Free Meson Seminars
The Nambu Jona-Lasinio model with density dependent U_A(1) anomaly
by Dr. Hiroaki Kohyama (Academia Sinica, Taiwan)
Thursday, January 28, 2010
from
to
(Asia/Kolkata)
at Colaba Campus ( AG-69 )
at Colaba Campus ( AG-69 )
Description |
Whether the phase transition from chiral broken phase to chiral restored state is of the first order is an interesting question. To study this, we use the Nambu Jona-Lasinio model which is believed to be a low energy effective theory of quantum chromodynamics (QCD). In this work, we consider the density dependent U_A(1) anomaly and study the critical surface in the quark mass and chemical potential space. We have found that the surface shrinks when a quark chemical potential increases, which is the opposite result from the study by using usual NJL model. The difference comes from the density dependence of the U_A(1) anomaly and our result is consistent to the recent lattice QCD study. Our result suggest the restoration of the U_A(1) anomaly at high density, which seems to be physically reasonable because a colour superconductivity state may dominate at intermediate baryon density where the U_A(1) anomaly should be negligible. |
Organised by | Saumen Datta |
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