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<font style="font-family: monospace;"><font size="+1"><em></em></font></font>Coalescing
binary black holes in the extreme mass ratio limit:<br>
comparison between analytical and numerical results
<br>
<br>
Alessandro Nagar<br>
Relativity and Gravitation Group, Politecnico di Torino, Italia<br>
<br>
Lloc: Seminari del Departament d'Astronomia i Astrofisica<br>
Dia: Dijous, 19 d'octubre 2006<br>
Hora: 12:00<br>
<br>
<br>
ABSTRACT: using black hole perturbation theory and Post-Newtonian
resummation <br>
techniques for the radiation-reaction force, we determine the
gravitational<br>
wave signature for the transition inspiral-plunge-ringdown for a binary
(non-spinning)
<br>
black hole system in the extreme mass ratio.<br>
We discuss energy, angular momentum and linear momentum losses and
focus <br>
on the mechanism of excitation of the black hole Quasi-Normal-Modes.
We <br>
propose analytical methods, based on Effective-One-Body ideas, to
reproduce <br>
the smooth transition between the inspiral and the ringdown phase of
the <br>
gravitational waveform. We show that the it is possible to build an
analytical<br>
"effective" waveform whose phase differs of less than 1% per cycle with
respect
<br>
to the actual signal. Implication for the equal mass black hole case
and gravitational<br>
wave detection are briefly discussed.<font face="Arial,Helvetica"></font>
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