Scenarios of modulated perturbations

Details Scenarios of modulated perturbations Scenarios of modulated perturbations

2004-03-15

arxiv.org/abs/astro-ph/0403351v2

Phys.Rev. D70 (2004) 043507

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures. Final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.70.043507

In an alternative mechanism recently proposed, adiabatic cosmological perturbations are generated at the decay of the inflaton field due to small fluctuations of its coupling to matter. This happens whenever the coupling is governed by the vacuum expectation value of another field, which acquires fluctuations during inflation. We discuss generalization and various possible implementations of this mechansim, and present some specific particle physics examples. In many cases the second field can start oscillating before perturbations are imprinted, or survive long enough so to dominate over the decay products of the inflaton. The primordial perturbations will then be modified accordingly in each case.

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