The spectrum of curvature perturbations from hybrid inflation

Details The spectrum of curvature perturbations from hybrid inflation The spectrum of curvature perturbations from hybrid inflation

1996-06-07

arxiv.org/abs/astro-ph/9606047v1

Phys.Rev.D54:7181-7185,1996

Astronomy and Astrophysics

Astrophysics

LaTeX (with RevTex) 5 pages, 3 uuencoded figures appended, also available on WWW via http://star-www.maps.susx.ac.uk/index.htm

Scientific paper

10.1103/PhysRevD.54.7181

We study the amplitude and spectral tilt of density perturbations in the simplest hybrid inflation models. We give an exact expression for the amplitude of quantum fluctuations on all scales in the limit where we can neglect the backreaction on the metric. This is a very good approximation for values of the inflaton field well below the Planck scale and our results remain valid far from the usual massless limit. We confirm that the primordial density spectrum in this model has a constant spectral index n>1 over all observable scales. For the small values of the tilt (n<1.4) required by observations, the results remain close to those obtained using the quasi-massless approximation.

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