Bouncing Universes with Varying Constants

Abstract

We investigate the behaviour of exact closed bouncing Friedmann universes in theories with varying constants. We show that the simplest BSBM varying-alpha theory leads to a bouncing universe. The value of alpha increases monotonically, remaining approximately constant during most of each cycle, but increasing significantly around each bounce. When dissipation is introduced we show that in each new cycle the universe expands for longer and to a larger size. We find a similar effect for closed bouncing universes in Brans-Dicke theory, where $G$ also varies monotonically in time from cycle to cycle. Similar behaviour occurs also in varying speed of light theories.

References in corpus (20)

• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Essentials of k-essence
• The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
• The fundamental constants and their variation: observational status and theoretical motivations
• A Search for Time Variation of the Fine Structure Constant
• A time varying speed of light as a solution to cosmological puzzles
• Timelike T-Duality, de Sitter Space, Large $N$ Gauge Theories and Topological Field Theory
• Superluminary Universe: A Possible Solution to the Initial Value Problem in Cosmology
• Possible evidence for a variable fine structure constant from QSO absorption lines: motivations, analysis and results
• Limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars
• A Simple Varying-alpha Cosmology
• Cosmologies with Varying Light-Speed
• New varying speed of light theories
• Covariant and locally Lorentz-invariant varying speed of light theories
• On the Stability of the Einstein Static Universe
• Big Crunch Avoidance in k = 1 Semi-Classical Loop Quantum Cosmology
• Is it e or is it c? Experimental Tests of Varying Alpha
• Stars and black holes in varying speed of light theories
• Could thermal fluctuations seed cosmic structure?
• Qualitative Analysis of Universes with Varying Alpha

Cited by in corpus (86)

• Modified Gravity and Cosmology
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• A Critical Review of Classical Bouncing Cosmologies
• Towards a Resolution of the Cosmological Singularity in Non-local Higher Derivative Theories of Gravity
• $f(T)$ Theories and Varying Fine Structure Constant
• Einstein Static Universe in Exponential $f(T)$ Gravity
• Constraints on the Variation of G from Primordial Nucleosynthesis
• Extended matter bounce scenario in ghost free $f(R,\mathcal{G})$ gravity compatible with GW170817
• Cosmological particle production in emergent rainbow spacetimes
• Observational Constraints on $f(T)$ gravity from varying fundamental constants
• Decaying Gravity
• Generalized teleparallel cosmology and initial singularity crossing
• Inflation with a Negative Cosmological Constant
• General Dynamics of Varying-Alpha Universes
• From a Bounce to the Dark Energy Era with $F(R)$ Gravity
• The Ups and Downs of Cyclic Universes
• The Degree of Fine-Tuning in our Universe -- and Others
• Varying Constants
• Cosmological Bounds on Spatial Variations of Physical Constants
• The cosmological BCS mechanism and the Big Bang Singularity
• Patch dualities and remarks on nonstandard cosmologies
• On the stability of static ghost cosmologies
• Stability of the Einstein static universe in presence of vacuum energy
• Rainbow metric from quantum gravity
• Bounce cosmology in $f(\mathcal{R})$ gravity
• Non-singular Bounce Cosmology from Lagrange Multiplier $F(R)$ Gravity
• Anisotropic Cosmological Model in Modified Brans--Dicke Theory
• Deformed Matter Bounce with Dark Energy Epoch
• Wiggles in the cosmic microwave background radiation: echoes from non-singular cyclic-inflation
• Equation of state for Universe from similarity symmetries
• Cyclic Mixmaster Universes
• Varying Couplings in Electroweak Theory
• Varying-Alpha Cosmologies with Potentials
• The Local Effects of Cosmological Variations in Physical 'Constants' and Scalar Fields I. Spherically Symmetric Spacetimes
• Cosmology and Cosmogony in a Cyclic Universe
• Local Experiments See Cosmologically Varying Constants
• Exact solutions in bouncing cosmology
• Emergent Universe from Energy-Momentum Squared Gravity
• Noncommutative minisuperspace, gravity-driven acceleration and kinetic inflation
• Cyclic Inflation
• The Local Effects of Cosmological Variations in Physical 'Constants' and Scalar Fields II. Quasi-Spherical Spacetimes
• FRW Cosmology From Five Dimensional Vacuum Brans-Dicke Theory
• Early Universe Dynamics in Semi-Classical Loop Quantum Cosmology
• Fixed points and FLRW cosmologies: Flat case
• Can the initial singularity be detected by cosmological tests?
• PeV IceCube signals and Dark Matter relic abundance in modified cosmologies
• On Dynamics of Brans--Dicke Theory of Gravitation
• Horizon Problem Remediation via Deformed Phase Space
• Exploring eternal stability with the simple harmonic universe
• Conformal relativity versus Brans-Dicke and superstring theories
• Varying Alpha Driven by the Dirac-Born-Infeld Scalar Field
• Aspects of non-singular bounce in modified gravity theories
• Evolution of Cyclic Mixmaster Universes with Non-comoving Radiation
• Inflation and Bounce from Classical and Loop Quantum Cosmology Imperfect Fluids
• Cosmological models with Gurzadyan-Xue dark energy
• Bouncing Anisotropic Universes with Varying Constants
• Dark Energy From Fifth Dimensional Brans-Dicke Theory
• Testing and selection of cosmological models with $(1+z{)}^6$ corrections
• Acceleration of the Universe driven by the Casimir force
• Evolution of initially contracting Bianchi Class A models in the presence of an ultra-stiff anisotropic pressure fluid
• A Cyclic Universe Approach to Fine Tuning
• Rippled Cosmological Dark Matter from Damped Oscillating Newton Constant
• Newtonian Potential and Geodesic Completeness in Infinite Derivative Gravity
• Viable non-singular cosmic bounce in holonomy improved F(R) gravity endowed with a Lagrange multiplier
• Weyl Anomaly and Initial Singularity Crossing
• The Shape of Bouncing Universes
• Cyclic multiverses
• Observational Constraints on Varying Alpha in $\Lambda (\alpha )$CDM Cosmology
• Emergent Universe in f(Q) gravity theories
• Reconstructing the Universe Evolution from Loop Quantum Cosmology Scalar Fields
• Quantum gravity might restrict a cyclic evolution
• Cyclic Szekeres Universes
• Loop Quantum Cosmology Scalar Field Models
• Universe acceleration and fine structure constant variation in BSBM theory
• Non-linear interactions in cosmologies with energy exchange
• Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests
• Observable Effects of Scalar Fields and Varying Constants
• Kinematical and dynamical aspects of ghost-matter cosmologies
• Unraveling the mystery of the cosmological constant: Does spacetime uncertainty hold the key?
• Certain aspects of regularity in scalar field cosmological dynamics
• Loop Quantum Cosmology and the Fine Structure Constant
• Conformal transformation route to gravity's rainbow
• Cosmological Singularities in Brane Gravity
• Can the scale factor be rippled?
• Gauss-Bonnet Gravity and Spacetime Singularities
• A Breathing Universe is Consistent