Ghosts, Instabilities, and Superluminal Propagation in Modified Gravity Models

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dc.creatorDe Felice, Antonio
dc.creatorHindmarsh, Mark
dc.creatorTrodden, Mark
dc.date2006-04-07
dc.date2006-09-04
dc.date.accessioned2026-07-07T07:04:36Z
dc.date.available2026-07-07T07:04:36Z
dc.descriptionWe consider Modified Gravity models involving inverse powers of fourth-order curvature invariants. Using these models' equivalence to the theory of a scalar field coupled to a linear combination of the invariants, we investigate the properties of the propagating modes. Even in the case for which the fourth derivative terms in the field equations vanish, we find that the second derivative terms can give rise to ghosts, instabilities, and superluminal propagation speeds. We establish the conditions which the theories must satisfy in order to avoid these problems in Friedmann backgrounds, and show that the late-time attractor solutions are generically afflicted by superluminally propagating tensor or scalar modes.
dc.description17 pages, 1 figure, uses RevTeX. Added a few comments. Changed the figure
dc.identifierhttps://arxiv.org/abs/astro-ph/0604154
dc.identifierhttp://arxiv.org/abs/astro-ph/0604154
dc.identifierJCAP 0608 (2006) 005
dc.identifierdoi:10.1088/1475-7516/2006/08/005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109379
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleGhosts, Instabilities, and Superluminal Propagation in Modified Gravity Models
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