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"Coalescing black hole binaries: bridging the gap between analytical (Effective-One-Body) models and Numerical Relativity simulations."

Relatore: Dr. Alessandro Nagar- IHES (Parigi) & INFN Torino

Sala Feyman
25 Febbraio 2009 ore 10.30

Coalescing black hole binaries are expected to be among the most promising sources for currently operating ground-based gravitational wave detectors like LIGO/GEO/Virgo. Recent advances in the numerical methods to simulate black hole systems in general relativity have for the first time allowed simulations of complete orbits of two black holes. This opens the possibility to study black hole systems during the most dynamic, non-linear phase of their inspiral,collision, and merger, as well as to provide crucial information (i.e. template waveforms) needed for gravitational wave detection. However, due to the computational cost of each simulation, it is unlikely that Numerical Relativity is able to densely cover the full parameter space. To this aim, one must devise analytical methods to accurately compute waveforms. The Effective-One-Body (EOB) approach to the general relativistic two-body dynamics has proven effective in modeling analytically the full coalescence process (i.e., inspiral, plunge, merger and ringdown) and has succeeded in bridging the gap between numerical and analytical knowledge. I will review the state of the art and present the most recent and exciting results about how the how the EOB analytical knowledge can be completed by extracting crucial non-perturbative information out of accurate numerical data. This will show that the EOB formalism is a very promising route to provide accurate representations of general relativistic waveforms which are needed by gravitational wave detectors.