title: Dirac-Born-Infeld genesis: an improved violation of the null energy condition.
abstract: 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, Poincaré-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 Poincaré invariant vacuum propagate superluminally.
authors.affiliation: Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario, Canada N2L 2Y5.
authors.forename: Kurt
authors.initials: K
authors.lastname: Hinterbichler
authors.affiliation: Center for Particle Cosmology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Austin
authors.initials: A
authors.lastname: Joyce
authors.affiliation: Center for Particle Cosmology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Justin
authors.initials: J
authors.lastname: Khoury
authors.affiliation: Center for Particle Cosmology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Godfrey E J
authors.initials: GE
authors.lastname: Miller