Poulami Dutta Roy
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View article: Implications of GW241011 for rotating exotic compact objects
Implications of GW241011 for rotating exotic compact objects Open
A number of theoretical proposals have been made for horizonless compact objects with masses and spins similar to those of black holes. While gravitational wave signatures from their mergers can resemble those of black holes, features like…
View article: Confronting general relativity with principal component analysis: Simulations and results from GWTC-3 events
Confronting general relativity with principal component analysis: Simulations and results from GWTC-3 events Open
We present a comprehensive assessment of multiparameter tests of general relativity (GR) in the inspiral regime of compact binary coalescences using principal component analysis (PCA). Our analysis is based on an extensive set of simulated…
View article: Identifying intermediate mass binary black hole mergers in AGN disks using LISA
Identifying intermediate mass binary black hole mergers in AGN disks using LISA Open
We show that Laser Interferometer Space Antenna can uniquely identify the sites of intermediate-mass binary black hole (IMBBH) mergers if they occur in Active Galactic Nuclei (AGN) disks with a gas density $\rho\geq10^{-12} \, {\rm g/cc}$ …
View article: Shadows of generalised Hayward spacetimes : in vacuum and with plasma
Shadows of generalised Hayward spacetimes : in vacuum and with plasma Open
We investigate the shadow properties of a wide class of spacetimes arising from different parameter regimes of the generalized Hayward metric, characterized by two independent parameters $(σ, κ)$ (Phys. Rev. D 106, 044028). This metric ext…
View article: Impact of unmodeled eccentricity on the tidal deformability measurement and implications for gravitational wave physics inference
Impact of unmodeled eccentricity on the tidal deformability measurement and implications for gravitational wave physics inference Open
With the expected large number of binary neutron star (BNS) observations through gravitational waves (GWs), third-generation GW detectors, Cosmic Explorer (CE) and Einstein Telescope (ET), will be able to constrain the tidal deformability,…
View article: Tests of general relativity at the fourth post-Newtonian order
Tests of general relativity at the fourth post-Newtonian order Open
The recently computed post-Newtonian (PN) gravitational-wave phasing up to 4.5PN order accounts for several novel physical effects in compact binary dynamics such as the {\it tail of the memory, tails of tails of tails and tails of mass he…
View article: Black holes in degenerate Einstein Gauss-Bonnet gravity: Can QNMs distinguish them from GR?
Black holes in degenerate Einstein Gauss-Bonnet gravity: Can QNMs distinguish them from GR? Open
In this study, for the first time, we analyse the quasinormal modes of black holes occurring within the framework of degenerate gravity. We investigate the properties of the asymptotically flat spacetimes introduced recently in [JCAP 02(20…
View article: Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes
Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes Open
View article: Generalised Hayward spacetimes: Geometry, matter and scalar quasinormal modes
Generalised Hayward spacetimes: Geometry, matter and scalar quasinormal modes Open
Bardeen's 1968 idea of a regular black hole spacetime was revived by Hayward in 2006 through the construction of a new example of such a geometry. Later it was realised by Neves and Saa, that a wider, two-parameter class exists, with Barde…
View article: Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes
Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes Open
We study the behavior of a specific Lorentzian wormhole family under gravitational perturbations. In earlier work [EPJC 80, 850 (2020)], we have proved the stability of a test scalar field in the background of the wormhole family, where th…
View article: A new model with solitary waves: solution, stability and quasinormal modes
A new model with solitary waves: solution, stability and quasinormal modes Open
View article: Revisiting a family of wormholes: geometry, matter, scalar quasinormal modes and echoes
Revisiting a family of wormholes: geometry, matter, scalar quasinormal modes and echoes Open
View article: Quasi-normal modes in a symmetric triangular barrier
Quasi-normal modes in a symmetric triangular barrier Open
View article: Scalar quasinormal modes of a family of generalised Ellis--Bronnikov wormholes
Scalar quasinormal modes of a family of generalised Ellis--Bronnikov wormholes Open
We obtain the scalar quasinormal modes (QNMs) in a family of Lorentzian wormholes proposed many years ago, as a possible generalisation of the well--known Ellis-Bronnikov spacetime. The effective potentials governing wave propagation, for …