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CATEGORIES:Theoretical Physics Colloquium
SUMMARY:Self-force approach to the two-body problem in GR
- Leor Barack (University of Southampton)
DTSTART;TZID=Europe/London:20161130T141500
DTEND;TZID=Europe/London:20161130T151500
UID:TALK68144AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/68144
DESCRIPTION:The radiative dynamics in a gravitationally-bound
two-body system with a small mass ratio can be des
cribed using a perturbative approach whereby corre
ctions to the geodesic motion of the smaller objec
t (due to radiation reaction\, internal structure\
, etc.) are accounted for order by order in the ma
ss ratio\, invoking the notion of ``gravitational
self-force''. The ongoing experimental effort to d
etect gravitational waves has in the past two deca
des motivated a program to obtain a rigorous formu
lation of the self-force and apply it numerically
to describe the gravitational-wave signature of re
levant inspiralling compact objects. I will review
the theory of gravitational self-force in curved
spacetime\, describe how this theory is being impl
emented today in actual calculations\, and discuss
current frontiers. I will show results from rece
nt calculations of gauge-invariant post-geodesic e
ffects (like the finite-mass corrections to the ra
tes of periastron advance and spin precession)\, a
nd highlight the way in which such calculations al
low us to make a fruitful contact with other appro
aches to the two-body problem.
LOCATION:MR2\, Centre for Mathematical Sciences
CONTACT:Shahar Hadar
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