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SUMMARY:Searching for Ultralight Axions with Black Holes and Gravitational
  Waves - Masha Baryakhtar (NYU)
DTSTART:20201029T160000Z
DTEND:20201029T170000Z
UID:TALK152257@talks.cam.ac.uk
CONTACT:Joseph Davighi
DESCRIPTION:*The seminar will take place via vidyo "here":https://indico.c
 ern.ch/event/968713/.\nThe explicit url is: https://indico.cern.ch/event/9
 68713/.*\n\nI will discuss how black holes can become nature's laboratorie
 s for new ultralight particles and ongoing observations of gravitational w
 aves can inform models of particle physics. When a particle's Compton wave
 length is comparable to the horizon size of a black hole\, energy and angu
 lar momentum from the black hole are converted into exponentially growing 
 clouds of bosons\, creating a gravitational atom in the sky. Theories beyo
 nd the Standard Model often include new\, light\, feebly interacting parti
 cles -- including the QCD axion -- whose discovery requires novel observat
 ions and search strategies. Previously open parameter space of axions can 
 be constrained by observations of rapidly spinning black holes. Such `grav
 itational atoms' can also source up to thousands of monochromatic gravitat
 ional wave signals\; searches are underway in current LIGO data\, enabling
  gravitational wave detectors to discover or exclude new particles. If the
  axions interact with one another\, instead of gravitational waves\, black
  holes populate the universe with axion waves that may be detectable in da
 rk matter searches.
LOCATION:Virtual Seminar 
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