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APS » Journals » Phys. Rev. D » Volume 67 » Issue 12
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Phys. Rev. D 67, 121303(R) (2003) [3 pages]

Challenges in generating density perturbations from a fluctuating inflaton coupling

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Kari Enqvist
Department of Physical Sciences, P. O. Box 64, FIN-00014, University of Helsinki, Finland
Helsinki Institute of Physics, P. O. Box 64, FIN-00014, University of Helsinki, Finland

Anupam Mazumdar
CHEP, McGill University, Montréal, QC, Canada H3A 2T8

Marieke Postma
The Abdus Salam International Centre for Theoretical Physics, I-34100, Trieste, Italy

Received 14 April 2003; published 26 June 2003

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 nonrenormalizable operators, which lift the flatness of the moduli potential, play an important role for the density perturbations. In particular, the nonrenormalizable terms give rise to a considerable damping of the fluctuations and thereby pose an obstruction to the construction of possible models.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.67.121303
DOI:
10.1103/PhysRevD.67.121303
PACS:
98.80.Cq
 
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