Noether gauge symmetry approach in quintom cosmology

Abstract

In literature usual point like symmetries of the Lagrangian have been introduced to study the symmetries and the structure of the fields. This kind of Noether symmetry is a subclass of a more general family of symmetries, called Noether Gauge Symmetries (NGS). Motivated by this mathematical tool, in this article, we discuss the generalized Noether symmetry of Quintom model of dark energy, which is a two component fluid model of quintessence and phantom fields. Our model is a generalization of the Noether symmetries of a single and multiple components which have been investigated in detail before. We found the general form of the quintom potential in which the whole dynamical system has a point like symmetry. We investigated different possible solutions of the system for diverse family of gauge function. Specially, we discovered two family of potentials, one corresponds to a free quintessence (phantom) and the second is in the form of quadratic interaction between two components. These two families of potential functions are proposed from the symmetry point of view, but in the quintom models they are used as phenomenological models without clear mathematical justification. From integrability point of view, we found two forms of the scale factor: one is power law and second is de-Sitter. Some cosmological implications of the solutions have been investigated

23 Pages, 4 Figures, Published in "Astrophysics and Space Science"

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• Wheeler-DeWitt equation and Lie symmetries in Bianchi scalar-field cosmology
• Noether symmetry in the Nash theory of gravity
• Noether symmetry in Horndeski Lagrangian
• Gravitational Collapse With Dark Energy And Dark Matter In Hořava-Lifshitz Gravity
• Quadratic integrals of a multi-scalar cosmological model
• Closed-form solutions of the Wheeler-DeWitt equation in a scalar-vector field cosmological model by Lie symmetries
• Noether Symmetry Approach in Eddington-inspired Born-Infeld gravity
• Noether symmetry approach in non-minimal derivative coupling gravity