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pro vyhledávání: '"Gupta, Patrick Das"'
Autor:
Gupta, Patrick Das
The space-time geometry in any inertial frame is described by the line-element $ds^2= \eta_{\mu \nu} dx^\mu dx^\nu$. Now, not only the Minkowski metric $\eta_{\mu \nu} $ is invariant under proper Lorentz transformations, the totally antisymmetric Lev
Externí odkaz:
http://arxiv.org/abs/2404.17798
Autor:
Saini, Nidhi, Gupta, Patrick Das
Fast radio bursts (FRBs) are radio transients of extragalactic origin lasting for about a few to several milli-seconds. We have analyzed both non-CHIME and CHIME FRB data. To circumvent the absence of measured fluence and flux density of FRBs belongi
Externí odkaz:
http://arxiv.org/abs/2310.11992
Autor:
Gupta, Patrick Das, Sirtaz, Mohd.
We describe charged BHs, Penrose process for energy extraction from Kerr BHs and Wald's proposal concerning a Kerr BH slowly becoming a Kerr-Newman BH in the presence of a uniform magnetic field. In the context of BHs bearing magnetic charge, we disc
Externí odkaz:
http://arxiv.org/abs/2306.14473
Publikováno v:
In Biophysical Chemistry August 2024 311
Autor:
Gupta, Patrick Das
Publikováno v:
Lectures on Quantum Mechanics: Fundamentals and Applications, eds. A. Pathak & Ajoy Ghatak, ISBN 9788130929958 (Viva Books Pvt. Ltd., 2020)
Beginning with the basic notions of quantum theory, impossibility of `trajectory' description for particles that ensues from uncertainty principle is discussed. Why the observed tracks in bubble/cloud chambers are not really the `trajectories' of hig
Externí odkaz:
http://arxiv.org/abs/2010.12010
Autor:
Gupta, Patrick Das
Publikováno v:
Resonance, Vol.25, No.10, pp.1319-1337 (2020)
Freeman J. Dyson, a brilliant theoretical physicist and a gifted mathematician, passed away on 28 February 2020 at the age of 96. A vignette of his outstanding contributions to physical sciences, ranging from the subject of quantum electrodynamics to
Externí odkaz:
http://arxiv.org/abs/2010.07767
Autor:
Gupta, Patrick Das, Rahman, Fazlu
Publikováno v:
The Physical Universe, eds. S. M. Wagh, S. D. Maharaj & G. Chon (2018, Published by Central India Research Institute, Nagpur, India)
First, we verify that the physical parameters estimated for the four directly detected gravitational wave (GW) events involving coalescence of binary black holes (BHs) indeed uphold the second law of BH thermodynamics, strengthening further the case
Externí odkaz:
http://arxiv.org/abs/1801.02559
Autor:
Gupta, Patrick Das, Saini, Nidhi
Publikováno v:
Journal of Astrophysics and Astronomy, Volume 39, Issue 1, February (2018)
Fast radio bursts (FRBs) last for $\sim $ few milli-seconds and, hence, are likely to arise from the gravitational collapse of supra-massive, spinning neutron stars after they lose the centrifugal support (Falcke \& Rezzolla 2014). In this paper, we
Externí odkaz:
http://arxiv.org/abs/1709.00185
Autor:
Gupta, Patrick Das
Publikováno v:
The Growth and Development of Astronomy and Astrophysics in India and the Asia-Pacific Region, TIFR 2018, eds. W. Orchiston, A. Sule & M. Vahia
A verse in book I of Rigveda mentions a cosmic tree with rope-like aerial roots held up in the sky. Such an imagery might have ensued from the appearance of a comet having `tree stem' like tail, with branched out portions resembling aerial roots. Int
Externí odkaz:
http://arxiv.org/abs/1704.00722
Autor:
Gupta, Patrick Das
The 2017 Nobel Prize in physics awarded to Rainer Weiss, Barry C. Barish and Kip S. Thorne has generated unprecedented interest in gravitational waves (GWs). These notes are based on my lectures on various occasions - in the University of Delhi as we
Externí odkaz:
http://arxiv.org/abs/1604.00951