A Cyclic Universe With Varying Cosmological Constant in gravity
arXiv:1902.03104 · doi:10.1139/cjp-2018-0635
Abstract
A new kind of evolution for cyclic models in which the Hubble parameter oscillates and keeps positive has been explored in a specific gravity reconstruction. A singularity-free cyclic universe with negative varying cosmological constant has been obtained which supports the role suggested for negative in stopping the eternal acceleration. The cosmological solutions have been obtained for the case of a flat universe, supported by observations. The cosmic pressure grows without singular values, it is positive during the early-time decelerated expansion and negative during the late-time accelerating epoch. The time varying EoS parameter shows a quintom behavior and is restricted to the range . The validity of the classical linear energy conditions and the sound speed causality condition has been studied. The non-conventional mechanism of negative cosmological constant that are expected to address the late-time acceleration has been discussed.
15 pages, 10 figures
References in corpus (23)
- f(R,T) gravity
- Dark torsion as the cosmic speed-up
- Modified teleparallel gravity: inflation without inflaton
- Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
- Can dark energy evolve to the Phantom?
- Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
- Bouncing Universe with Quintom Matter
- Energy conditions in the epoch of galaxy formation
- Friedmann Equations and Thermodynamics of Apparent Horizons
- From inflation to dark energy in the non-minimal modified gravity
- Turnaround in Cyclic Cosmology
- Why the cosmological constant is small and positive
- LXCDM: a cosmon model solution to the cosmological coincidence problem?
- Probing for dynamics of dark energy and curvature of universe with latest cosmological observations
- Oscillating universe with quintom matter
- Inflation with a Negative Cosmological Constant
- Accelerated and decelerated expansion in a causal dissipative cosmology
- Cosmic acceleration with a negative cosmological constant in higher dimensions
- Dynamical effects of the scale invariance of the empty space: The fall of dark matter ?
- Oscillating universe in massive gravity
- Gaugino condensation in an improved heterotic M-theory
- Negative Energy Cosmology and the Cosmological Constant
- Cosmology In Terms Of The Deceleration Parameter. Part II