Speaker
Описание
Bulk viscosity near QCD phase transition and spontaneous
symmetry breaking effect
Waseem Bashir 1 , Hamid Nanda 2 , Rameez Ahmad Parra
2,3
3
1
Department of Physics, GDC, Budgam, Kashmir -191111, India.
Department of Physics, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi-110025,
India.
Abstract
We evaluate the effect of spontaneous symmetry breaking on the transport properties of
strongly interacting fermionic matter near QCD phase transition. We develop a field theoreti-
cal model using dynamic quasi-particle description for fermions which are allowed to interact with
Nambu-Goldstone modes via Yukawa type coupling. We solve this model at Wilson-Fisher fixed
point and evaluate perturbative expression for bulk and shear viscosity of this medium. To analyze
the behaviour of these transport coefficients near QCD phase transition region we use scaling anal-
ysis. It is found that Nambu-Goldstone modes can result in singular behaviour of bulk viscosity
to entropy ratio ζ/s in the Z(2) universality class.
