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Constraining Lorentz Violation During Inflation
  OKC/Nordita High-Energy Physics Theory seminar

Monday 27 January 2014
from 13:30 to 15:00
at 122:026
Speaker : Adam Solomon (DAMTP, Cambridge)
Abstract : I discuss the consequences of Lorentz violation on cosmology and in particular during slow-roll inflation. The model is a canonical scalar inflaton coupled to a fixed-norm timelike vector field, or "aether." The vector is described by Einstein-aether theory, a vector-tensor theory of gravitational Lorentz violation. If the scale of Lorentz violation is sufficiently small compared to the Planck mass, and the strength of the scalar-aether coupling is suitably large, then the spin-0 and spin-1 perturbations grow exponentially and spoil the inflationary background. The effects of such a coupling on the CMB are too small to be visible to current or near-future CMB experiments; unusually, no isocurvature modes are produced at first order in a perturbative expansion around the aether norm. These results are discussed for both a general potential and a worked example, m^2 \phi^2 inflation with a quadratic scalar-aether coupling term.

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