%0 Journal Article
%T Caustics for spherical waves
%A de Rham, C.
%A Motohashi, H.
%J Physical Review D
%D 2017
%V 95
%N 6
%I Amer Physical Soc
%@ 2470-0010
%G English
%F deRham+Motohashi2017
%O WOS:000396031700006
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3032), last updated on Fri, 14 Apr 2017 23:12:59 +0000
%X 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.
%R 10.1103/PhysRevD.95.064008
%U http://arxiv.org/abs/1611.05038
%U https://doi.org/10.1103/PhysRevD.95.064008
%P 064008-13pp