Slow-Roll Inflation in the Presence of a Dark Energy Coupling

Details Slow-Roll Inflation in the Presence of a Dark Energy Coupling Slow-Roll Inflation in the Presence of a Dark Energy Coupling

2008-12-15

arxiv.org/abs/0812.2843v2

Phys.Rev.D79:103508,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 7 figures; added references and a more detailed treatment of the perturbation equations (Sec. II.B and fig.1)

Scientific paper

10.1103/PhysRevD.79.103508

In models of coupled dark energy, in which a dark energy scalar field couples to other matter components, it is natural to expect a coupling to the inflaton as well. We explore the consequences of such a coupling in the context of single field slow-roll inflation. Assuming an exponential potential for the quintessence field we show that the coupling to the inflaton causes the quintessence field to be attracted towards the minimum of the effective potential. If the coupling is large enough, the field is heavy and is located at the minimum. We show how this affects the expansion rate and the slow-roll of the inflaton field, and therefore the primordial perturbations generated during inflation. We further show that the coupling has an important impact on the processes of reheating and preheating.

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