Complex Scalar fields in Scalar-Tensor and Scalar-Torsion theories

Abstract

We investigate the cosmological dynamics in a spatially flat Friedmann--Lema\^ıtre--Robertson--Walker geometry in scalar-tensor and scalar-torsion theories where the nonminimally coupled scalar field is a complex field. We derive the cosmological field equations and we make use of dimensionless variables in order to determine the stationary points and determine their stability properties. The physical properties of the stationary points are discussed while we find that the two-different theories, scalar-tensor and scalar-torsion theories, share many common features in terms of the evolution of the physical variables in the background space.

19 pages, 5 figures, to appear in Mod. Phys. Lett. A

References in corpus (5)

• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Multiple field inflation
• Unified Dark Matter Scalar Field Models
• Triple unification of inflation, dark matter, and dark energy using a single field
• Some remarks about non-minimally coupled scalar field models

Cited by in corpus (4)

• Testing an oscillatory behavior of dark energy
• Cosmological Dynamics in Interacting Scalar-Torsion f(T,$\varphi$) Gravity: Investigating Energy and Momentum Couplings
• Kantowski-Sachs cosmology in scalar-torsion theory
• The scalar-torsion gravity corrections in the first-order inflationary models