Coupling the inflaton to an expanding aether

Details Coupling the inflaton to an expanding aether Coupling the inflaton to an expanding aether

2010-07-15

arxiv.org/abs/1007.2594v2

Phys.Rev.D82:064032,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages. v2: matches PRD version

Scientific paper

10.1103/PhysRevD.82.064032

We consider a Lorentz-violating theory of inflation consisting of Einstein-aether theory with a scalar inflaton coupled bilinearly to the expansion of the aether. We determine the conditions for linearized stability, positive energy, and vanishing of preferred-frame post-Newtonian parameters, and find that all these conditions can be met. In homogeneous and isotropic cosmology, the inflaton-aether expansion coupling leads to a driving force on the inflaton that is proportional to the Hubble parameter. This force affects the slow-roll dynamics, but still allows for a natural end to inflation.

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