Can inflation explain small density fluctuations in the universe?

Details Can inflation explain small density fluctuations in the universe? Can inflation explain small density fluctuations in the universe?

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuphb.324..141w&link_type=abstract

Nuclear Physics B, Volume 324, Issue 1, p. 141-156.

Physics

Nuclear Physics

15

Scientific paper

We investigate an inflationary scenario leading to a power spectrum for the scale dependence of primordial density fluctuations, Δϱ/ϱ ~ l-ν. The model has no very small dimensionless parameters and Δϱ/ϱ is of order unity for scales lE corresponding to the horizon near the end of inflation. The small primordial density fluctuations on galactic scales lG are explained by the huge ratio lG/lE, and are therefore a direct consequence of the many e-foldings of the scale factor during inflation. Possible observable consequences for the structure formation in the universe are shortly addressed.
This research was mainly performed during a visit at ITP, Santa Barbara, and supported in part by the National Science Foundation under Grant No. PHY82-17853, supplemented by funds from the National Aeronautics and Space Administration.

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