Avijit K. Ganguly
Saha Institute of Nuclear Physics
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Featured researches published by Avijit K. Ganguly.
Physical Review D | 1999
Avijit K. Ganguly; Sushan Konar; Palash B. Pal
We analyze the structure of the vacuum polarization tensor in the presence of a background electromagnetic field in a medium. We use various discrete symmetries and crossing symmetry to constrain the form factors obtained for the most general case. From these symmetry arguments, we show why the vacuum polarization tensor has to be even in the background field when there is no background medium. Taking then the background field to be purely magnetic, we evaluate the vacuum polarization to linear order in it. The result shows the phenomenon of Faraday rotation, i.e., the rotation of the plane of polarization of a plane polarized light passing through this background. We find that the usual expression for Faraday rotation, which is derived for a non-degenerate plasma in the non-relativistic approximation, undergoes substantial modification if the background is degenerate and/or relativistic. We give explicit expressions for Faraday rotation in completely degenerate and ultra-relativistic media.
Physical Review D | 2003
Avijit K. Ganguly; R. Parthasarathy
Optical activity, like Faraday effect, is a rotation of the plane of polarization of propagating light in a medium and can be attributed to different sources with distinct signatures. In this note we discuss the effect of optical activity {\it{in vacuum}} due to Kaluza-Klein scalar field
Physical Review D | 2001
Avijit K. Ganguly; Sushan Konar
\phi
Physical Review D | 2014
Avijit K. Ganguly; Manoj K. Jaiswal
, in the presence of an external electro-magnetic field. The astrophysical implication of this effect is indicated. We also point out the possibility of observing the same in laboratory conditions.
Physical Review D | 2009
Avijit K. Ganguly; Pankaj Jain; Subhayan Mandal
In continuation to our earlier work, in which the structure of the polarization tensor in a medium was analyzed in the presence of a background electromagnetic field, we discuss the absorptive part of the polarization tensor. Using the real time formalism of finite temperature field theory we calculate the absorptive part of the 1-loop polarization tensor in the weak field limit
Physical Review D | 2001
Kaushik Bhattacharya; Avijit K. Ganguly; Sushan Konar
(eBl{m}^{2}).
arXiv: High Energy Physics - Theory | 1998
Avijit K. Ganguly
Estimates of the absorption probability are also made for different physical conditions of the background medium.
arXiv: High Energy Physics - Phenomenology | 2002
Kaushik Bhattacharya; Avijit K. Ganguly
Dimension-five photon
Archive | 2016
Manoj K. Jaiswal; Avijit K. Ganguly
(\gamma )
arXiv: High Energy Physics - Phenomenology | 2013
Avijit K. Ganguly; Shikha Awasthi; Manoj K. Jaiswal
scalar