Speaker
Description
The response functions of a particular medium is a basic tool to understand the properties
of the medium. In the same spirit, Chromo-electric/magnetic response functions (such as
Dielectric permittivity , refractive index , etc.,) can be used to understand the medium
properties of hot QCD/QGP medium. We first obtain the gluon polarisation tensor in a hot
QCD medium which is described in terms of effective quasi-particle degrees of freedom with
anisotropy(momentum) within transport theory approach. The effects of the collisions
have been neglected since the estimations are done for very near equilibrium situations and
for smaller strength of the anisotropy. The response functions (chromoelectric permittivity
and chromomagnetic permeability) could be obtained by taking the static limit of the
polarization tensor. The hot QCD plasma possess a collective motion due to the fluctuation
or perturbation in the equilibrium state, which are termed as quasi-particle collective
excitations of the plasma.
These excitations have different collective modes known as
plasmons of quark-gluon plasma. These modes play an important role in the dynamical
evolution of a quark-gluon plasma. The investigation are mainly focussed around such
collective modes. Future extension of the work will also include an appropriate collision
term in the effective transport equation that has been set-up to determine the response
functions.
Reference:
Chromo-Electromagnetic response functions and collective modes of hot QCD medium},
M Yousuf Jamal, Vinod Chandra, Sukanya Mitra (in preparation).
Collective Modes of an Anisotropic Quark-Gluon Plasma,P. Romatschke and M.
Strickland, Phys.Rev.D (2004)70, 116006.
Plasmons in anisotropic quark-gluon plasma, Margaret E. Carrington, Katarzyna Deja and Stanislaw Mrowczy, Phys.Rev.C (2014) 90, 034913.
| Preferred Track | Collective Dynamics |
|---|---|
| Collaboration | Not applicable |
