Decaying Gravity

Abstract

We consider the possibility of energy being exchanged between the scalar and matter fields in scalar-tensor theories of gravity. Such an exchange provides a new mechanism which can drive variations in the gravitational 'constant' G. We find exact solutions for the evolution of spatially flat Friedman-Roberston-Walker cosmologies in this scenario and discuss their behaviour at both early and late times. We also consider the physical consequences and observational constraints on these models.

13 pages

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Cited by in corpus (44)

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• Accelerating Cold Dark Matter Cosmology (${\Omega }_{\Lambda }\equiv 0$)
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• Interacting dark energy in $f(R)$ gravity
• Conservation laws in theories with universal gravity/matter coupling
• Interacting Dark Energy in f(T) cosmology : A Dynamical System analysis
• Cosmic acceleration without dark energy: Background tests and thermodynamic analysis
• The Ups and Downs of Cyclic Universes
• The transient acceleration from time-dependent interacting dark energy models
• Interacting new generalized Chaplygin gas
• Constraining chameleon field driven warm inflation with Planck 2018 data
• Classical and Quantum Solutions in Brans-Dicke Cosmology with a Perfect Fluid
• $\gamma$ Parameter and Solar System constraint in Chameleon Brans Dick Theory
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• Fixed points in interacting dark energy models
• Modified Brans-Dicke cosmology with matter-scalar field interaction
• An Interacting model of Dark Energy in Brans-Dicke theory
• Infinity in string cosmology: A review through open problems
• Brans-Dicke cosmology mimicking running vacuum
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• Generalised scalar-tensor theory and the cosmic acceleration
• Singularities in cosmologies with interacting fluids
• Exact Solutions and Accelerating Universe in Modified Brans-Dicke Theories
• Power-law solutions and accelerated expansion in scalar-tensor theories
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• On the action of the complete Brans-Dicke theory
• Regular Bouncing Solutions, Energy Conditions and the Brans-Dicke Theory
• Cosmic Variation of Proton to Electron Mass Ratio with an interacting Higgs Scalar Field
• On the holographic dark energy in chameleon scalar-tensor cosmology
• Is interacting vacuum viable?
• Cosmic Acceleration in an Extended Brans-Dicke-Higgs Theory
• Dynamics of self-gravitating systems in non-linearly magnetized chameleonic Brans-Dicke gravity
• Dynamics of cosmological perturbations in modified Brans-Dicke cosmology with matter-scalar field interaction
• Time Evolution of the Matter Content of the Expanding Universe in the Framework of Brans-Dicke Gravity
• Functions of State for Spinor Gas in General Relativity
• (Non-) geodesic motion in chameleon Brans Dicke model
• Comments on ${}^{"}$Cosmic evolution in Brans-Dicke chameleon cosmology${}^{"}$
• A Study on the Expanding Universe Based on a Model of the Time Variation of its Matter Content in the Framework of Brans-Dicke Theory
• A New Interpretation of Einstein's Cosmological Constant
• Anomaly Induced Effective Action Combined with Generalized Brans-Dicke Theory