My research explores several areas in gravitational physics, with a current focus on gravitational-wave astronomy. Below are the main topics I work on.

  1. Figure for Defining eccentricity for GW astronomy

    Defining eccentricity for GW astronomy

    Defines a standard framework for measuring eccentricity in gravitational wave (GW) astronomy, along with methods to calculate eccentricity directly from gravitational waveforms.

    Read more

    In General Theory of Relativity, there is no unique way to define the eccentricity of a binary system's orbit. This can lead to ambiguity about the binary's eccentricity inferred from GW observations. In our works, we propose a standardized definition that relies solely on the gravitational waveforms, removing gauge ambiguity and model dependence. This standardized definition can be used to measure eccentricity from gravitational waveform emitted by binaries on generic bound orbits.

    A Python implementation of the method is available on GitHub: gw_eccentricity.

    Papers

    Collaborators

  2. Figure for Eccentricity Evolution Consistency Test (EECT)

    Eccentricity Evolution Consistency Test (EECT)

    A test to identify truly eccentric signal and discard eccentricity mimickers.

    Papers

    Collaborators

  3. Figure for Test of General Relativity using GWs

    Test of General Relativity using GWs

    The Inspiral-Merger-Ringdown Consistency Test (IMRCT) is a key tool for testing the validity of General Relativity (GR) using gravitational waves (GWs) emitted by compact binary systems. We extend this test to GW signals from eccentric binaries.

    Read more

    IMRCT meets eccentricity

    The IMRCT is usually performed using quasicircular template which assumes the binary's orbit to be circular. We first show that using quasicircular template for IMRCT on eccentric signals may lead to false violation of GR. We then show that when the IMRCT is performed using eccentric template such spurious violation of GR goes away. This emphasises the need for using eccentric templates when analysing GW data and performing test of GR using GW observations.

    Papers

    Collaborators

  4. Figure for Gravitational Lensing of GWs

    Gravitational Lensing of GWs

    We build fast and accurate surrogate model of microlensed gravitational wave, and probe nature of the lens using gravitational wave observations.

    Read more

    Fast and accurate microlensing template via surrogate modeling

    This study focuses on modeling the gravitational microlensing effect on gravitational waves (GWs) produced by different lens configurations.

    The microlensing effect is computed via a numerically expensive integration, making the generation of templates required for gravitational wave (GW) data analysis prohibitive. We circumvent this challenge by applying surrogate modeling techniques. The surrogate model enables fast and accurate generation of microlensed GW templates, making parameter estimation from GW observations feasible.

    Probing the nature of black holes using microlensing of GWs

    The research highlights the potential of gravitational wave microlensing as a tool to probe the properties and nature of the lens, offering new insights into the nature of the lens black hole.

    Papers

    Collaborators

  5. Figure for Early warning with GW higher modes

    Early warning with GW higher modes

    Papers

    Collaborators

  6. Figure for Black hole accretion and analogue gravity

    Black hole accretion and analogue gravity

    Papers

    Collaborators