Large-scale energy-density perturbations and inflation

Details Large-scale energy-density perturbations and inflation Large-scale energy-density perturbations and inflation

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrvd..31.1792l&link_type=abstract

Physical Review D (Particles and Fields), Volume 31, Issue 8, 15 April 1985, pp.1792-1798

Physics

253

Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

A first-order differential equation is given for large-scale energy-density perturbations in a Friedmann universe, which expresses the fact that each region of spacetime evolves like a separate Friedmann universe with small spatial curvature (the average curvature is taken to vanish). Using it perturbations generated in an inflationary era are evolved to the present (for sufficiently large scales) with essentially no assumption about intervening eras. The field fluctuations are shown to be essentially quantum mechanical until a few Hubble times after the scale leaves the horizon during the de Sitter era, but probably classical at later times. Full comparison with earlier work is made.

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