Constraints on pre-big bang models for seeding large-scale anisotropy by massive Kalb-Ramond axions
arXiv:hep-ph/9806327 · doi:10.1103/PhysRevD.59.043503
Abstract
We discuss the conditions under which pre-big bang models can fit the observed large-scale anisotropy with a primordial spectrum of massive (Kalb--Ramond) axion fluctuations. The primordial spectrum must be sufficiently flat at low frequency and sufficiently steeper at high frequency. For a steep and/or long enough high-frequency branch of the spectrum the bounds imposed by COBE's normalization allow axion masses of the typical order for a Peccei--Quinn--Weinberg--Wilczek axion. We provide a particular example in which an appropriate axion spectrum is obtained from a class of backgrounds satisfying the low-energy string cosmology equations.
11 pages, revtex, two figures included using epsfig. An updated collection of papers on the pre-big bang scenario is available at http://www.to.infn.it/~gasperin
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