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pro vyhledávání: '"Choudhury, Shibendu Gupta"'
Intrinsic spin of fermions can generate torsion in spacetime. This torsion is a non-propagating field that can be integrated out, leaving an effective non-universal four-fermion interaction. This geometrical interaction affects fermions inside a matt
Externí odkaz:
http://arxiv.org/abs/2401.13746
Publikováno v:
JCAP 01(2024) 007
We incorporate some corrections inspired by loop quantum gravity into the concept of gravitational collapse and propose a complete model of the dynamic process. The model carries the essence of a mass-independent upper bound on the curvature scalars
Externí odkaz:
http://arxiv.org/abs/2311.02585
Autor:
Choudhury, Shibendu Gupta
The works reported in this thesis primarily address the application of the Raychaudhuri equation in two intriguing problems in gravitational physics. These problems still lack universally accepted explanations. The first problem is related to the exi
Externí odkaz:
http://arxiv.org/abs/2301.08055
Autor:
Choudhury, Shibendu Gupta
Publikováno v:
Eur. Phys. J. Plus 137, 971 (2022)
Magnetic fields have been found to have an inherent capability of acting against gravity. An important question posed in the literature is whether presence of a magnetic field can alter the dynamics of a gravitational collapse and prevent the final f
Externí odkaz:
http://arxiv.org/abs/2203.14877
Publikováno v:
Eur. Phys. J. C 81, 906 (2021)
A recent attempt to arrive at a quantum version of Raychaudhuri's equation is looked at critically. It is shown that the method, and even the idea, has some inherent problems. The issues are pointed out here. We have also shown that it is possible to
Externí odkaz:
http://arxiv.org/abs/2103.13203
Publikováno v:
International Journal of Geometric Methods in Modern Physics, Vol. 18, No. 08, 2150115 (2021)
Implications of the Raychaudhuri equation in focusing of geodesic congruences are studied in the framework of scalar--tensor theory of gravity. Specifically, we investigate the Brans--Dicke theory and Bekenstein's scalar field theory. In both of thes
Externí odkaz:
http://arxiv.org/abs/2103.08869
Publikováno v:
Eur. Phys. J. C (2019) 79: 1027
The role of the Raychaudhuri equation in studying gravitational collapse is discussed. A self-similar distribution of a scalar field along with an imperfect fluid in a conformally flat spacetime is considered for the purpose. The general focusing con
Externí odkaz:
http://arxiv.org/abs/1912.05824
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 4, June 2019, Page 5693
A new strategy for the reconstruction of $f(R)$ gravity models have been attempted using Raychaudhuri equation. Two examples, one for an eternally accelerating universe and the other for one that mimics a ${\Lambda}$CDM expansion history have been wo
Externí odkaz:
http://arxiv.org/abs/1903.04775
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