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CATEGORIES:Institute of Astronomy Seminars
SUMMARY:Extreme-mass-ratio binaries: Modelling and test of
Chern-Simons Modified Gravity - Priscilla Canizar
es (IoA)
DTSTART;TZID=Europe/London:20120502T131500
DTEND;TZID=Europe/London:20120502T134500
UID:TALK35927AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/35927
DESCRIPTION:Binary systems with extreme-mass ratio are one of
the most promising sources of Gravitational-Waves
(GWs) for space-based detectors like LISA (the Las
er Interferometer Space Antenna). These binaries p
rovide long and complex GW waveforms\, whose phase
and timing are determined by the orbit of the SCO
in the MBH background geometry. Their detection w
ill offer the possibility of exploring the strong
gravitational field in the vicinity of the MBH and
simultaneously test the theory of gravity governi
ng the system. In this regard\, the development of
a practical methodology for computing the generat
ion and propagation of GWs in theories of gravity
different from General Relativity (GR) has only re
cently begun. In this talk\, we give a general ove
rview about the main features of Extreme-Mass-Rati
o Inspirals (EMRIs) and present a first parameter
estimation analysis to determine to what extent a
space-based GW observatory like LISA could disting
uish between GR and other alternative theory of gr
avity. In particular\, we focus on a modified theo
ry of gravity parametrized by a four-dimensional C
hern-Simons (CS) gravitational term. We model the
motion of the SCO as evolving geodesics including
Radiation-Reaction (RR) effects and the GWs are de
scribed with a multipolar formalism up to quadrupo
lar order. We use these model waveforms to study a
five-dimensional space of capture-event parameter
s\, including the CS parameter\, finding that a GW
detector like LISA could discriminate between GR
and Dynamical Chern-Simons modified theory within
a fractional error of ~10E-2\, which is three orde
rs of magnitude better than current Solar System b
ounds.\n
LOCATION:Sackler Lecture Theatre\, IoA
CONTACT:Ben Davies
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