Stability and superluminality of spherical DBI galileon solutions

Details Stability and superluminality of spherical DBI galileon solutions Stability and superluminality of spherical DBI galileon solutions

2010-08-26

arxiv.org/abs/1008.4580v2

Phys.Rev.D83:085015,2011

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 1 figure. Discussions added, version appearing in PRD

Scientific paper

10.1103/PhysRevD.83.085015

The DBI galileons are a generalization of the galileon terms, which extend the internal galilean symmetry to an internal relativistic symmetry, and can also be thought of as generalizations of DBI which yield second order field equations. We show that, when considered as local modifications to gravity, such as in the Solar system, there exists a region of parameter space in which spherically symmetric static solutions exist and are stable. However, these solutions always exhibit superluminality, casting doubt on the existence of a standard Lorentz invariant UV completion.

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