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SUMMARY:Cosmological implications of EW vacuum instability: constraints on
  the Higgs-curvature coupling from inflation
DTSTART;VALUE=DATE-TIME:20210901T171500Z
DTEND;VALUE=DATE-TIME:20210901T173000Z
DTSTAMP;VALUE=DATE-TIME:20260716T013838Z
UID:indico-contribution-15658@indico.ific.uv.es
DESCRIPTION:Speakers: Andreas Mantziris (Imperial College London)\nThe cur
 rent experimentally measured parameters of the Standard Model (SM) suggest
  that our Universe lies in a metastable electroweak vacuum\, where the Hig
 gs field is prone to vacuum decay to a lower state with catastrophic conse
 quences. Our measurements dictate that such an event has not taken place y
 et\, despite the many different mechanisms that could have triggered it in
  our past light-cone. The focus of our work has been to calculate the prob
 ability of the false vacuum to decay during the period of inflation and us
 e it to constrain the last unknown renormalisable SM parameter $\\xi$\, wh
 ich couples the Higgs field with space-time curvature. More specifically\,
  we derived lower $\\xi$-bounds from vacuum stability in three inflationar
 y models: quadratic and quartic chaotic inflation\, and Starobinsky-like p
 ower-law inflation. We also took the time-dependence of the Hubble rate in
 to account both in the geometry of our past light-cone and in the Higgs ef
 fective potential\, which is approximated with three-loop renormalisation 
 group improvement supplemented with one-loop curvature corrections. Finall
 y\, an overview of some preliminary results regarding this calculation in 
 the context of $R^2$-inflation will be given .\n\nhttps://indico.ific.uv.e
 s/event/6178/contributions/15658/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15658/
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