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UID:2579@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20260601T030000
DTEND;TZID=Europe/Berlin:20260601T040000
DTSTAMP:20260527T091617Z
URL:https://qft.physik.hu-berlin.de/next-seminars/francisco-blanco-aei/
SUMMARY:Francisco Blanco (AEI) - 
DESCRIPTION:Regularization of self-fields in the gravitational two-body pro
 blem\n\nIn General relativity\, sufficiently small bodies are idealized as
  test particles moving along spacetime geodesics. This picture becomes ina
 dequate\, however\, once the object's own gravitational field is taken int
 o account. The self-force program resolves this by showing that compact ob
 jects still follow geodesic motion - not of the external spacetime\, but o
 f an effective metric that includes the influence of the object's self fie
 ld. The central technical challenge is that the self-field is singular at 
 the worldline and must be carefully regularized so that only its regular p
 iece contributes to the effective spacetime curvature. This construction i
 s now well understood through first order in the mass ratio and has only b
 een recently extended to second order.\n\nIn this talk\, I present a gener
 al framework that implements this principle nonperturbatively\, applicable
  to any covariant theory of gravity. Self-interaction effects are absorbed
  into systematic renormalizations of the object's stress energy tensor\, y
 ielding equations of motion in which even strongly self-gravitating bodies
  move as test objects in a regular effective metric. I conclude by showing
  how this formalism can be applied to study tidal effects on strongly self
 -interacting bodies as well as to the Hamiltonian description of the conse
 rvative piece of their dynamics.
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DTSTART:20260329T030000
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