The fluid of primordial fluctuations.

Details The fluid of primordial fluctuations. The fluid of primordial fluctuations.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ijtp...38.1359g&link_type=abstract

International Journal of Theoretical Physics, Vol. 38, No. 4, p. 1359 - 1371

Physics

1

Cosmology: Inflationary Universe, Cosmology: Density Fluctuations

Scientific paper

The author formulates a phenomenological model where the inflation fluctuations are treated as a fluid. By applying the hydrodynamic equations to this fluid one recovers the conventional result that relates the spectrum of density fluctuations in the inflation field at reentering the horizon to the spectrum of fluctuations at the time a scale leaves the horizon. Moreover, through the equivalent viscosity of the fluid one obtains a Reynolds number that suggests turbulent motion, which implies that mode-mode coupling in the inflation field cannot be neglected. For de Sitter inflation the resulting spectrum using turbulence theory is scale invariant on all scales of interest. This suggests that the hypothesis of an extremely weakly coupled inflation could be relaxed without affecting the predictions of the model.

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