Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.241303
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Funding
- US DOE
- NASA ATP [NNX11AI95G]
- NSF CAREER [PHY-1145525]
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Economic Development and Innovation
- John Templeton Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1145525] Funding Source: National Science Foundation
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We show that the Dirac-Born-Infeld conformal galileons, derived from the world-volume theory of a 3-brane moving in an anti-de Sitter bulk, admit a background, stable under quantum corrections, which violates the null energy condition. The perturbations around this background are stable and propagate subluminally. Unlike other known examples of null energy condition violation, such as ghost condensation and conformal galileons, this theory also admits a stable, Poincare-invariant vacuum. The 2 -> 2 amplitude satisfies standard analyticity conditions. The full S matrix is likely not analytic, however, since perturbations around deformations of the Poincare invariant vacuum propagate superluminally.
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