Medium effects and thermal instability in φ36 theory

The authors calculate the effective mass and damping rate in φ63 theory at finite temperature by evaluating the real and imaginary parts of the one-loop self energies at the hard thermal loop (HTL) approximation. The authors show that there is thermal instability above a critical temperature Tc. The effective mass and damping rate are proportional to √gT and gT respectively. The authors compare the results with those in hot QCD