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CATEGORIES:DAMTP Friday GR Seminar
SUMMARY:Constraining Lorentz Violation During Inflation -
Adam Solomon (DAMTP / University of Cambridge)
DTSTART;TZID=Europe/London:20140214T130000
DTEND;TZID=Europe/London:20140214T140000
UID:TALK50918AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/50918
DESCRIPTION:I discuss the consequences of Lorentz violation on
cosmology and in particular during slow-roll infl
ation. The model is a canonical scalar inflaton co
upled to a fixed-norm timelike vector field\, or "
aether." The vector is described by Einstein-aethe
r theory\, a vector-tensor theory of gravitational
Lorentz violation. If the scale of Lorentz violat
ion is sufficiently small compared to the Planck m
ass\, and the strength of the scalar-aether coupli
ng is suitably large\, then the spin-0 and spin-1
perturbations grow exponentially and spoil the inf
lationary background. The effects of such a coupli
ng on the CMB are too small to be visible to curre
nt 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 pot
ential and a worked example\, m^2 \\phi^2 inflatio
n with a quadratic scalar-aether coupling term.
LOCATION:Pavilion B Potter Room (B1.19)
CONTACT:Helvi Witek
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