Journal
PHYSICAL REVIEW D
Volume 95, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.064008
Keywords
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Funding
- Department of Energy [DE-SC0009946]
- Royal Society Wolfson Merit Award
- Kavli Institute for Cosmological Physics at the University of Chicago [NSF PHY-0114422, NSF PHY-0551142]
- MINECO [SEV-2014-0398]
- PROMETEO [II/2014/050]
- Spanish of the MINECO [FPA2014-57816-P]
- European Union's Horizon 2020 research and innovation program [690575, 674896]
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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.4
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