Covariant long-distance modifications of Einstein theory and strong coupling problem

Journal Article · Fri Apr 15 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.084007· OSTI ID:20709078

Barvinsky, A O ^[1]

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1. Theory Department, Lebedev Physics Institute, Leninsky Prospect 53, Moscow 117924 (Russian Federation)

We present a generic form of the covariant nonlocal action for infrared modifications of Einstein theory recently suggested within the weak-field curvature expansion. In the lowest order it is determined by two nonlocal operators--kernels of Ricci tensor and scalar quadratic forms. In models with a low strong-coupling scale, this action also incorporates the strongly coupled mode which cannot be perturbatively integrated out in terms of the metric field. This mode enters the action as a Lagrange multiplier for the constraint on metric variables which reduces to the curvature scalar and enforces the latter to vanish on shell. Generic structure of the action is demonstrated on the examples of the Fierz-Pauli and Dvali-Gabadadze-Porrati models and their extensions. The gauge-dependence status of the strong-coupling and van Dam-Veltman-Zakharov problems is briefly discussed along with the manifestly gauge-invariant formalism of handling the braneworld gravitational models at classical and quantum levels.

• OSTI ID: 20709078
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACTION INTEGRAL
DISTANCE
GAUGE INVARIANCE
GENERAL RELATIVITY THEORY
RICCI TENSOR
SCALARS
STRONG-COUPLING MODEL