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UID:UW-Physics-Event-8993
DTSTART:20241112T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260413T223205Z
LAST-MODIFIED:20241106T215102Z
LOCATION:Join Zoom Meeting https://berkeley.zoom.us/j/98987749464   Me
 eting ID: 989 8774 9464 Passcode: 986897
SUMMARY:Cosmology of Dark Energy Radiation\, Network in Neutrinos\, Nu
 clear Astrophysics\, and Symmetries (N3AS) Seminar\, Dr. Kim Berghaus 
 \, Caltech
DESCRIPTION:If dark energy evolves in time its dynamical component cou
 ld be dominated by a bath of dark radiation. Since dark energy was sub
 dominant in the early universe\, the dark energy radiation evades the 
 usual stringent constraints on extra relativistic species from the cos
 mic microwave background\, allowing for up to 9% of the energy density
  today to be dark radiation. In this talk\, I will discuss how dark en
 ergy radiation can emerge from a fundamental theory\, its predictions 
 for cosmological observables\, as well as discovery potential and cons
 traints with existing and future precision cosmological datasets inclu
 ding measurements of the cosmic microwave background\, baryon acoustic
  oscillations\, and supernova data. Considering extensions that allow 
 the dark radiation to populate neutrinos\, axions\, and dark photons\,
  I will discuss the direct detection prospects of a thermal background
  comprised of these candidates consistent with cosmological constraint
 s on dark energy radiation. A dark photon background is the most promi
 sing prospect for direct detection\, and experimental programs such as
  the late dark energy radiation experiment (LADERA) will probe new par
 ameter space.<br>\n <br>\nNOTE: All participants and hosts are now req
 uired to sign into a Zoom account prior to joining meetings hosted by 
 UC Berkeley.<br>\n
URL:https://www.physics.wisc.edu/events/?id=8993
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