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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-6305
DTSTART:20210216T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T024458Z
LAST-MODIFIED:20210212T230125Z
LOCATION:https://berkeley.zoom.us/j/91922781599
SUMMARY:Hydrogen Mixing and the EDGES Anomaly\, Network in Neutrinos\,
  Nuclear Astrophysics\, and Symmetries (N3AS) Seminar\, Luke Johns\, U
 C-Berkeley
DESCRIPTION:In 2018 the EDGES collaboration announced a detection of 2
 1 cm hyperfine absorption at redshifts between about 15 and 20. The si
 gnal may indicate that the hydrogen gas at cosmic dawn was significant
 ly colder than predicted. I'll describe a new scenario that might solv
 e the mystery: hydrogen oscillates into a mirror state over the course
  of the cosmic dark ages\, leaving the remnant gas cooled and the anom
 aly imprinted. This proposal differs markedly from other BSM scenarios
  in both the relevant microphysics and the implications for model buil
 ding and cosmology.
URL:https://www.physics.wisc.edu/events/?id=6305
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