  We study a discrete two-dimensional nonlinear system that allows for discrete
breather solutions. We perform a spectral analysis of the lattice dynamics at
thermal equilibrium and use a cooling technique to measure the amount of
breathers at thermal equilibrium. Our results confirm the existence of an
energy threshold for discrete breathers. The cooling method provides with a
novel computational technique of measuring and analyzing discrete breather
distribution properties in thermal equilibrium.

Statistical Mechanics