On the stability and causality of scalar-vector theories

Journal Article · Sat Nov 01 00:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/11/043· OSTI ID:22375728

Fleury, Pierre; Pitrou, Cyril; Uzan, Jean-Philippe ^[1]; Almeida, Juan P. Beltrán, ^[2]

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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)

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)

• OSTI ID: 22375728
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
CAUSALITY
EQUATIONS OF MOTION
FLUCTUATIONS
GRAVITATION
HAMILTONIANS
SCALAR FIELDS
SCALARS
STABILITY
VECTOR FIELDS