CMB Anisotropies Through Axion Decay in Pre-Big Bang Models

Details CMB Anisotropies Through Axion Decay in Pre-Big Bang Models CMB Anisotropies Through Axion Decay in Pre-Big Bang Models

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.1744b&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

In curvaton models the convertion of isocurvature perturbations into adiabatic ones takes place through the decay of an auxiliary massive scalar field. In the Pre-Big Bang scenario, the role of the curvaton can be naturally played by the Kalb-Ramond axion present in the low energy effective action of superstring theory. A complete analysis of the coupled equations of axion and metric perturbations shows that a scale-invariant adiabatic spectrum for scalar perturbations can be obtained in this context. Recent observations of CMB anisotropies are used to constrain the parameter space of the model.

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