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SUMMARY:Lydia Bieri (University of Michigan\, Ann Arbor)
DTSTART:20201203T143000Z
DTEND:20201203T153000Z
DTSTAMP:20260423T041614Z
UID:jomarec/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/jomarec/3/">
 New structures in gravitational radiation</a>\nby Lydia Bieri (University 
 of Michigan\, Ann Arbor) as part of JoMaReC - Joint Online Mathematical Re
 lativity Colloquium\n\n\nAbstract\nGravitational waves are transporting in
 formation from faraway regions of the Universe. A new era began with the f
 irst detection of gravitational waves by Advanced LIGO in September 2015\,
  and since then several events have been recorded by the LIGO/VIRGO collab
 oration. New challenges await us to unravel the interesting interplay betw
 een physics\, astrophysics and mathematics. Most studies so far have been 
 devoted to sources like binary black hole mergers or neutron star mergers\
 , or generally to sources that are stationary outside of a compact set. We
  describe these systems by asymptotically-flat manifolds solving the Einst
 ein equations. These sources have in common that far away their gravitatio
 nal field decays fast enough towards Minkowski spacetime. In particular\, 
 far away from the source\, the decay behavior can be described by a term t
 hat is homogeneous of degree -1 and lower order terms. I will present new 
 results on gravitational radiation for sources that are not stationary out
 side of a compact set\, but whose gravitational fields decay more slowly t
 owards infinity. A panorama of new gravitational effects opens up when del
 ving deeper into these more general spacetimes. In particular\, whereas th
 e former sources produce memory effects that are of purely electric parity
  (permanent displacement only)\, the latter in addition generate memory of
  magnetic type\, thus allowing for rotation in the system. These new effec
 ts emerge naturally from the Einstein equations.\n
LOCATION:https://researchseminars.org/talk/jomarec/3/
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