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.

RT Journal
T1 Propagation of pulses
A1 Vainshtein,L.A.
PB Physics-Uspekhi
PY 1976
FD 10 Feb, 1976
JF Physics-Uspekhi
JO Phys. Usp.
VO 19
IS 2
SP 189-205
DO 10.1070/PU1976v019n02ABEH005138
LK https://ufn.ru/en/articles/1976/2/h/