Saurya Das
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View article: Power-law bounces in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>f</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mi>R</mml:mi> <mml:mo stretchy="false">)</mml:mo> </mml:math> gravity: Analysis of the ekpyrosis and accelerating regimes
Power-law bounces in gravity: Analysis of the ekpyrosis and accelerating regimes Open
We investigate the dynamics of the Friedmann-Lemaître-Robertson-Walker spacetime within the framework of $f(R)$ gravity using a compact, model-independent dynamical systems approach. By assuming a power-law scale factor, we explore ekpyrot…
View article: Testing the quantum equivalence principle with gravitational waves
Testing the quantum equivalence principle with gravitational waves Open
We study modifications of gravitational wave observables, such as the wave amplitude and frequency, which follow from the quantum equivalence principle, and are expressed in terms of the inertial, gravitational and rest masses of the LIGO/…
View article: Baryonic Ecosystem IN Galaxies (BEINGMgII)
Baryonic Ecosystem IN Galaxies (BEINGMgII) Open
We search for the galaxies associated with the intervening Mg II absorbers over a redshift range of 0.4 ≤ z ≤ 1 using imaging data from DESI Legacy Imaging Surveys and measure the redshift based on the direct detection of nebular emission …
View article: Baryonic Ecosystem IN Galaxies (BEINGMgII)
Baryonic Ecosystem IN Galaxies (BEINGMgII) Open
Context. We study the galaxies hosting ultra-strong Mg II (USMgII) absorbers at small impact parameters of ∼2″ (5−20 kpc) spanning a redshift range of 0.4 ≤ z ≤ 1.7 using deep high-resolution images from the Hyper Suprime-Cam Subaru Strate…
View article: Baryonic Ecosystem in Galaxies (BEINGMgII). Host Galaxies of Ultra-strong MgII Absorbers in Subaru Hyper Suprime-Cam Survey
Baryonic Ecosystem in Galaxies (BEINGMgII). Host Galaxies of Ultra-strong MgII Absorbers in Subaru Hyper Suprime-Cam Survey Open
We study the galaxies hosting ultra-strong MgII (USMgII) absorbers at small impact parameters of $\sim$2" (5 - 20 kpc), spanning a redshift range of $0.4 \le z \le 1.7$, using deep, high-resolution images from Hyper Suprime-Cam Subaru Stra…
View article: A singularity free classical theory of gravity
A singularity free classical theory of gravity Open
We present a classical theory of gravity, which is singularity free at short distances and reduces to General Relativity at large distances. We discuss its implications.
View article: Varying Newton's constant: a cure for gravitational maladies?
Varying Newton's constant: a cure for gravitational maladies? Open
We show that a slowly varying Newton's constant, consistent with existing bounds, can potentially explain a host of observations pertaining to gravitational effects or phenomena across distances spanning from planetary to the cosmological,…
View article: Baryonic Ecosystem in Galaxies (BEINGMgII) -- II. Unveiling the Nature of Galaxies Harboring Cool Gas Reservoirs
Baryonic Ecosystem in Galaxies (BEINGMgII) -- II. Unveiling the Nature of Galaxies Harboring Cool Gas Reservoirs Open
We search for the galaxies associated with the intervening MgII absorbers over a redshift range of $0.4 \le z \le 1.0$ using imaging data from DESI Legacy Imaging Surveys and measure the redshift based on direct detection of nebular emissi…
View article: Superradiance of anyons
Superradiance of anyons Open
In this paper, we investigate superradiance of anyons from a (2+1)-dimensional Bañados, Teitelboim and Zanelli (BTZ) black hole. Our analysis demonstrates that the superradiance condition for anyons mirrors that of a neutral scalar field w…
View article: Cosmological Singularity and Power-Law Solutions in Modified Gravity
Cosmological Singularity and Power-Law Solutions in Modified Gravity Open
A bouncing Universe avoids the big-bang singularity. Using the time-like and null Raychaudhhuri equations, we explore whether the bounce near the big-bang, within a broad spectrum of modified theories of gravity, allows for cosmologically …
View article: Feasibility analysis of a proposed test of quantum gravity via optical magnetometry in xenon
Feasibility analysis of a proposed test of quantum gravity via optical magnetometry in xenon Open
We present an analysis of the sensitivity limits of a proposed experimental\nsearch for quantum gravity, using a novel approach based on optical\nmagnetometry in the noble gas isotope $^{129}$Xe. The analysis relies on a\ngeneral uncertain…
View article: General formalism of the quantum equivalence principle
General formalism of the quantum equivalence principle Open
A consistent theory of quantum gravity will require a fully quantum formulation of the classical equivalence principle. Such a formulation has been recently proposed in terms of the equality of the rest, inertial and gravitational mass ope…
View article: General Formalism of the Quantum Equivalence Principle
General Formalism of the Quantum Equivalence Principle Open
A consistent theory of quantum gravity will require a fully quantum formulation of the classical equivalence principle. Such a formulation has been recently proposed in terms of the equality of the rest, inertial and gravitational mass ope…
View article: Constraining quantum fluctuations of spacetime foam from BBN
Constraining quantum fluctuations of spacetime foam from BBN Open
A possibility to describe quantum gravitational fluctuations of the spacetime background is provided by virtual $D$-branes. These effects may induce a tiny violation of the Lorentz invariance (as well as a possible violation of the equival…
View article: Discriminating quantum gravity models by gravitational decoherence
Discriminating quantum gravity models by gravitational decoherence Open
Several phenomenological approaches to quantum gravity predict the existence of a minimal measurable length and/or a maximum measurable momentum near the Planck scale. When embedded into the framework of quantum mechanics, such constraints…
View article: Gravitational lensing and missing mass
Gravitational lensing and missing mass Open
The mass of an astrophysical object can be estimated by the amount of gravitational lensing of another object that it causes. To arrive at the estimation however, one assumes the validity of the inverse square law of gravity, or equivalent…
View article: Gravitational lensing and missing mass
Gravitational lensing and missing mass Open
The mass of an astrophysical object can be estimated by the amount of gravitational lensing of another object that it causes. To arrive at the estimation however, one assumes the validity of the inverse square law of gravity, or equivalent…
View article: Information recovery from evaporating rotating charged black holes
Information recovery from evaporating rotating charged black holes Open
In classical gravity, nothing can escape from a black hole, not even light.In particular, this happens for stationary black holes because their horizons are null.We show, on the other hand, that the apparent horizon and the region near r =…
View article: GUP Corrections to the Jaynes-Cummings Model
GUP Corrections to the Jaynes-Cummings Model Open
The Generalized Uncertainty Principle (GUP) is a modification of Heisenberg's Uncertainty Principle predicted by several theories of quantum gravity. In this work, we compute GUP corrections to the well-known Jaynes-Cummings Model (JCM) wi…