A bound on inflationary energy density from the isotropy of the microwave background

Details A bound on inflationary energy density from the isotropy of the microwave background A bound on inflationary energy density from the isotropy of the microwave background

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phlb..147..403l&link_type=abstract

Physics Letters B, Volume 147, Issue 6, p. 403-404.

Physics

68

Scientific paper

The following strong inequality is established in the inflationary scenario (units units h = c = 8πG = 1); ϱ* << 7(a2) 2. Here ϱ* is the energy density of the universe at the beginning of the radiation dominated era, a2 is the quadrupole anisotropy of the microwave background. The present limit on a2 implies that ϱ*1/4 is more than two orders of magnitude below the Planck mass. The limit arises from the effect of energy density perturbations, the effect of gravitational waves being small.

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