  The trigonometric Ruijsenaars-Schneider model is diagonalized by means of the
Macdonald symmetric functions. We evaluate the dynamical density-density
correlation function and the one-particle retarded Green function as well as
their thermodynamic limit. Based on these results and finite-size scaling
analysis, we show that the low-energy behavior of the model is described by the
$C=1$ Gaussian conformal field theory under a new fractional selection rule for
the quantum numbers labeling the critical exponents.
