The sound velocity in an equilibrium hadron gas

Abstract

We calculate the velocity of sound in an ideal gas of massive hadrons with non-vanishing baryon number. The gas is in thermal and chemical equilibrium. Also we show that the temperature dependence $T(\ddot{I}„)\cong T_0\cdot (\frac{\ddot{I}{„}_0}{\ddot{I}„}{)}^{c_s^2}$ is approximately valid, when the gas expands longitudinally according to the Bjorken law.

LaTeX, 6 figures (included), 6 pages, changes are made in figure captions 1-5