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SUMMARY:Constraining Lorentz Violation During Inflation - Adam Solomon (DA
 MTP / University of Cambridge)
DTSTART:20140214T130000Z
DTEND:20140214T140000Z
UID:TALK50918@talks.cam.ac.uk
CONTACT:Helvi Witek
DESCRIPTION:I discuss the consequences of Lorentz violation on cosmology a
 nd in particular during slow-roll inflation. The model is a canonical scal
 ar inflaton coupled to a fixed-norm timelike vector field\, or "aether." T
 he vector is described by Einstein-aether theory\, a vector-tensor theory 
 of gravitational Lorentz violation. If the scale of Lorentz violation is s
 ufficiently small compared to the Planck mass\, and the strength of the sc
 alar-aether coupling is suitably large\, then the spin-0 and spin-1 pertur
 bations grow exponentially and spoil the inflationary background. The effe
 cts of such a coupling on the CMB are too small to be visible to current o
 r near-future CMB experiments\; unusually\, no isocurvature modes are prod
 uced at first order in a perturbative expansion around the aether norm. Th
 ese results are discussed for both a general potential and a worked exampl
 e\, m^2 \\phi^2 inflation with a quadratic scalar-aether coupling term.
LOCATION:Pavilion B Potter Room (B1.19)
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