sakellariadou Mairi
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