Challenges in generating density perturbations from a fluctuating inflaton coupling

Details Challenges in generating density perturbations from a fluctuating inflaton coupling Challenges in generating density perturbations from a fluctuating inflaton coupling

2003-04-10

arxiv.org/abs/astro-ph/0304187v1

Phys.Rev. D67 (2003) 121303

Astronomy and Astrophysics

Astrophysics

3 pages

Scientific paper

10.1103/PhysRevD.67.121303

We discuss the possibility of generating adiabatic density perturbations from spatial fluctuations in the inflaton decay rate which are due to quantum fluctuations of light moduli fields coupling to the inflaton. We point out that non-renormalizable operators, which lift the flatness of the moduli potential, play an important role for the density perturbations. In particular, the non-renormalizable terms give rise to a considerable damping of the fluctuations and thereby pose an obstruction to the construction of possible models.

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