Brandenberger, Robert H.Nayeri, AliPatil, Subodh P.Vafa, CumrunBrandenberger, RobertPatil, Subodh2019-09-222006BRANDENBERGER, ROBERT H., ALI NAYERI, SUBODH P. PATIL, and CUMRUN VAFA. 2007. “STRING GAS COSMOLOGY AND STRUCTURE FORMATION.” International Journal of Modern Physics A 22 (21): 3621–42. https://doi.org/10.1142/s0217751x07037159.0217-751X1793-656Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41385013It has recently been shown that a Hagedorn phase of string gas cosmology may provide a causal mechanism for generating a nearly scale-invariant spectrum of scalar metric fluctuations, without the need for an intervening period of de Sitter expansion. A distinctive signature of this structure formation scenario would be a slight blue tilt of the spectrum of gravitational waves. In this paper we give more details of the computations leading to these results, and the assumptions underlying them.en-USJournal Article2019-09-2210.1142/S0217751X07037159