Two non-commutative parameters and regular cosmological phase transition in the semi-classical dilaton cosmology
arXiv:0708.1059 · doi:10.1142/S0217732308027047
Abstract
We study cosmological phase transitions from modified equations of motion by introducing two non-commutative parameters in the Poisson brackets, which describes the initial- and future-singularity-free phase transition in the soluble semi-classical dilaton gravity with a non-vanishing cosmological constant. Accelerated expansion and decelerated expansion corresponding to the FRW phase appear alternatively, and then it ends up with the second accelerated expansion. The final stage of the universe approaches the flat spacetime independent of the initial state of the curvature scalar as long as the product of the two non-commutative parameters is less than one. Finally, we show that the initial-singularity-free condition is related to the second accelerated expansion of the universe.
13 pages, 4 figures; v2. to appear in Mod. Phys. Lett. A
References in corpus (42)
- Dynamics of dark energy
- Phantom Energy and Cosmic Doomsday
- Can the dark energy equation-of-state parameter w be less than -1?
- Properties of singularities in (phantom) dark energy universe
- Evanescent Black Holes
- The Cosmology of Generalized Modified Gravity Models
- The final state and thermodynamics of dark energy universe
- Inflationary Cosmology
- The State of the Dark Energy Equation of State
- Quantum effects can render w<-1 on cosmological scales
- Super-Acceleration from Massless, Minimally Coupled
- Quantum escape of sudden future singularity
- The Endpoint of Hawking Evaporation
- Probing the dark side: Constraints on the dark energy equation of state from CMB, large scale structure and Type Ia supernovae
- Dynamical dark energy: Current constraints and forecasts
- Two Loop Scalar Self-Mass during Inflation
- Liouville Models of Black Hole Evaporation
- Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
- Current constraints on the dark energy equation of state
- Noncommutative Geometry and Cosmology
- Constraining the quintessence equation of state with SnIa data and CMB peaks
- Scalar-Tensor Quantum Gravity in Two Dimensions
- Noncommutativity in Field Space and Lorentz Invariance Violation
- Back Reaction and Graceful Exit in String Inflationary Cosmology
- Fadeev-Popov Ghosts and 1+1 Dimensional Black Hole Evaporation
- Singularity and exit problems in two-dimensional string cosmology
- Dilaton Gravity and No-Hair Theorem in Two Dimensions
- Effective action and Hawking radiation for dilaton coupled scalars in two dimensions
- Noncommutative open strings from Dirac quantization
- Hawking Radiation and Unitary evolution
- Hamiltonian Approach to 2D Dilaton-Gravities and Invariant Adm Mass
- Cosmological Models in Two Spacetime Dimensions
- Dilaton Quantum Cosmology in Two Dimensions
- S-Wave Scattering of Charged Fermions by a Magnetic Black Hole
- Gravitation \& Cosmology in -dimensional Dilaton Gravity
- Exact solutions in two-dimensional string cosmology with back reaction
- Initial singularity free quantum cosmology in two-dimensional Brans-Dicke theory
- Stability of a Noncommutative Jackiw-Teitelboim Gravity
- Graceful exit problem and stress-energy-momentum tensors revisited in the two-dimensional string cosmology
- Accelerating universe in two-dimensional noncommutative dilaton cosmology
- Thermodynamics of doubly charged CGHS model and D1-D5-KK black holes of IIB supergravity
- Future singularity free accelerating expansion with the modified Poisson brackets