Free Meson Seminars
The fate of axial anomaly in high temperature QCD
by Dr. Sayantan Sharma (University of Bielefeld)
Thursday, January 9, 2014
from
to
(Asia/Kolkata)
at Colaba Campus ( A304 )
at Colaba Campus ( A304 )
Description |
The axial anomaly is believed to affect the order of phase transition related to chiral symmetry restoration in QCD with two light quark flavours. I discuss about our recent study on the effects of the axial anomaly(U_A(1)) for 2+1-flavour QCD at high temperature. We apply the overlap Dirac operator as a tool to probe the topological properties of gauge field configurations which have been generated within the Highly Improved Staggered Quark (HISQ) discretization scheme on different lattice sizes, commonly used for the study of QCD thermodynamics. The distribution of the low-lying eigenvalues of the overlap operator suggests that the U_A(1) is not restored effectively even at 1.5 times the pseudo critical temperature, corresponding to the restoration of chiral symmetry. I will discuss possible implications of our study for the phase diagram of QCD. Our study also suggest that the high temperature phase of QCD can be described as a dilute gas of instantons. |