Particle decay during inflation: self-decay of inflaton quantum fluctuations during slow roll

Details Particle decay during inflation: self-decay of inflaton quantum fluctuations during slow roll Particle decay during inflation: self-decay of inflaton quantum fluctuations during slow roll

2004-09-16

arxiv.org/abs/astro-ph/0409406v2

Phys.Rev.D71:023509,2005

Astronomy and Astrophysics

Astrophysics

27 pages, LaTex, 5 .eps figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.023509

Particle decay during inflation is studied by implementing a dynamical renormalization group resummation combined with a small Delta expansion. Delta measures the deviation from the scale invariant power spectrum and regulates the infrared. In slow roll inflation, Delta is a simple function of the slow roll parameters epsilon_V, eta_V.We find that quantum fluctuations can self-decay as a consequence of the inflationary expansion through processes which are forbidden in Minkowski space-time. We compute the self-decay of the inflaton quantum fluctuations during slow roll inflation.For wavelengths deep inside the Hubble radius the decay is enhanced by the emission of ultrasoft collinear quanta, i.e. bremsstrahlung radiation of superhorizon quanta which becomes the leading decay channel for physical wavelengths H<3.6 10^{-9}.

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