IUCAA Preprints

Permanent URI for this communityhttp://localhost:4000/handle/11007/149

Browse

Filters

2000 - 20012

Settings

Subject: search.filters.subject.Magnetized Medium

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Effective neutrino photon interaction in a magnetized medium
    (2001-05-01) Bhattacharya, Kaushik; Ganguly, Avijit K.; Konar, Sushan
    Neutrino-photon processes, forbidden in vacuum, can take place in presence of a thermal medium or an external electro-magnetic field, mediated by the corresponding charged leptons (real or virtual). The effect of a medium or an electromagnetic field is two-fold - to induce an effective ν−γ vertex and to modify the dispersion relations of all the particles involved to render the processes kinematically viable. It has already been noted that in presence of a thermal medium such an electromagnetic interaction translates into the neutrino acquiring a small effective charge. In this work, we extend this concept to the case of a thermal medium in presence of an external magnetic field and calculate the effective charge of a neutrino in the limit of a weak magnetic field. We find that the effective charge is direction dependent which is a direct effect of magnetic field breaking the isotropy of the space.
  • No Thumbnail Available
    Item
    Absorption of Electro-magnetic Waves in a Magnetized Medium
    (2000-07-04) Ganguly, Avijit K.; Konar, Sushan
    In continuation to our earlier work, in which the structure of the vacuum polarisation tensor in a medium was analysed in presence of a background electro-magnetic field, we discuss the absorptive part of the vacuum polarization tensor. Using the real time formalism of finite temperature field theory we calculate the absorptive part of 1-loop vacuum polarisation tensor in the weak field limit (eB < m2 ). Estimates of the absorption probability are also made for different physical conditions of the background medium.