A5090192242- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radioactivity and Radon Measurements
- Galaxies: Formation, Evolution, Phenomena
- Radioactive Decay and Measurement Techniques
- Radiative Heat Transfer Studies
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
- Advanced Fiber Optic Sensors
- Particle Detector Development and Performance
University of Alabama
2023
S.N. Bose National Centre for Basic Sciences
2005-2009
North Bengal University
1984-1991
The braneworld description of our universe entails a large extra dimension and fundamental scale gravity that might be lower by several orders magnitude compared to the Planck scale. An interesting consequence scenario is in nature spherically symmetric vacuum solutions brane gravitational field equations which could represent black holes with properties quite distinct ordinary 4-dimensions. We discuss certain key features some hole geometries. Such are likely have diverse cosmological...
Braneworld black holes existing today may be of primordial origin, or even produced in high energy particle collisions the laboratory and cosmic ray showers as well. These obey a modified mass-radius relationship compared to standard Schwarzschild holes. Using variational principle we calculate bending angle light near horizon braneworld hole weak field limit. We next derive expressions several lensing quantities like Einstein radius magnification for point source. are contain scale extra dimensions.
Cosmic ray air shower structure measurements and measurement of density energy muons a wide range simultaneously in individual showers by two magnet spectrographs (MDM approximately 500 GeV c-1) are presented. The measured muon densities have been used to compare with some the previous on nearly same size. also applied for distinguishing between various interaction models light heavier primaries. In size 104-106 particles present do not provide evidence iron primaries different seem be...
Low energy, low rate experiments, such as searches for neutrinoless double beta decay and dark matter, require unprecedentedly levels of background in order to deliver their full science potential. $^{210}$Po driven, neutron induced background, caused by nuclear $(α, n)$-reactions on low-Z materials, direct contributions the $α$-radiation desorption $^{210}$Pb progeny $^{210}$Bi from surfaces into detector medium are particular concern. These backgrounds depend details components' exposure...
Low energy, low rate experiments, such as searches for neutrinoless double beta decay and dark matter, require unprecedentedly levels of background in order to deliver their full science potential. $^{210}$Po driven, neutron induced background, caused by nuclear $(\alpha, n)$-reactions on low-Z materials, direct contributions the $\alpha$-radiation desorption $^{210}$Pb progeny $^{210}$Bi from surfaces into detector medium are particular concern. These backgrounds depend details components'...
The energy spectra and the lateral distribution of muons in cosmic-ray air showers, size range 10 4 –10 6 particles as measured by two magnetic spectrographs each full detection efficiency for 2.5–500 GeV, are presented along with derived muon vs. shower results. Comparisons similar recent experimental data calculations given to infer primary composition.