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SUMMARY:R^2 gravity heals Higgs inflation\, but does not cool it
DTSTART:20190722T140000
DTEND:20190722T153000
DTSTAMP:20260511T105425Z
UID:3f4ef87fabce3d30b6864ea0511b90cbc102b77137f01b7e7c9076aa
CATEGORIES:Conferences - Seminars
DESCRIPTION:Anna Tokareva (Moscow\, INR)\nStrong coupling in Higgs inflati
 on at high energies hinders a joint description of inflation\, reheating a
 nd low-energy dynamics. The situation may be improved with a proper UV com
 pletion of the model. A well-defined self-consistent way is to introduce a
 n R2-term into the action. In this modified model the strong coupling scal
 e returns back to the Planck scale\, which justifies the use of the pertur
 bative methods in studies of the model dynamics after inflation. We invest
 igate the reheating of the post-inflationary Universe\, which involves two
  highly anharmonic oscillators strongly interacting with each other: homog
 eneous Higgs field and scalaron. We observe that in interesting regions of
  model parameter space these oscillations make longitudinal components of 
 the weak gauge bosons tachyonic\, triggering instant preheating at timesca
 les much shorter than the Hubble time. The weak gauge bosons are heavy and
  decay promptly into light Standard Model particles\, ensuring the onset o
 f the radiation domination era right after inflation.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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