Importance of transient resonances in extrememassratio inspirals
Abstract
The inspiral of stellarmass compact objects, like neutron stars or stellarmass black holes, into supermassive black holes provides a wealth of information about the strong gravitationalfield regime via the emission of gravitational waves. In order to detect and analyze these signals, accurate waveform templates which include the effects of the compact object's gravitational selfforce are required. For computational efficiency, adiabatic templates are often used. These accurately reproduce orbitaveraged trajectories arising from the firstorder selfforce, but neglect other effects, such as transient resonances, where the radial and poloidal fundamental frequencies become commensurate. During such resonances the flux of gravitational waves can be diminished or enhanced, leading to a shift in the compact object's trajectory and the phase of the waveform. We present an evolution scheme for studying the effects of transient resonances and apply this to an astrophysically motivated population. We find that a large proportion of systems encounter a loworder resonance in the later stages of inspiral; however, the resulting effect on signaltonoise recovery is small as a consequence of the low eccentricity of the inspirals. Neglecting the effects of transient resonances leads to a loss of 4% of detectable signals.
 Publication:

Physical Review D
 Pub Date:
 December 2016
 DOI:
 10.1103/PhysRevD.94.124042
 arXiv:
 arXiv:1608.08951
 Bibcode:
 2016PhRvD..94l4042B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 24 pages, 12 figures, 2 appendices