Disformal couplings in a $\Lambda$CDM background cosmology

Abstract

The coupled quintessence model with disformal couplings is treated here to mimic the $\Lambda$CDM background. Using this approach, the quintessence potential does not have to be specified. The model considers a generic fluid coupled to the quintessence, which is specified to be either dark matter or a relativistic fluid. The background consists of a cosmological constant and another uncoupled generic fluid, to cater for three studied scenarios. The cosmological dynamics is investigated for the coupled quintessence model, whose disformal couplings depend on the equation of state of both generic fluids. The scenario, whereby both generic fluids are dark matter, was further analyzed for an expansion history of the mimicking model. The analysis confirms that the mass scale of the quintessence influences the disformal characteristics of the dynamical system, which is portrayed by the evolution of an effective conformal coupling.

arXiv comment32 pages, 11 figures, 5 tables, Version published in JCAP03(2021)002, minor changes

References in corpus (21)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Modified Gravity and Cosmology
• Coupled Quintessence
• Cosmological Parameters from Observations of Galaxy Clusters
• Generalization of the Fierz-Pauli Action
• Transforming gravity: from derivative couplings to matter to second-order scalar-tensor theories beyond the Horndeski Lagrangian
• The Relation between Physical and Gravitational Geometry
• Disformal invariance of second order tensor-scalar theories: framing the Horndeski action
• Self-similar cosmological solutions with a non-minimally coupled scalar field
• Disformal couplings and the dark sector of the universe
• Interacting quintessence from a variational approach Part II: derivative couplings
• Testing coupled dark energy models with their cosmological background evolution
• Dynamics of interacting quintessence
• Constraints on Disformal Couplings from the Properties of the Cosmic Microwave Background Radiation
• Higher dimensional nonlinear massive gravity
• Coupled quintessence and the impossibility of an interaction: a dynamical analysis study
• Can Conformal and Disformal Couplings Between Dark Sectors Explain the EDGES 21cm Anomaly?
• Disformally Coupled Scalar Fields and Inspiralling Trajectories
• Disformally Coupled Quintessence
• Spherical collapse in coupled quintessence with a $\Lambda$CDM background
• Bigravity and Horndeski gravity connected by a disformal coupling

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