TY  - JOUR
AU  - de Rham, C.
AU  - Motohashi, H.
PY  - 2017
DA  - 2017//
TI  - Caustics for spherical waves
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 064008
EP  - 13pp
VL  - 95
IS  - 6
PB  - Amer Physical Soc
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.
SN  - 2470-0010
UR  - http://arxiv.org/abs/1611.05038
UR  - https://doi.org/10.1103/PhysRevD.95.064008
DO  - 10.1103/PhysRevD.95.064008
LA  - English
N1  - WOS:000396031700006
ID  - deRham+Motohashi2017
ER  -