Cuscuton-like contribution to dark energy evolution

Abstract

This work deals with the presence of the cuscuton term in the otherwise standard dark energy evolution under the usual FLRW background. We disclose a first-order framework similar to the Hamilton-Jacobi formalism, which helps us to solve the equations of motion and find analytical solutions. We explore several possibilities, concentrating mainly on how the cuscuton-like contribution works to modify cosmic evolution. Some results are of current interest since they describe scenarios capable of changing the evolution, adding or excluding possible distinct phases during the Universe's expansion history. Additionally, we present interesting constraints on the cuscuton-like contribution for the dark energy evolution using a set of homogeneous geometrical observational probes. Finally, based on the Akaike Information Criterion (AIC), we perform a statistical comparison of the cuscuton-like model with $\Lambda$CDM, and find strong support for our model.

16 pages, 09 figures, 01 table. To appear in EPJC

References in corpus (21)

• Dynamics of dark energy
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Healthy theories beyond Horndeski
• Horndeski theory and beyond: a review
• Exploring gravitational theories beyond Horndeski
• Large Scale Structure as a Probe of Gravitational Slip
• Cuscuton: A Causal Field Theory with an Infinite Speed of Sound
• Cuscuton Cosmology: Dark Energy meets Modified Gravity
• First-order formalism for bent brane
• Cuscuton and low energy limit of Horava-Lifshitz gravity
• Scalar fields, bent branes, and RG flow
• Hamilton-Jacobi method for Domain Walls and Cosmologies
• Cuscuton gravity as a classically stable limiting curvature theory
• Caustics for Spherical Waves
• Observational Constraints on Dynamical Dark Energy Models
• K-field kinks in two-dimensional dilaton gravity
• Dressed Power-law Inflation with Cuscuton
• Cuscuta-Galileon cosmology: Dynamics, gravitational "constant"s and the Hubble Constant
• Inflation and late-time accelerated expansion driven by $k$-essence degenerate dynamics
• Models of modified $F(R,T)$ and cuscuton braneworld

Cited by in corpus (1)

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