A5101468837- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Physics of Superconductivity and Magnetism
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Earthquake Detection and Analysis
- Stellar, planetary, and galactic studies
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Solar and Space Plasma Dynamics
- Statistical Mechanics and Entropy
- Astrophysics and Star Formation Studies
- GNSS positioning and interference
- Superconductivity in MgB2 and Alloys
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Superconducting Materials and Applications
- earthquake and tectonic studies
- Complex Systems and Time Series Analysis
- Rare-earth and actinide compounds
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Stochastic processes and financial applications
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
University of Kashmir
2015-2024
University of Jammu
2007-2023
Islamic University of Science and Technology
2023
Indian Institute of Technology Roorkee
2020-2022
International Institute for Population Sciences
2020
Inter-University Centre for Astronomy and Astrophysics
2006-2018
Abstract As a joint research collaboration between the National Atmospheric Research Laboratory (NARL), and University of Kashmir (KU), NARL installed an all-sky airglow CCD imager (with centre wavelengths 630 nm, 557.7 nm [2 band widths] 840 [150 wide with blocking notch at 866 to avoid contamination molecular oxygen emissions]) in campus Srinagar (75°E, 34°N, geographic), Jammu Kashmir, India (western Himalayan region). To understand upper atmospheric dynamics ionospheric electrodynamics...
We calculate the irreducible triplet contribution to galaxy clustering in cosmological many-body problem. These triplets generally represent short-lived configurations which three close objects interact with pairwise gravitational forces. From resulting grand canonical partition function, we obtain higher order analytical expressions for thermodynamic quantities such as specific heats, isothermal compressibility, and thermal expansion system. Compared previous analyses, included reducible...
Abstract We report the influence of atmospheric gravity waves on medium scale traveling ionospheric disturbances (MSTIDs) that are observed during month September 2020, using an airglow imager over Srinagar, Kashmir. Several cases nighttime MSTIDs at ∼250 km altitude presented which propagate either in northwestward, northward or northeastward direction. Either phase fronts not aligned NW‐SE direction, propagating southwest these believed to be non‐electrified generally associated with...
The remarkable progress in cosmic microwave background (CMB) studies over past decade has led to the era of precision cosmology striking agreement with ΛCDM model. However, lack power CMB temperature anisotropies at large angular scales (low-ℓ), as been confirmed by recent Planck data also (up 0ℓ=4), although statistically not very strong (less than 3σ), is still an open problem. One can avoid seek explanation for this problem attributing variance or look explanations i.e., different...
We evaluate a distribution function for the system of galaxies clustering gravitationally in an expanding universe on basis statistical mechanics. extend our previous work to incorporate effect any ratio gravitational potential kinetic energies. determine cosmological many-body partition inclusive higher order terms and calculate all thermodynamic quantities from it. find that new results are consistent with ones, particularly large |$\bar{N}$| (average number galaxies) limit. also...
We extend the statistical mechanical theory of cosmological many-body problem to a system consisting two kinds galaxies with different masses. The general partition function for such two-component system, in grand canonical ensemble, is developed. From this various thermodynamical quantities and distribution functions are evaluated. A quantity b m , called clustering parameter which inherently takes into account ratio number particles (galaxies) each kind their masses, emerges directly from...
We report the superconducting state properties of YBa2Cu3O7 (YBCO) on introduction BaZrO3 (BZO) as a secondary phase. YBCO+xBZO (x= 0, 2, 4, 6, and 10 wt%) composite samples were prepared by solid reaction method characterized for structural, morphological properties. X-ray diffraction confirms increased crystallinity images scanning electron microscopy measurement show an increase in both grain size connectivity addition BZO YBCO. These effects are well pronounced applied magnetic field....
Temperature-dependent magnetic and a.c. susceptibility measurements were done on single phase polycrystalline LaMn1-yCoyO3 (y = 0.1, 0.4) samples. The field cooled zero performed indicate the presence of spin glass state which is established using measurements. data analyzed Arrhenius Vogel–Fulcher (VF) law reveal canonical glass.
We derive the cosmic energy equation for extended mass structures (i.e., galaxies with halos) which cluster gravitationally in expanding universe. From this equation, we study quasi-static evolution nonpoint system of galaxies. Using examine growth correlation potential masses. also expression virial and try to account dark matter present halos
We estimate the "non-gravitational" entropy-injection profiles, $\Delta K$, and resultant energy feedback E$, of intracluster medium for 17 clusters using their Planck SZ ROSAT X-Ray observations, spanning a large radial range from $0.2r_{500}$ up to $r_{200}$. The profiles are estimated by comparing observed entropy, at fixed gas mass shells, with theoretical entropy predicted non-radiative hydrodynamic simulations. include non-thermal pressure clumping in our analysis. inclusion results...
Non-gravitational feedback affects the nature of intra-cluster medium (ICM). X-ray cooling ICM and in situ energy from AGN's SNe as well {\it preheating} gas at epochs preceding formation clusters are proposed mechanisms for such feedback. While AGN feedbacks dominant cluster cores, signatures a preheated expected to be present even large radii. To estimate degree preheating, with minimum confusion feedback/cooling, we study excess entropy non-gravitational profiles upto $r_{200}$ sample 17...
We review the role of phonons in mechanism both conventional and high temperature superconductivity. find that while on one hand most superconductors fall within framework BCS phonon-mediated pairing, other complexity structural properties High allows determination only partial (oxygen) isotope effect, with values ranging from negligibly small to even higher than prediction. In either case, study shift is important its own right. arrive at conclusion are central explaining superconductivity,...