10th International Conference on Gravitation and Cosmology: New Horizons and Singularities in Gravity (ICGC 2023)

Improved eccentric models for binary black hole mergers with gauge-invariant definitions of orbital elements.

Not scheduled

15m

IIT Guwahati

Poster Gravitational Waves Gravitational Waves

Speaker

Mr Pratul Manna (Indian Institute of Technology Madras)

Description

In general relativity, eccentricity is not defined uniquely. Different waveform models rely on gauge-dependent definitions of eccentricity and other orbital elements, which leads to incompatibility between different models. We employ a recently proposed gauge invariant eccentricity definition to eliminate this ambiguity in our PN-NR comparisons. We also present an eccentric GW model by suitably joining an eccentric inspiral model, evolved assuming this new gauge-independent definition for orbital eccentricity, with a quasi-circular template. The model is calibrated against a set of long Inspiral-Merger-Ringdown (IMR) waveforms constructed by comparing spherical harmonic modes of PN and NR waveforms.