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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6112
DTSTART:20201023T190000Z
DTEND:20201023T200000Z
DTSTAMP:20260415T003619Z
LAST-MODIFIED:20201020T140557Z
LOCATION:For zoom link\, sign up at: https://groups.google.com/a/g-gro
 ups.wisc.edu/d/forum/theoryseminars/join
SUMMARY:New roads to discovery of light states\, Theory Seminar (High 
 Energy/Cosmology)\, Jeff Dror\, UC Berkeley
DESCRIPTION:Light particles can imprint themselves on our detectors in
  spectacular and often subtle ways. In this talk\, I will present two 
 new probes of hidden sectors. In the first part\, I consider the prosp
 ect of seeing a relativistic background of axions\, a so-called "cosmi
 c axion background" (CaB). This background can have a range of possibl
 e cosmic sources and I consider several possible mechanisms (with the 
 most well known being thermal production). Furthermore\, I will show t
 hat with dedicated searches\, a CaB may be detectable with cavity expe
 riments such as ADMX or DM-radio. In the second part\, I revisit pheno
 menology of leptonic gauge bosons (such as Lmu-Ltau) showing that they
  couple to a non-conserved current.This property can be used to show t
 hat in the high energy limit\, these gauge bosons are equivalent to ma
 jorons. This allows them to be discovered using several new probes inc
 luding neutrino decays\, meson decays\, neutrinoless double beta decay
  searches\, and neutrino annihilations in thermal systems. These bound
 s drastically shape the parameter space of these theories.
URL:https://www.physics.wisc.edu/events/?id=6112
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