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Unconventional Scenarios and Perturbations Therein
2005
Physica Scripta
After introducing a class of string-inspired unconventional cosmologies, I will discuss the spectra of adiabatic scalar and tensor perturbations therein. On the basis of a toy model I will argue that those spectra are quite likely too "blue" to be responsible for the observed large-scale structure of our Universe. I will then discuss a possible way out of this impasse whereby a scale-invariant spectrum of adiabatic density fluctuations emerges through the early decay of the Kalb-Ramond axion of string theory.
doi:10.1238/physica.topical.117a00051
fatcat:k4b6gl6utfellnlxkr2ml2ear4