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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-7893
DTSTART:20220908T170000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T071511Z
LAST-MODIFIED:20220907T183741Z
LOCATION:Chamberlin 5280
SUMMARY:Axion Solar Halos\, Theory Seminar (High Energy/Cosmology)\, J
 oshua Eby\, Tokyo U.\, IPMU
DESCRIPTION:Ultralight dark matter (ULDM) is known to form self-gravit
 ating bound states through gravitational relaxation. There are intrigu
 ing hints in the literature suggesting similar dynamics might lead to 
 overdensities in the solar system as well\, with ULDM becoming bound t
 o the Sun. These Solar Halos can be probed by experiments on Earth whe
 n their radius R > 1 AU\, which implies ULDM particle masses m < 10^{-
 14} eV. For larger masses m\, space-based missions on orbits within 1 
 AU can probe small\, compact Solar Halos with exceptional reach\; for 
 scalar couplings probable in current and near-future atomic clock syst
 ems\, the sensitivity can exceed that of Equivalence Principle tests a
 nd probe well-motivated space for natural scalar field models. I will 
 review the state of the art on these topics\, including the use of ast
 eroids as direct probes of DM density\, as well as several exciting NA
 SA and international missions that motivate searches aboard space prob
 es.
URL:https://www.physics.wisc.edu/events/?id=7893
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