28 citations · 78 across the 29 of their papers we have counts for
29 papers
Analysis of radial and quasiradial oscillations in quark stars for different equations of state
Nivamani Rajbongshi, Umananda Dev Goswami
We investigate quark stars (QSs) described by three quark matter (QM)equations of state (EoSs) and analyse their radial and quasiradial oscillation modes within the slowly rotating…
Lensing Signatures of a Primary Hair Black Hole Solution
Rahul Das, Umananda Dev Goswami
We investigate the weak and strong field gravitational lensing of light by a primary hair black hole (BH) solution obtained within the framework of the gravitational decoupling (GD…
NuSTAR View of the 2025 Mini-Outburst of the Black Hole X-ray Binary GRS 1739-278: Spectral and Timing Evolution in the Soft State
Arshad Hussain, Umananda Dev Goswami
We present a dedicated timing and spectral analysis of three NuSTAR observations of the Galactic black hole candidate GRS 1739-278 obtained during the decay of its 2025 mini-outbur…
Reconstructing the Auger UHECR Dipole: A Hybrid Analysis of 4LAC AGNs and Nearby Starburst Galaxies
Swaraj Pratim Sarmah, Umananda Dev Goswami, Sovan Chakraborty
The large-scale dipole anisotropy observed by the Pierre Auger Observatory above ~EeV provides important clues about the origin of ultra-high-energy cosmic rays (UHECRs). In thi…
Five-Dimensional Traversable Wormholes in Einstein-Gauss-Bonnet Gravity with a Cloud of Strings
Jaydeep Goswami, Umananda Dev Goswami
We present an exact static and spherically symmetric traversable wormhole solution in 5D Einstein-Gauss-Bonnet (EGB) gravity supported by a Letelier cloud of strings. The physicall…
A systematic comparison of green valley selection criteria across multiparameter spaces using a homogeneous ultraviolet-optical dataset
Pius Privatus, Umananda Dev Goswami
We present a systematic comparison of commonly adopted green valley (GV) selection criteria by examining their distributions across multiple observational and physical parameter sp…
Strong field lensing and shadows of gravity black holes
Rahul Das, Umananda Dev Goswami
We investigate the strong field lensing of light by black holes (BHs)emerging in theory of gravity, which is an extension of gravity theory by including…
Probing CDM-mimicking gravity model using gravitational waves from compact binary coalescences
Sikha Gogoi, Umananda Dev Goswami
The direct detection of gravitational waves (GWs) is a very significant achievement in the history of physics and has opened a new window to probe the possible deviations of physic…
Traversable wormholes in gravity: Energy conditions, stability and quasinormal modes
Jaydeep Goswami, Rupam Jyoti Borah, Umananda Dev Goswami
We investigate static and spherically symmetric traversable wormhole solutions in the framework of gravity by considering a power-law model of the form . By ad…
Perturbative Renormalisation Group Improved Black Hole Solution and its Quasinormal Modes
Rupam Jyoti Borah, Umananda Dev Goswami
In this work, we construct a perturbative black hole (BH) solution motivated by renormalization group (RG) improvement and investigate the quasinormal modes (QNMs) of the BH under…
Black Hole Quasi-Periodic Oscillations in the Presence of Gauss-Bonnet Trace Anomaly
Rupam Jyoti Borah, Umananda Dev Goswami
We investigate the effects of the Gauss-Bonnet (GB) gravitational trace anomaly on the circular motion of test particles around black holes (BHs) and its implications for quasi-per…
Mapping Nearby Galaxies with Apache Point Observatory: Group and field galaxies' morphologies in the colour-magnitude plane
Pius Privatus, Umananda Dev Goswami
This study involves the use of integral field spectroscopy (IFS) data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) to investigate whether the morphology influen…
Quasinormal Modes and Shadows of Black Holes in Infinite Derivative Theory of Gravity
Rupam Jyoti Borah, Umananda Dev Goswami
In this work, we study the quasinormal modes (QNMs) and shadow of a Schwarzschild black hole (BH) with higher-order metric corrections, in the framework of the Infinite Derivative…
Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory
Swaraj Pratim Sarmah. Pranjal Sarmah, Umananda Dev Goswami
We explore the effects of Bumblebee gravity on the propagation of ultra-high energy cosmic rays (UHECRs) using astrophysical sources modelled in the Unger-Farrar-Anchordoqui (UFA)…
Strong Lensing Effect and Quasinormal Modes of Oscillations of Black Holes in Gravity Theory
Gayatri Mohan, Ronit Karmakar, Rupam Jyoti Borah +1
In this work, we analyze the strong lensing phenomenon and quasinormal modes (QNMs) in the case of black holes (BHs) surrounded by fluids within the framework of gravity,…
Analysis of the Effect of Bars on Environmental Dependence of Disc Galaxies with MaNGA Survey Data
Pius Privatus, Umananda Dev Goswami
Bars are fundamental structures in disc galaxies, although their role in galaxy evolution is still not fully known. This study investigates the effect of the presence of bars on th…
Phase space analysis of Bianchi III Universe with gravity theory
Pranjal Sarmah, Umananda Dev Goswami
The Bianchi type III (BIII) metric is a useful geometry to study cosmic anisotropies. It includes an extra exponential term multiplied by a directional scale factor and recasts the…
Investigating the effects of gravitational lensing by Hu-Sawicki gravity black holes
Gayatri Mohan, Nashiba Parbin, Umananda Dev Goswami
In this work, gravitational lensing in the weak and strong field limits is investigated for black hole spacetime within the framework of Hu-Sawicki gravity. We employ the Is…
Modelling Cosmic Rays Flux with Pierre Auger and Telescope Array Data in and Theories of Gravity
Swaraj Pratim Sarmah, Umananda Dev Goswami
We investigate the effects of the magnetic field and the redshift on the propagation of galactic and extragalactic cosmic rays (CRs) in a modified theory of gravity (MTG) and an al…
Observational constraints on cosmological parameters in the Bianchi type III Universe with f(R,T) gravity theory
Pranjal Sarmah, Umananda Dev Goswami
Bianchi type III (BIII) metric is an interesting anisotropic model for studying cosmic anisotropy as it has an additional exponential term multiplied to a directional scale factor.…
Anisotropic cosmology in Bumblebee gravity theory
Pranjal Sarmah, Umananda Dev Goswami
The Bumblebee vector model of spontaneous Lorentz symmetry breaking (LSB) in Bianchi type I (BI) Universe to observe its effect on cosmological evolution is an interesting aspect o…
Quasinormal modes, thermodynamics and shadow of black holes in Hu-Sawicki f(R) gravity theory
Ronit Karmakar, Umananda Dev Goswami
We derive novel black hole solutions in a modified gravity theory, namely the Hu-Sawicki model of gravity. After obtaining the black hole solution, we study the horizon radi…
Main sequence of star formation and colour bimodality considering galaxy environment
Pius Privatus, Umananda Dev Goswami
This study involves the use of friend-of-friend method on the volume limited samples constructed from the Sloan Digital Sky Survey Data Release 12 (SDSS DR12) to classify the galax…
Dynamical system analysis of LRS-BI Universe with f(Q) gravity theory
Pranjal Sarmah, Umananda Dev Goswami
Considering the Universe as a dynamic system, the understanding of its evolution is an interesting aspect of study in cosmology. Here, we investigate the anisotropic locally rotati…