Boundary-layer theory for the extremely underdamped Brownian motion in a metastable potential
by H. Risken, K. Vogel, H. D. Vollmer
A theory for the boundary layer near the critical trajectory for the extremely underdamped Brownian motion in a metastable potential is presented. The probability distribution function in phase space near this critical trajectory, the average escape energy, and the correction terms for the zero-friction-limit escape rate are calculated.