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SUMMARY:Extreme-mass-ratio binaries: Modelling and test of Chern-Simons Mo
 dified Gravity - Priscilla Canizares (IoA)
DTSTART:20120502T121500Z
DTEND:20120502T124500Z
UID:TALK35927@talks.cam.ac.uk
CONTACT:Ben Davies
DESCRIPTION:Binary systems with extreme-mass ratio are one of the most pro
 mising sources of Gravitational-Waves (GWs) for space-based detectors like
  LISA (the Laser Interferometer Space Antenna). These binaries provide lon
 g and complex GW waveforms\, whose phase and timing are determined by the 
 orbit of the SCO in the MBH background geometry. Their detection will offe
 r the possibility of exploring the strong gravitational field in the vicin
 ity of the MBH and simultaneously test the theory of gravity governing the
  system. In this regard\, the development of a practical methodology for c
 omputing the generation and propagation of GWs in theories of gravity diff
 erent from General Relativity (GR) has only recently begun. In this talk\,
  we give a general overview about the main features of Extreme-Mass-Ratio 
 Inspirals (EMRIs) and present a first parameter estimation analysis to det
 ermine to what extent a space-based GW observatory like LISA could disting
 uish between GR and other alternative theory of gravity. In particular\, w
 e focus on a modified theory of gravity parametrized by a four-dimensional
  Chern-Simons (CS) gravitational term. We model the motion of the SCO as e
 volving geodesics including Radiation-Reaction (RR) effects and the GWs ar
 e described with a multipolar formalism up to quadrupolar order. We use th
 ese model waveforms to study a five-dimensional space of capture-event par
 ameters\, including the CS parameter\, finding that a GW detector like LIS
 A could discriminate between GR and Dynamical Chern-Simons modified theory
  within a fractional error of ~10E-2\, which is three orders of magnitude 
 better than current Solar System bounds.\n
LOCATION:Sackler Lecture Theatre\, IoA
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