The propagation of pulsed wave fields in a homogeneous medium or in a homogeneous line with known dispersion law and damping can be regarded from the ray, wave, and energy points of view. The review describes the most significant theoretical results on one-dimensional pulse propagation, using all three approaches. Greatest attention is paid to the principal part of a high-frequency pulse, the part governed by frequencies closest to the pulse carrier frequency. Paradoxes pertaining to superluminal and negative ``group velocities'' are resolved, and questions connected with amplification or attenuation of waves in wave beams and active media are discussed.

PT Journal Article
TI Propagation of pulses
AU Vainshtein L A
FAU Vainshtein LA
DP 10 Feb, 1976
TA Phys. Usp.
VI 19
IP 2
PG 189-205
RX 10.1070/PU1976v019n02ABEH005138
URL https://ufn.ru/en/articles/1976/2/h/
SO Phys. Usp. 1976 Feb 10;19(2):189-205