The phantom menaced: constraints on low-energy effective ghosts

Abstract

It has been suggested that a scalar field with negative kinetic energy, or ``ghost,'' could be the source of the observed late-time cosmological acceleration. Naively, such theories should be ruled out by the catastrophic quantum instability of the vacuum. We derive phenomenological bounds on the Lorentz-violating ultraviolet cutoff Lambda which must apply to low-energy effective theories of ghosts, in order to keep the instability at unobservable levels. Assuming only that ghosts interact at least gravitationally, we show that Lambda < 3 MeV for consistency with the cosmic gamma ray background. We also show that theories of ghosts with a Lorentz-conserving cutoff are completely excluded.

4 pages, 2 figures; fixed references. Version to appear in Phys.Rev.D

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• Big rip avoidance via black holes production
• Constraints on the radiation temperature before inflation
• Hyperbolic symmetries, inflaton-phantom cosmology, and inflation
• Covariant holography of a tachyonic accelerating universe
• Cherenkov radiation as ghost instability
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Phantom Crossing with Quintom Models
• Mean-field theory for self-interacting relativistic Luttinger fermions
• Quantum Quintom Cosmology
• Apocalypse When? Solar System Constraints on an Imminent Big Rip
• Does Holographic equipartition demand a pure cosmological constant?
• Phantom scalar field counterpart to Curzon-Chazy spacetime
• Scale-Invariant Bounce Cosmology in Weyl f(Q) Gravity with Quintom Signature
• Phantom Field from Conformal Invariance