PT Journal
AU de Rham, C
   Motohashi, H
TI Caustics for spherical waves
SO Physical Review D
JI Phys. Rev. D
PY 2017
BP 064008
EP 13pp
VL 95
IS 6
DI 10.1103/PhysRevD.95.064008
LA English
AB We study the development of caustics in shift-symmetric scalar field theories by focusing on simple waves with an SO(p)-symmetry in an arbitrary number of space dimensions. We show that the pure Galileon, the DBI-Galileon, and the extreme-relativistic Galileon naturally emerge as the unique set of caustic-free theories, highlighting a link between the caustic-free condition for simple SO(p)-waves and the existence of either a global Galilean symmetry or a global (extreme-) relativistic Galilean symmetry.
ER