Matter perturbations in Einstein dark energy model

Abstract

We consider the growth rate of matter perturbations in the Einstein dark energy theory. The theory consists of the Einstien-Hilbert Lagrangian plus the trace of the energy momentum tensor, coupled non-minimally to a dynamical vector field. We will show that the theory has three fixed points corresponding to the dust, radiation and de Sitter universes. Due to the present of trace of the energy-momentum tensor in the Lagrangian, the fixed points occurs in different locations compared to $\Lambda$CDM theory. We will analyze the theory with and without cosmological constant. We will fit the model parameters using two independent data sets corresponding to the Hubble parameter $H$ and also $f{\sigma }_8$. The theory is then shown to be consistent with observational data.

arXiv comment11 pages, 6 figures

References in corpus (39)

• f(R,T) gravity
• Extra force in $f(R)$ modified theories of gravity
• f(R,L_m) gravity
• Reconstruction of some cosmological models in f(R,T) gravity
• Thermodynamics in f(R,T) Theory of Gravity
• f(R, T, R_μνT^μν) gravity phenomenology and ΛCDM universe
• Further matters in space-time geometry: $f(R,T,R_{\mu \nu }{T}^{\mu \nu })$ gravity
• Modified gravity with arbitrary coupling between matter and geometry
• Dynamics of scalar perturbations in f(R,T) gravity
• Cosmological and Solar System Consequences of f(R,T) Gravity Models
• Extending the Higgs sector: an extra singlet
• f(R,T) Cosmological Models in Phase Space
• Evolution of the $f{\sigma }_8$ tension with the Planck15/$\Lambda$CDM determination and implications for modified gravity theories
• Cosmology with Mimetic Matter
• Energy-Momentum Squared Gravity
• Rastall Cosmology and the ΛCDM Model
• Black Hole Solutions Surrounded by Perfect Fluid in Rastall Theory
• Neutron Stars in Rastall Gravity
• A Generalization to the Rastall Theory and Cosmic Eras
• Cosmological Models in Energy-Momentum-Squared Gravity
• Extended $f(R,L_m)$ gravity with generalized scalar field and kinetic term dependences
• Dynamical Instability and Expansion-free Condition in $f(R,T)$ Gravity
• Evolution of Axially Symmetric Anisotropic Sources in $f(R,T)$ Gravity
• Thermodynamics of flat FLRW universe in Rastall Theory
• Cosmic acceleration in dust only Universe via energy-momentum powered gravity
• Note on the Evolution of the Gravitational Potential in Rastall Scalar Field Theories
• Observational constraints on Rastall's cosmology
• How unimodular gravity theories differ from general relativity at quantum level
• The Brans-Dicke-Rastall theory
• Emergent cosmic space in Rastall theory
• Does Chaplygin gas have salvation?
• Unified Dark Energy and Dark Matter from Dynamical Space Time
• Consequences of energy conservation violation: Late time solutions of $\Lambda (T)CDM$ subclass of $f(R,T)$ gravity using dynamical system approach
• Non-trivial static, spherically symmetric vacuum solution in a non-conservative theory of gravity
• The Einstein dark energy model
• Dark energy and dark matter unification from dynamical space time: observational constraints and cosmological implications
• Growth of Matter Perturbations in the Bi-Galileons Field Model
• Cosmology with higher-derivative matter fields
• Cosmology in theories with derivative matter coupling

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