Density fluctuations on super-Hubble scales

Details Density fluctuations on super-Hubble scales Density fluctuations on super-Hubble scales

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.244...73f&link_type=abstract

Astrophysics and Space Science, Volume 244, Issue 1-2, pp. 73-80

Astronomy and Astrophysics

Astrophysics

Scientific paper

According to causality, the existence of density perturbations on scales larger than the present Hubble radiusy = 2c/H 0 is crucial for discriminating between inflation and non-inflation models of the origin of inhomogeneity of the universe. Observations of the cosmic background radiation anisotropies favor a super-Hubble suppression on scales λ max in the range 0.5 3.0y. Many of non-inflation models are consistent with such a suppression. Inflation models are certainly not in conflict with this suppression; however one important parameter, the duration of the epoch of inflation, may need to be fine-tuned.

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