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SUMMARY:Stellar cooling bounds on new light particles: including plasma ef
 fects - Edward Hardy (ICTP Trieste)
DTSTART:20170609T150000Z
DTEND:20170609T163000Z
UID:TALK73030@talks.cam.ac.uk
CONTACT:Francesco Coradeschi
DESCRIPTION:Strong constraints on the coupling of new light particles to t
 he Standard\nModel (SM) arise from their production in the hot cores of st
 ars\, and the\neffects of this on stellar cooling. However\, the large ele
 ctron density in\nstellar cores significantly modifies the in-medium propa
 gation of SM\nstates. I will show that for new light particles which have 
 an effective\nin-medium mixing with the photon\, such plasma effects can r
 esult in\nparametrically different production rates to those obtained from
  a naive\ncalculation. Taking these previously-neglected contributions int
 o account\,\nI will give updated estimates for the stellar cooling bounds 
 on a number\nof light new particle candidates. In particular\, the bounds 
 on light (m <\nkeV) scalars coupling to electrons or nucleons are strength
 ened by 3\norders of magnitude\, supernova cooling bounds on dark photon c
 ouplings are\nsignificantly revised\, and the mass dependence of stellar b
 ounds on new\nvectors are qualitatively changed.\n
LOCATION:B1.19\, DAMTP
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