Martedì 14 Aprile - Ore 12:00 Seminario - Dr. Alessandro Nagar - Modeling the dynamics of tidally-interacting binary neutron stars up to merger
Luogo: Sala Feynman
Relatore: Dr. Alessandro - NagarInstitut des Hautes Etudes Scientifiques, Bures-Sur-Yvette, FRANCE
E-mail organizzatore: roberto.depietri@fis.unipr.it
Abstract:
The data analysis of the gravitational wave signals emitted by coalescing neutron
star binaries requires the availability of an accurate analytical representation of
the dynamics and waveforms of these systems. We propose an effective-one-body (EOB)
model that describes the general relativistic dynamics of neutron star binaries from
the early inspiral up to merger. Our EOB model incorporates an enhanced attractive
tidal potential motivated by recent analytical advances in the post-Newtonian and
gravitational self-force description of relativistic tidal interactions. No fitting
parameters are introduced for the description of tidal interaction in the late,
strong-field dynamics. We compare the model energetics and the gravitational wave
phasing with new high-resolution multi-orbit numerical relativity simulations of
equal-mass configurations with different equations of state. We find agreement
within the uncertainty of the numerical data for all configurations. Our model is
the first semi-analytical model which captures the tidal amplification effects close
to merger. It thereby provides the most accurate analytical representation of binary
neutron star dynamics and waveforms currently available.