Rajendra P. Gupta
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View article: Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn
Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn Open
The formation and evolution of galaxies and other astrophysical objects have become of great interest, especially since the launch of the James Webb Space Telescope in 2021. The mass, size, and density of objects in the early universe appe…
View article: Testing CCC+TL Cosmology with Galaxy Rotation Curves
Testing CCC+TL Cosmology with Galaxy Rotation Curves Open
This paper aims to explore whether astrophysical observations, primarily galaxy rotation curves, result from covarying coupling constants (CCC) rather than from dark matter. We have shown in earlier papers that cosmological observations, s…
View article: Economic Evaluations in Psychiatry
Economic Evaluations in Psychiatry Open
View article: Erratum: “Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features” (2024, ApJ, <b>964</b>, 55)
Erratum: “Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features” (2024, ApJ, <b>964</b>, 55) Open
View article: Domestic Violence during Pregnancy and Its Interaction with Hormonal Changes and Abuse: A Review of Suicide Risk Factors
Domestic Violence during Pregnancy and Its Interaction with Hormonal Changes and Abuse: A Review of Suicide Risk Factors Open
Domestic violence—encompassing physical, emotional, and psychological abuse—significantly elevates suicide risk among pregnant women, a population already vulnerable due to profound physiological and psychological changes during pregnancy.…
View article: On Dark Matter and Dark Energy in CCC+TL Cosmology
On Dark Matter and Dark Energy in CCC+TL Cosmology Open
Relaxing the temporal constancy constraint on coupling constants in an expanding universe results in Friedmann equations containing terms that may be interpreted as dark energy and dark matter. When tired light (TL) was considered to compl…
View article: Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features
Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features Open
The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measur…
View article: <i>JWST</i> early Universe observations and ΛCDM cosmology
<i>JWST</i> early Universe observations and ΛCDM cosmology Open
Deep space observations of the JWST have revealed that the structure and masses of very early Universe galaxies at high redshifts ($z\sim15$), existing at $\sim$0.3 Gyr after the Big Bang, may be as evolved as the galaxies in existence for…
View article: Dynamical Analysis of the Covarying Coupling Constants in Scalar–Tensor Gravity
Dynamical Analysis of the Covarying Coupling Constants in Scalar–Tensor Gravity Open
A scalar–tensor theory of gravity was considered, wherein the gravitational coupling G and the speed of light c were admitted as space–time functions and combined to form the definition of the scalar field ϕ. The varying c participates in …
View article: Constraining Co-Varying Coupling Constants from Globular Cluster Age
Constraining Co-Varying Coupling Constants from Globular Cluster Age Open
Equations governing the evolution of a star involve multiple coupling constants. Thus, the time it spends as a main-sequence star can be expected to depend on whether or not such constants vary over the time scale of stellar evolution. Whe…
View article: Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs
Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs Open
Dirac, in 1937, proposed the potential variation of coupling constants derived from his large numbers hypothesis. Efforts have continued since then to constrain their variation by various methods, including astrophysical and cosmological o…
View article: Expression Pattern of SLIT 2 Genes Discriminates Malignant from Benign Canine Mammary Tumours
Expression Pattern of SLIT 2 Genes Discriminates Malignant from Benign Canine Mammary Tumours Open
The study was conducted to investigate the expression of SLIT2 gene in representative tissue samples of mammary tumours of female dogs (n=10) with the age between 5.0 and 16.5 years brought to Veterinary Clinical Complex, LUVAS, Hisar. Exc…
View article: Varying coupling constants and their interdependence
Varying coupling constants and their interdependence Open
Since Dirac predicted in 1937 the possible variation of gravitational constant and other coupling constants from his large number hypothesis, efforts continue to determine such variation without success. Such efforts focus on the variation…
View article: Testing a varying-Λ model for dark energy within co-varying physical couplings framework
Testing a varying-Λ model for dark energy within co-varying physical couplings framework Open
The Co-varying Physical Couplings (CPC) framework is a modified gravity set up assuming Einstein Field Equations wherein the quantities {G, c, Λ} are promoted to space–time functions. Bianchi identity and the requirement of stress-energy t…
View article: Measuring inertial mass with Kibble balance
Measuring inertial mass with Kibble balance Open
A Kibble balance measures the $gravitational$ mass (weight) of a test mass with extreme precision by balancing the gravitational pull on the test mass against the electromagnetic lift force. The uncertainty in such mass measurement is curr…
View article: Constraining variability of coupling constants with bright and extreme quasars
Constraining variability of coupling constants with bright and extreme quasars Open
The ‘extreme Population A (xA) quasars’ approaching, sometimes exceeding the Eddington limit, are a type of quasars that could serve as standard candles to measure distances too large for supernovae type Ia (SNe Ia) to be observable. For u…
View article: Dynamical analysis of the covarying coupling constants in scalar-tensor gravity
Dynamical analysis of the covarying coupling constants in scalar-tensor gravity Open
A scalar-tensor theory of gravity is considered wherein the gravitational coupling $G$ and the speed of light $c$ are admitted as space-time functions and combine to form the definition of the scalar field $ϕ$. The varying $c$ participates…
View article: Effect of evolving physical constants on type Ia supernova luminosity
Effect of evolving physical constants on type Ia supernova luminosity Open
Type Ia supernovae, SNeIa, are used as standard candles in cosmology to determine the distances of the galaxies harbouring them. We show that the luminosity of an SNIa depends on its distance from us when physical constants (the speed of l…
View article: Varying Coupling Constants and Their Interdependence
Varying Coupling Constants and Their Interdependence Open
Since Dirac predicted in 1937 possible variation of gravitational constant and other coupling constants from his large number hypothesis, efforts continue to determine such variation without success. Such efforts focus on the variation of …
View article: P1 Global overview of incidence and prevalence of interstitial lung disease: a systematic literature review
P1 Global overview of incidence and prevalence of interstitial lung disease: a systematic literature review Open
Introduction Interstitial lung diseases (ILD) are a diverse group of pulmonary fibrotic and inflammatory conditions. The global burden of ILD is largely unknown, in part because of differences between countries in diagnosis and in coding p…
View article: Testing the Speed of Light Variation with Strong Gravitational Lensing of SNe 1a
Testing the Speed of Light Variation with Strong Gravitational Lensing of SNe 1a Open
The constancy of the speed of light c is the foundation of most physical theories and is found to be indeed constant from local measurements. Whether or not the same is true at cosmological timescale has been of interest for some time. The…
View article: Varying physical constants and the lithium problem
Varying physical constants and the lithium problem Open
View article: Constraint on G˙/G from Orbital Timing
Constraint on G˙/G from Orbital Timing Open
Constraints on the variation of the gravitational constant G have been obtained by many observers using different methods, the most reliable and stringent being those based on the orbital timing of bodies in the solar system and binary pul…
View article: Do varying physical constants provide solution to the lithium problem
Do varying physical constants provide solution to the lithium problem Open
We have used the recently published varying physical constants (VPC) approach to resolve the primordial lithium abundance problem. The value of the ratio of 7Li to hydrogen $7Li/H=1.400(+-0.023){\times}10^{-10}$ we have calculated using th…
View article: Cosmology with relativistically varying physical constants
Cosmology with relativistically varying physical constants Open
We have shown that the varying physical constant model is consistent with the recently published variational approach wherein Einstein equations are modified to include the variation of the speed of light c, gravitational constant G, and c…
View article: Cosmology with Relativistically Varying Physical Constants
Cosmology with Relativistically Varying Physical Constants Open
We have shown that our varying physical constant model is consistent with the recently published variational approach wherein Einstein equations are modified to include the variation of the speed of light c, gravitational constant G and co…
View article: Childhood maltreatment and its mental health consequences among Indian adolescents with a history of child work
Childhood maltreatment and its mental health consequences among Indian adolescents with a history of child work Open
Objectives: Although the prevalence and mental health consequences of childhood maltreatment among adolescents have been studied widely, there are few data addressing these issues in Asian lower middle–income countries. Here, we assessed t…
View article: Supplementary_Materials – Supplemental material for Childhood maltreatment and its mental health consequences among Indian adolescents with a history of child work
Supplementary_Materials – Supplemental material for Childhood maltreatment and its mental health consequences among Indian adolescents with a history of child work Open
Supplemental material, Supplementary_Materials for Childhood maltreatment and its mental health consequences among Indian adolescents with a history of child work by Rakesh Pandey, Shulka Gupta, Aakanksha Upadhyay, Rajendra Prasad Gupta, M…
View article: The Flatness Problem and the Variable Physical Constants
The Flatness Problem and the Variable Physical Constants Open
We have used the varying physical constant approach to resolve the flatness problem in cosmology. Friedmann equations are modified to include the variability of speed of light, gravitational constant, cosmological constant, and the curvatu…
View article: The Flatness Problem and the Varying Physical Constants
The Flatness Problem and the Varying Physical Constants Open
We have used the varying physical constant approach to resolve the flatness problem in cosmology. Friedmann equations are modified to include variability of speed of light, gravitational constant, cosmological constant and the curvature co…