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SUMMARY:The IKKT matrix model as a possible basis for 3+1-dimensional (qua
 ntum) gravity &amp\; cosmology - Harold Steinacker\, University of Vienna
DTSTART:20231115T140000Z
DTEND:20231115T150000Z
UID:TALK207928@talks.cam.ac.uk
CONTACT:Sergii Strelchuk
DESCRIPTION:The IKKT matrix model was introduced as a constructive definit
 ion of (some corner of) IIB string theory. We show that it also provides a
  mechanism for 3+1-dimensional gravity on suitable space-time branes\,  wi
 thout requiring compactification of target space. The Einstein-Hilbert act
 ion is obtained as  a quantum effect\, which is expected to dominate in an
  intermediate regime. At very long distances\, the bare Yang-Mills-type ac
 tion is dominant\, leading to significant deviations from general relativi
 ty at cosmic scales. Some aspects of this emergent gravity theory are disc
 ussed\, including the appearance of higher-spin fields.
LOCATION:MR2
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