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Title: On the stability and causality of scalar-vector theories

Various extensions of standard inflationary models have been proposed recently by adding vector fields. Because they are generally motivated by large-scale anomalies, and the possibility of statistical anisotropy of primordial fluctuations, such models require to introduce non-standard couplings between vector fields on the one hand, and either gravity or scalar fields on the other hand. In this article, we study models involving a vector field coupled to a scalar field. We derive restrictive necessary conditions for these models to be both stable (Hamiltonian bounded by below) and causal (hyperbolic equations of motion)
Authors:
; ;  [1] ;  [2]
  1. Institut d'Astrophysique de Paris, CNRS UMR 7095, Université Pierre and Marie Curie—Paris VI, 98 bis Bd Arago, 75014 Paris (France)
  2. Departamento de Física, Universidad Antonio Nariño, Cra 3 Este # 47A-15, Bogotá DC (Colombia)
Publication Date:
OSTI Identifier:
22375728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; CAUSALITY; EQUATIONS OF MOTION; FLUCTUATIONS; GRAVITATION; HAMILTONIANS; SCALAR FIELDS; SCALARS; STABILITY; VECTOR FIELDS