Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Ritabrata Biswas"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-16 (2021)
Abstract Viscous accretion flow around a rotating supermassive black hole sitting in a quintessence tub is studied in this article. To introduce such a dark energy contaminated black hole’s gravitational force, a new pseudo-Newtonian potential is u
Externí odkaz:
https://doaj.org/article/fc404c2aef9840dea873de1f59b69626
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 4, Pp 1-15 (2021)
Abstract In this present article, we study different accretion properties regarding viscous accretion of dark energy. Modified Chaplygin gas is chosen as the dark energy candidate. Viscosity is encountered with the help of Shakura–Sunyaev viscosity
Externí odkaz:
https://doaj.org/article/fd1d413e232c47a2b7fcf44170beded7
Autor:
Parthajit Roy, Ritabrata Biswas
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-11 (2020)
Abstract In the recent past, progress in accretion studies onto general relativistically gravitating central objects viz. a Schwarzschild singularity reveals that the accretion flow should be transonic. Regarding such cases, radial inward speed gradi
Externí odkaz:
https://doaj.org/article/b8d58aae8f55494e8cb68073c3a22959
Autor:
Ritabrata Biswas, Sandip Dutta
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-12 (2019)
Abstract Recent studies of galactic cores tell us that supermassive black holes are hosted at each of these cores. We got some evidences even. Besides, dark energy is expected to be distributed all over in our universe. Dark matter halo, on the other
Externí odkaz:
https://doaj.org/article/1477cab0fe7d44b1b731447d9ee07505
Autor:
Sandip Dutta, Ritabrata Biswas
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 6, Pp 1-9 (2019)
Abstract The universal lower bound of the ratio of shear viscosity to entropy density is suggested by the string theory and gauge duality for any matter. We examined the ratio of shear viscosity to entropy density for viscous accretion flow towards a
Externí odkaz:
https://doaj.org/article/62e342dfa9ce4d9eaececa4c777fb4a4
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 5, Pp 1-24 (2019)
Abstract Pseudo-Newtonian potential has always been a useful tool to discuss the motion of a particle in space-time to avoid the tedious and nearly impossible nonlinear computations coming from the field equations of general relativity. Mukhopadhyay,
Externí odkaz:
https://doaj.org/article/2bd54f016599402a8a9d7328dcb11457
Autor:
Sandip Dutta, Ritabrata Biswas
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 10, Pp 1-11 (2017)
Abstract This paper deals with the viscous accretion flow of a modified Chaplygin gas towards a black hole as the central gravitating object. A modified Chaplygin gas is a particular type of dark energy model which mimics of radiation era to phantom
Externí odkaz:
https://doaj.org/article/687c6f0769994d8fbddfa48367b02b28
Autor:
Mayukh Bandyopadhyay, Ritabrata Biswas
Publikováno v:
International Journal of Modern Physics D. 32
Recent research works have shown the existence of super-massive neutron stars (NSs) with mass about [Formula: see text] or even more. The query about those super-massive NSs inspires the researchers to analyze their features and structures immensely.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2501dbd482f149141a5af8c899be8575
https://doi.org/10.1142/s0218271823500062
https://doi.org/10.1142/s0218271823500062
Autor:
Sandip Dutta1 (AUTHOR) Duttasandip.mathematics@gmail.com, Ritabrata Biswas1 (AUTHOR) biswas.ritabrata@gmail.com
Publikováno v:
Journal of Experimental & Theoretical Physics. Jun2020, Vol. 130 Issue 6, p842-858. 17p.
Publikováno v:
Modern Physics Letters A. 37
A four-dimensional solution of the classical equation of motion in the low-energy effective field theory for heterotic string theory is chosen. Popularly, this is known as Kerr–Sen black hole. Thermodynamic picture for this particular black hole is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e431be70540f19ae869024b53809e1c
https://doi.org/10.1142/s0217732322501310
https://doi.org/10.1142/s0217732322501310