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SUMMARY:Graham White (TRIUMF)
DTSTART:20200724T160000Z
DTEND:20200724T173000Z
DTSTAMP:20260423T005654Z
UID:CMU-TP/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/4/">B
 BN and CMB bounds on hidden sector vectors</a>\nby Graham White (TRIUMF) a
 s part of Carnegie Mellon theoretical physics\n\n\nAbstract\nNew dark vect
 or bosons that couple very feebly to regular matter can be produced\nin th
 e early universe and decay after the onset of Big Bang Nucleosynthesis (BB
 N)\nor the formation of the cosmic microwave background (CMB) at recombina
 tion. The\nenergy injected by such decays can modify the light element abu
 ndances or modify\nthe power and frequency spectra of the CMB. In this wor
 k we study the constraints\nimplied by these considerations on a range of 
 sub-GeV dark vectors including the\nkinetically mixed dark photon\, as wel
 l as gauge B-L and lepton families. We focus on the \neffects of electroma
 gnetic energy injection\, and we update\nprevious investigations of the da
 rk photon by taking into account non-universality\nin the photon cascade s
 pectrum relevant for BBN and the energy dependence of the\nionization effi
 ciency after recombination in our treatment of modifications to the CMB.\n
LOCATION:https://researchseminars.org/talk/CMU-TP/4/
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