Arunava Bhadra
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View article: Review of: "The Sagnac Effect and General Relativity Foundations"
Review of: "The Sagnac Effect and General Relativity Foundations" Open
View article: Ordinary Stars as Potential TeV Cosmic-Ray Accelerators
Ordinary Stars as Potential TeV Cosmic-Ray Accelerators Open
Recent observations of cosmic rays increasingly point to the existence of nearby sources - so-called "local tevatrons", capable of accelerating particles to TeV energies. In this study, we examine the potential of a typical main-sequence s…
View article: Review of: "Why Is Gravitational Mass Equal to Inertial Mass?"
Review of: "Why Is Gravitational Mass Equal to Inertial Mass?" Open
View article: Review of: "The One-Way Light Speed Is Measurable: Nonequivalence of the Lorentz Transformations and the Transformations Preserving Simultaneity and Spacetime Continuity"
Review of: "The One-Way Light Speed Is Measurable: Nonequivalence of the Lorentz Transformations and the Transformations Preserving Simultaneity and Spacetime Continuity" Open
View article: Spherical Accretion in the Schwarzschild Spacetime in the Newtonian Analogous Construct
Spherical Accretion in the Schwarzschild Spacetime in the Newtonian Analogous Construct Open
The velocity-dependent Newtonian analogous potentials (NAPs) corresponding to general relativistic (GR) spacetimes accurately capture most of the relativistic features, including all classical tests of GR, effectively representing spacetim…
View article: Redefining Mass Media from The Lens of Quantum Theories- An Introduction of Concepts and Theories
Redefining Mass Media from The Lens of Quantum Theories- An Introduction of Concepts and Theories Open
View article: Review of: "Electromagnetism Might Be the Source of Most of the Dark Energy"
Review of: "Electromagnetism Might Be the Source of Most of the Dark Energy" Open
Potential competing interests: No potential competing interests to declare.The author attempted to elucidate the concept of dark energy from electromagnetism.This is a new thought, but this proposition seems problematic.It is widely recogn…
View article: Probing Dark Matter Models Through Gravitational Time Delay
Probing Dark Matter Models Through Gravitational Time Delay Open
View article: Synchronization gauge field, standing waves and one-way-speed of light
Synchronization gauge field, standing waves and one-way-speed of light Open
The absolute nature of many fundamental predictions of the theory of special relativity, including the relativity of simultaneity, has been questioned in the literature owing to the choice of distant clock synchronization process in the th…
View article: Observation of variation in gamma-ray flux during the total solar eclipse at Siliguri (India) after developing a RooFit-based model
Observation of variation in gamma-ray flux during the total solar eclipse at Siliguri (India) after developing a RooFit-based model Open
The variability in γ-ray flux observed during total solar eclipses holds significant scientific interest. For our study, we employed two large-volume sodium iodide detectors to measure the γ-ray flux before, during, and after the "eclipse …
View article: Review of: "On the existence of precession of planets' orbits in Newtonian gravity"
Review of: "On the existence of precession of planets' orbits in Newtonian gravity" Open
Potential competing interests: No potential competing interests to declare.The topic is an important one.The findings are also interesting.However,
View article: Test of conformal theory of gravity as an alternative paradigm to dark matter hypothesis from gravitational lensing studies
Test of conformal theory of gravity as an alternative paradigm to dark matter hypothesis from gravitational lensing studies Open
Weyl's conformal gravity theory, which is considered as a compelling alternative to general relativity theory, has been claimed to describe the observed flat rotation curve feature of spiral galaxies without the need of invoking dark matte…
View article: On the Possibility of Observing Negative Shapiro-like Delay Using Michelson–Morley-Type Experiments
On the Possibility of Observing Negative Shapiro-like Delay Using Michelson–Morley-Type Experiments Open
The possibility of observing negative Shapiro-like gravitational time delay (or time advancement) due to the Earth’s gravity employing interferometric experiments on the Earth’s surface is discussed. It is suggested that such a measurement…
View article: Sun as a cosmic ray TeVatron
Sun as a cosmic ray TeVatron Open
Very recently, HAWC observatory discovered the high-energy gamma ray emission from the solar disk during the quiescent stage of the Sun, extending the Fermi-LAT detection of intense, hard emission between 0.1 - 200 GeV to TeV energies. The…
View article: Erratum: A quest for the origin of the Sagnac effect
Erratum: A quest for the origin of the Sagnac effect Open
View article: A quest for the origin of the Sagnac effect
A quest for the origin of the Sagnac effect Open
In the literature, there is no consensus on the origin of the relativistic Sagnac effect, particularly from the standpoint of the rotating observer. The experiments of Wang et al. (Phys Lett A 312(1–2):7, 2003; Phys Rev Lett 93(14):143901,…
View article: A pure hadronic model description of the observed neutrino emission from the tidal disruption event AT2019dsg
A pure hadronic model description of the observed neutrino emission from the tidal disruption event AT2019dsg Open
View article: Synchronization gauge field, standing waves and one-way-speed of light
Synchronization gauge field, standing waves and one-way-speed of light Open
The absolute nature of many fundamental predictions of the theory of special relativity, including the relativity of simultaneity, has been questioned in the literature owing to the choice of distant clock synchronization process in the th…
View article: AVS synchronization gauge field and standing waves
AVS synchronization gauge field and standing waves Open
We discuss the consequences of Anderson-Vetharaniam-Stedman (AVS) synchronization gauge on the standing wave formation. We found that although the position of the node (s) is gauge invariant and remain the same as in the standard case of t…
View article: Gravitational lensing study of cold dark matter-led galactic halo
Gravitational lensing study of cold dark matter-led galactic halo Open
In this work, the spacetime geometry of the halo region in spiral galaxies is obtained considering the observed flat galactic rotation curve feature, invoking the Tully–Fisher relation and assuming the presence of cold dark matter in the g…
View article: A quest for the origin of the uneven spread of Covid-19 cases
A quest for the origin of the uneven spread of Covid-19 cases Open
For more than one and a half years now the world is highly impacted by the Covid-19 pandemic. The covid-19 cases are, however, not evenly distributed across the countries; a few countries, particularly high-income countries have been hit h…
View article: Interpreting correlated observations of cosmic rays and gamma-rays from Centaurus A with a proton blazar inspired model
Interpreting correlated observations of cosmic rays and gamma-rays from Centaurus A with a proton blazar inspired model Open
The nearest active radio galaxy Centaurus (Cen) A is a gamma-ray emitter in GeV–TeV energy scale. The high energy stereoscopic system (HESS) and non-simultaneous Fermi–Large Area Telescope observation indicate an unusual spectral hardening…
View article: Impact of population density on Covid-19 infected and mortality rate in India
Impact of population density on Covid-19 infected and mortality rate in India Open
View article: Impact of population density on the Covid-19 infected and mortality rates in India
Impact of population density on the Covid-19 infected and mortality rates in India Open
The Covid-19 is a highly contagious disease which becomes a serious global health concern. The residents living in areas with high population density, such as big or metropolitan cities have a higher probability to come into close contact …
View article: A proposed strategy to reduce SARS-COV-2 infection possibility
A proposed strategy to reduce SARS-COV-2 infection possibility Open
The coronavirus disease 19 (COVID-19) is a highly infectious viral disease. Considering the rapid spread of the disease worldwide and lack of effective pharmaceutical drug to treat it, there is an urgent need to reduce infectivity of the v…
View article: Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars
Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars Open
Recent detection of the neutrino events IceCube-170922A, 13 muon-neutrino events observed in 2014-2015 and IceCube-141209A by IceCube observatory from the Blazars, namely TXS 0506+056, PKS 0502+049/TXS 0506+056 and GB6 J1040+0617 respectiv…
View article: Describing correlated observations of neutrinos and gamma-ray flares from the blazar TXS <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>0506</mml:mn><mml:mo>+</mml:mo><mml:mn>056</mml:mn></mml:mrow></mml:math> with a proton blazar model
Describing correlated observations of neutrinos and gamma-ray flares from the blazar TXS with a proton blazar model Open
Recent detection of the neutrino event, IceCube-170922A by IceCube\nobservatory from the Blazar TXS 0506+056 in the state of enhanced gamma ray\nemission indicates for acceleration of cosmic rays in the blazar jet. The\nnon-detection of th…
View article: Space-time geometry of spiral galaxy halo
Space-time geometry of spiral galaxy halo Open
Space-time geometry of halo region in spiral galaxies is derived using the observed flat galactic rotation curve feature and considering the presence of cold dark matter in the galaxy. Gravitational deflection angle due to the derived spac…
View article: Relative time delay in a spinning black hole as a diagnostic for no-hair theorem
Relative time delay in a spinning black hole as a diagnostic for no-hair theorem Open
View article: Probing maximum energy of cosmic rays in SNR through gamma rays and neutrinos from the molecular clouds around SNR W28
Probing maximum energy of cosmic rays in SNR through gamma rays and neutrinos from the molecular clouds around SNR W28 Open