Accelerating universe in two-dimensional noncommutative dilaton cosmology

Abstract

We show that the phase transition from the decelerating universe to the accelerating universe, which is of relevance to the cosmological coincidence problem, is possible in the semiclassically quantized two-dimensional dilaton gravity by taking into account the noncommutative field variables during the finite time. Initially, the quantum-mechanically induced energy from the noncommutativity among the fields makes the early universe decelerate and subsequently the universe is accelerating because the dilaton driven cosmology becomes dominant later.

14 pages, 2 figures; to appear in Phys. Lett. B

References in corpus (26)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• String Theory and Noncommutative Geometry
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Evanescent Black Holes
• The Cosmology of Generalized Modified Gravity Models
• The final state and thermodynamics of dark energy universe
• The Endpoint of Hawking Evaporation
• Equation of state for an interacting holographic dark energy model
• Liouville Models of Black Hole Evaporation
• Interacting Vector-like Dark Energy, the First and Second Cosmological Coincidence Problems
• Noncommutative Geometry and Cosmology
• Back Reaction and Graceful Exit in String Inflationary Cosmology
• Singularity and exit problems in two-dimensional string cosmology
• Effective action and Hawking radiation for dilaton coupled scalars in two dimensions
• Hawking Radiation and Unitary evolution
• Noncommutative open strings from Dirac quantization
• Hamiltonian Approach to 2D Dilaton-Gravities and Invariant Adm Mass
• Cosmological Models in Two Spacetime Dimensions
• Current Acceleration from Dilaton and Stringy Cold Dark Matter
• Gravitation \& Cosmology in $(1+1)$-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
• Transition from accelerated to decelerated regimes in JT and CGHS cosmologies

Cited by in corpus (4)

• Accelerated expansion in bosonic and fermionic 2D cosmologies with quantum effects
• Transition from AdS universe to DS universe in the BPP model
• Future singularity free accelerating expansion with the modified Poisson brackets
• Two non-commutative parameters and regular cosmological phase transition in the semi-classical dilaton cosmology