Adiabatic CMB perturbations in pre-big bang string cosmology

Details Adiabatic CMB perturbations in pre-big bang string cosmology Adiabatic CMB perturbations in pre-big bang string cosmology

2001-09-24

arxiv.org/abs/hep-ph/0109214v3

Nucl.Phys. B626 (2002) 395-409

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 figure; Version to appear in Nucl.Phys.B. Figure improved, discussion and one reference added

Scientific paper

10.1016/S0550-3213(02)00043-3

We consider the pre-big bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt $\Delta n$ in the range $-0.1 \lesssim \Delta n \lesssim 1$.

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