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SUMMARY:Six Things That Are Probably Not Dark Matter
DTSTART:20260805T193000Z
DTEND:20260805T213000Z
DTSTAMP:20261005T235400Z
UID:indico-event-10684@indico.slac.stanford.edu
DESCRIPTION:Speakers: Ian Holst (U. Chicago)\n\nThe study of dark matter p
 resents an opportunity to learn more about the fundamental particles that 
 make up our universe and their impact on cosmological evolution and astrop
 hysical phenomena. We focus on both particle dark matter and primordial bl
 ack holes to explore their predictions and constraints in various scenario
 s\, as well as their potential links to other mysteries in cosmology and a
 strophysics. In particular\, we propose several particle models which not 
 only generate the observed abundance of dark matter\, but also have implic
 ations for the muon's magnetic moment\, the electroweak hierarchy problem\
 , and neutrino masses. We also show that dark matter production by both fr
 eeze-in and freeze-out mechanisms generates small isocurvature perturbatio
 ns that are not constrained by observations of the cosmic microwave backgr
 ound. Using data from the Fermi Gamma-Ray Telescope\, we constrain the pro
 perties of millisecond pulsars in our galaxy\, with consequences for the G
 alactic Center GeV gamma-ray excess. We explore the rich phenomenology of 
 a period of primordial black hole domination\, which leads to enhanced bla
 ck hole clustering and merging\, leaving behind merged relics that live fo
 r long after the initial population has evaporated. If primordial black ho
 les serve as dark matter\, we find that when they encounter and are captur
 ed by neutron stars\, their orbits can be vulnerable to tidal disruption b
 y nearby bodies\, limiting constraints on their abundance from that proces
 s.\n\nhttps://indico.slac.stanford.edu/event/10684/
LOCATION:48/2-224 - Madrone (SLAC)
URL:https://indico.slac.stanford.edu/event/10684/
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