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On the stability and causality of scalar-vector theories

Abstract : 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).
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Submitted on : Tuesday, April 19, 2022 - 3:30:35 PM
Last modification on : Friday, August 5, 2022 - 11:55:13 AM

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Pierre Fleury, Juan P. Beltrán Almeida, Cyril Pitrou, Jean-Philippe Uzan. On the stability and causality of scalar-vector theories. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2014, 2014, ⟨10.1088/1475-7516/2014/11/043⟩. ⟨insu-03645254⟩

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