Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance

Abstract

We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity when the scalar field has a nonconformal coupling to the Ricci scalar. We prove that bouncing universes regular in the future with essentially the same dynamics as for the conformal coupling case do exist when the coupling deviates slightly from it. This is found numerically for more substantial deviations as well. In some cases however new features are found like the ability of the system to leave the effective phantom regime.

15 pages, 13 figures; Added references, version to appear in JCAP

References in corpus (9)

• Quantum Nature of the Big Bang: Improved dynamics
• Towards a Nonsingular Bouncing Cosmology
• A Critical Review of Classical Bouncing Cosmologies
• The Measure Problem in Cosmology
• Harrison--Zeldovich spectrum from conformal invariance
• Conformally Coupled Scalars, Instantons and Vacuum Instability in AdS_4
• Bouncing Universes in Scalar-Tensor Gravity Models admitting Negative Potentials
• What $\xi$? Cosmological constraints on the non-minimal coupling constant
• Fermionic influence (action) on inflationary fluctuations

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• Bouncing Cosmological Isotropic Solutions in Scalar-Tensor Gravity
• On the emergence of the $\mathbf{\Lambda }$CDM model from self-interacting Brans-Dicke theory in $\mathbf{d}=5$
• Running of the Spectral index in Deformed Matter Bounce Scenarios with Hubble-rate-dependent Dark Energy
• Cosmological Dark sector from a Mimetic-Metric-Torsion perspective
• Anisotropic Conformal Dark Gravity on the Lorentz Tangent Bundle Spacetime
• Loop quantum cosmological dynamics of scalar-tensor theory in the Jordan frame
• Transitioning from a bounce to $R^2$ inflation
• Induced gravity models with exact bounce solutions
• New Integrable Chiral Cosmological Models with Two Scalar Fields
• Integrable cosmological models with non-minimal coupling and bounce solutions