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SUMMARY:Mao Zeng - Gravitational waves and multi-loop scattering amplitude
 s - Mao Zeng (Edinburgh U.)
DTSTART:20230210T160000Z
DTEND:20230210T170000Z
UID:TALK194929@talks.cam.ac.uk
CONTACT:Maeve Madigan
DESCRIPTION:\nNext-generation gravitational wave detectors require highly 
 precise theoretical predictions for the dynamics of compact binary systems
 . In the initial inspiral phase where the black holes or neutron stars are
  far from each other\, general relativity can be treated perturbatively. S
 olving Einstein's equations classically is challenging due to the nonlinea
 r nature of gravity. As an alternative\, we achieve new advances by comput
 ing gauge-invariant scattering amplitudes in second-quantized Einstein gra
 vity and taking appropriate classical limits. Our methods are particularly
  effective in obtaining results in the post-Minkowskian expansion\, which 
 expands in the gravitational coupling constant without a further expansion
  around small velocities. Novel results include conservative two-body dyna
 mics through O(G^4) without spin and through O(G^3) with spin\, as well as
  dissipative dynamics such as energy loss. A variety of modern methods for
  scattering amplitudes\, including the double copy construction\, generali
 zed unitarity and loop integration methods developed in the context of col
 lider physics\, are harnessed to enable our calculations.
LOCATION:Potter Room (B1.19)
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