Saibal Ray
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View article: Observational constraints on f(Q,T) gravity from the mass-radius relation and stability of compact stars
Observational constraints on f(Q,T) gravity from the mass-radius relation and stability of compact stars Open
In this investigation we examine the astrophysical consequences of the influence of pressure anisotropy on the physical properties of observed pulsars within the background of $f(Q,T)$ gravity by choosing a specific form $f(Q, T)=ψ_1\, Q +…
View article: Antibacterial Potential of Nanocrystalline Zinc–Cobalt Ferrite
Antibacterial Potential of Nanocrystalline Zinc–Cobalt Ferrite Open
Purpose: The synthesis of nanoscale particles with antibacterial properties has garnered significant attention in pharmaceutical research, driven by the escalating threat of antibiotic-resistant bacteria. This study investigates the antiba…
View article: Observational constraints on holography in $(2 + 1)$-dimensional cosmology with a generalized equation of state
Observational constraints on holography in $(2 + 1)$-dimensional cosmology with a generalized equation of state Open
In this study we explore the cosmic holographic principle, as proposed by Fischler and Susskind~\cite{Fischler}, within the framework of $(2 + 1)$-dimensional cosmological models. A generalized equation of state is employed, given by $p = …
View article: Relativistic massive compact stars supported by decoupled matter: Implications for mass-radius bounds
Relativistic massive compact stars supported by decoupled matter: Implications for mass-radius bounds Open
The merger of binary neutron stars (BNSs) is a remarkable astrophysical event where all four fundamental forces interplay dynamically across multiple stages, producing a rich spectrum of multi-messenger signals. These observations present …
View article: Testing of QPOs, particle dynamics, emission energy and thermal fluctuation around a regular hairy black hole
Testing of QPOs, particle dynamics, emission energy and thermal fluctuation around a regular hairy black hole Open
We investigate the dynamics of test particles around a spherically symmetric, non-rotating, hairy regular black hole, examining how the model parameters affect particle motion. The black hole is characterized by two parameters, the mass $$…
View article: Accretion onto a Schwarzschild-like black hole in Einstein-Grisaru-Zanon gravity
Accretion onto a Schwarzschild-like black hole in Einstein-Grisaru-Zanon gravity Open
We investigate the matter accretion of well-known fluids flowing onto a Schwarzschild-like black hole in Einstein–Grisaru–Zanon (EGZ) gravity. Within the framework of EGZ gravity, we can determine the accretion properties of fluids that ha…
View article: Global Response of Vertical Total Electron Content to Mother’s Day G5 Geomagnetic Storm of May 2024: Insights from IGS and GIM Observations
Global Response of Vertical Total Electron Content to Mother’s Day G5 Geomagnetic Storm of May 2024: Insights from IGS and GIM Observations Open
The G5 geomagnetic storm of May 2024 provided a significant opportunity to investigate global ionospheric disturbances using vertical total electron content (VTEC) data derived from 422 GNSS-IGS stations and GIM. This study presents a comp…
View article: Observational analysis of bulk viscous modified Chaplygin gas in (2+1)-dimensional universe using MCMC
Observational analysis of bulk viscous modified Chaplygin gas in (2+1)-dimensional universe using MCMC Open
This paper investigates regarding cosmological implications of a bulk viscous modified Chaplygin gas (MCG) in (2+1)-dimensional Friedmann-Robertson-Walker spacetime, incorporating both theoretical analysis and observational constraints. We…
View article: Cosmological model in the framework of $f(R,\mathcal{L}_{m})$ gravity with quadratic equation of state parameter
Cosmological model in the framework of $f(R,\mathcal{L}_{m})$ gravity with quadratic equation of state parameter Open
In this study, we have explored a transitioning cosmological model of universe's expansion in $f(R,\mathcal{L}_{m})$ gravity. The quadratic type of equation of state parameter in the form $ω=-1 + α(1 + z) + β(1 + z)^2$, where $α$ and $β$ a…
View article: Investigation of the Ionospheric Effects of the Solar Eclipse of April 8, 2024 Using Multi-Instrument Measurements
Investigation of the Ionospheric Effects of the Solar Eclipse of April 8, 2024 Using Multi-Instrument Measurements Open
Solar eclipses present a valuable opportunity for controlled in situ ionosphere studies. This work explores the response of the upper atmosphere’s F-layer during the total eclipse of 8 April 2024, which was primarily visible across North a…
View article: Anisotropic Compact Stars in General Relativity: An Exact Self-Bound Analytical Solution for Stellar Systems
Anisotropic Compact Stars in General Relativity: An Exact Self-Bound Analytical Solution for Stellar Systems Open
In the present work, we investigate anisotropic compact stars under the general relativistic platform. Following a novel technique, we found an exact self-bound analytical stellar solution. The obtained solution was matched on the spherica…
View article: Role of gravitational decoupling on theoretical insights of relativistic massive compact stars in the mass gap
Role of gravitational decoupling on theoretical insights of relativistic massive compact stars in the mass gap Open
Advancements in theoretical simulations of mass gap objects, particularly those resulting from neutron star mergers and massive pulsars, play a crucial role in addressing the challenges of measuring neutron star radii. In the light of this…
View article: Investigation of the Ionospheric Effects of the Solar Eclipse of April 8, 2024 Using Multi-Instrument Measurements
Investigation of the Ionospheric Effects of the Solar Eclipse of April 8, 2024 Using Multi-Instrument Measurements Open
Solar eclipses present a valuable opportunity for controlled in-situ ionosphere studies. This work explores the response of the upper atmosphere’s F-layer during the total eclipse of April 8, 2024, which was primarily visible across North …
View article: Posterior Positivity Distribution Analysis of Subclinical Bluetongue in the Eastern and North-Eastern States of India: A Wakeup Call for Outbreak Preparedness
Posterior Positivity Distribution Analysis of Subclinical Bluetongue in the Eastern and North-Eastern States of India: A Wakeup Call for Outbreak Preparedness Open
Bluetongue (BT) is considered endemic in the southern states of India, with sporadic incidences reported from the northern, western and central parts of India. However, the eastern and north-eastern states of India have not experienced act…
View article: Behavioral Retail Operations: Tactics to Win Customers
Behavioral Retail Operations: Tactics to Win Customers Open
Shoppers face numerous decisions about which products to purchase, as the number of available options grows. To navigate this complexity, retailers deploy a range of tactics aimed at influencing customer behavior and guiding them toward sp…
View article: Physical characteristics of anisotropic solutions in f(Q,T) gravity under the vanishing complexity, embedding class one, conformally flat and conformally Killing conditions
Physical characteristics of anisotropic solutions in f(Q,T) gravity under the vanishing complexity, embedding class one, conformally flat and conformally Killing conditions Open
The foundation of this paper is to present a comparative study of the properties of anisotropic solutions for compact stars in the framework of modified f(Q,T) gravity for the first time under the schemes of vanishing complexity, embedding…
View article: Modeling Compact Object Mergers GW190814 and GW200210 and Other Self-bound Compact Stars with Dark Matter Induced by Gravitational Decoupling and Its Significance to the Mass Gap
Modeling Compact Object Mergers GW190814 and GW200210 and Other Self-bound Compact Stars with Dark Matter Induced by Gravitational Decoupling and Its Significance to the Mass Gap Open
We present a rigorous study of compact objects within f ( Q ) gravity where electrical fields and dark matter are studied and provide novel mass–radius relations with models falling in the mass gap of the events GW190814 and GW200210. Afte…
View article: Circular orbits and accretion disk around AdS black holes surrounded by dark fluid with Chaplygin-like equation of state
Circular orbits and accretion disk around AdS black holes surrounded by dark fluid with Chaplygin-like equation of state Open
In the present work we study the geodesic motion and accretion process of a test particle near an Anti-de Sitter (ADS) BH surrounded by a dark fluid with a Chaplygin-like equation. Within the defined paradigm, we investigate on the equator…