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SUMMARY:Ultralight bosons in strong gravitational fields  - Nils Siemonsen
  (Perimeter Institute)
DTSTART:20211112T130000Z
DTEND:20211112T140000Z
UID:TALK164074@talks.cam.ac.uk
CONTACT:Justin Ripley
DESCRIPTION:Particle physics models of dark matter\, certain extensions to
  the Standard Model\, and low energy limits of models of quantum gravity\,
  predict the existence of an abundance of ultralight degrees of freedom in
  the universe. Gravitational wave observations can be used to probe this d
 ark sector indirectly. Black hole superradiance\, the process in which a b
 lack hole's rotational energy is converted into a self-gravitating bosonic
  cloud\, leads to the emission of strong approximately monochromatic gravi
 tational radiation. We discuss the superradiance instability\n timescales\
 , possible gravitational wave signatures and associated search strategies.
  Strong field dynamics of isolated or binary boson stars may be another wa
 y gravitational wave observations can probe the existence of new bosonic p
 articles. These clumps of energy\, forming via gravitational cooling from 
 a large abundance of ultralight bosons\, can become more compact than neut
 ron stars\, and hence\, also pose as excellent candidates to\ntest the bla
 ck hole paradigm. We discuss boson star formation\, stability and possible
  non-linear dynamics\, focusing particularly on the more compact rotating 
 stars.
LOCATION:Zoom
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