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Measuring Eccentricity from Gravitational Waveform

05/11 2023 Seminar
  • Title Measuring Eccentricity from Gravitational Waveform
  • Speaker Md Arif Shaikh (Seoul National University)
  • Date 10:00 May 11, 2023
  • Venue Onsite: 6420, South Building Online: Tencent No.:213-935-210
  • Abstract
     Eccentric compact binary mergers are significant scientific targets for current and future gravitational wave observatories. To detect and analyze eccentric signals, there is an increasing effort to develop waveform models, numerical relativity simulations, and parameter estimation frameworks for eccentric binaries. Unfortunately, current models and simulations adopt different internal parameterisations of eccentricity in the absence of a unique natural definition of eccentricity in general relativity, which can result in incompatible eccentricity measurements. In this work, we propose a standard definition of eccentricity and mean anomaly based solely on waveform quantities. This definition is free of gauge ambiguities, has the correct Newtonian limit, and can be applied as a postprocessing step when comparing eccentricity measurements from different models. This standardization puts all models and simulations on the same footing and enables direct comparisons between eccentricity estimates from gravitational wave observations and astrophysical predictions. We demonstrate the applicability of our definition for waveforms of different origins, including post-Newtonian theory, effective-one-body, extreme mass ratio inspirals, and numerical relativity simulations. We focus on binaries without spin-precession in this work, but possible generalizations to spin-precessing binaries will be discussed. Our implementation is publicly available through an easy-to-use Python package, gw_eccentricity
    Reference: arXiv:2302.11257
    Md Arif Shaikh is a postdoctoral researcher at Seoul National University. He received his PhD in Astrophysics from Harish-Chandra Research Institute (HRI) in India in 2019. Previously, he was a postdoc at the International Centre for Theoretical Sciences (ICTS-TIFR), India where he worked with the Astrophysical Relativity group from 2019 to 2022. He is interested in various areas of gravitational wave physics and astronomy, including waveform modeling, numerical relativity simulations of binary black holes and gravitational wave data analysis. He is a member of the LIGO Scientific Collaboration (LSC) and the Simulating eXtreme Spacetime (SXS) collaboration. To know more about his current research activities, please visit
    Shao-Jiang Wang