Unconventional Scenarios and Perturbations Therein

Details Unconventional Scenarios and Perturbations Therein Unconventional Scenarios and Perturbations Therein

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005stc..conf...51v&link_type=abstract

STRING THEORY AND COSMOLOGY. Proceedings of Nobel Symposium 127. Held 14-19 August 2003 in Sigtuna, Sweden. Edited by U Danielss

Physics

Origin And Formation Of The Universe, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

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.

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