[SEMINARI] Coalescing binary black holes... Alessandro Nagar

[Enric Marco]

//Coalescing binary black holes in the extreme mass ratio limit:
comparison between analytical and numerical results

Alessandro Nagar
Relativity and Gravitation Group, Politecnico di Torino, Italia

Lloc: Seminari del Departament d'Astronomia i Astrofisica
Dia: Dijous, 19 d'octubre 2006
Hora: 12:00


ABSTRACT: using black hole perturbation theory and Post-Newtonian 
resummation
techniques for  the  radiation-reaction force, we determine the 
gravitational
wave signature for the transition inspiral-plunge-ringdown for a binary 
(non-spinning)
black hole system in the extreme mass ratio.
We discuss energy, angular momentum and linear momentum losses and focus
on the mechanism of excitation of  the black hole Quasi-Normal-Modes. We
propose analytical methods, based on Effective-One-Body ideas, to reproduce
the smooth transition between the inspiral and the ringdown phase of the
gravitational waveform. We show that the it is possible to build an 
analytical
"effective" waveform whose phase differs of less than 1% per cycle with 
respect
to the actual signal. Implication for the equal mass black hole case and 
gravitational
wave detection are briefly discussed.


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