GRAVITATIONAL ORIGIN OF PHANTOM DARK ENERGY AND LATE COSMIC ACCELERATION

2006/05/31 by S. K. Srivastava, S. K. SRIVASTAVA
Physics and Astronomy · #Acceleration #Barotropic fluid #Black Holes and Theoretical Physics #Chaplygin gas #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Equation of state #Friedmann equations #Noncommutative and Quantum Gravity Theories #Phantom energy #Scalar field #astro-ph #gr-qc #hep-th

paper · pdf · doi:10.1142/s0217751x07035094

published as Int.J.Mod.Phys.A22:1123-1134,2007 · 16 pages

openalex publication_date 2007/03/10 · arxiv created 2007/03/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Here, dark energy is obtained using dual roles of the Ricci scalar (as a physical field as well as geometry). Dark energy density, obtained in this model, mimics phantom and the derived Friedmann equation contains a term [Formula: see text] with ρ de being the dark energy density and λ, called as cosmic tension. It is like brane-gravity inspired Friedmann equation, which arises here without using the brane-gravity theory. It is found that acceleration is a transient phenomenon for λ< 0, but for λ> 0 accelerated expansion is found to encounter the big-rip problem. It is shown that this problem can be avoided if the dark energy behaves as barotropic fluid and generalized Chaplygin gas simultaneously. Moreover, time for transition (from deceleration to acceleration of the universe) is derived as a function of equation of state parameter w de = p de /ρ de with p de being the pressure for dark energy fluid.

Citations

• Phantom Energy: Dark Energy withw<−1Causes a Cosmic Doomsday
• First Estimations of Cosmological Parameters From BOOMERANG
• A Measurement of the Angular Power Spectrum of the Cosmic Microwave Background from [CLC][ITAL]l[/ITAL][/CLC] = 100 to 400
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• You need not be afraid of phantom energy
• Palatini formulation of modified gravity with lnR terms
• Tachyon couplings on non-BPS D-branes and Dirac-Born-Infeld action
• Phenomenology of a Realistic Accelerating Universe Using Only Planck-Scale Physics
• Quantum effects can renderw<−1on cosmological scales
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Modified Gauss-Bonnet theory as gravitational alternative for dark energy
• A Measurement of Ω from the North American Test Flight of Boomerang
• Evolution of the scale factor with a variable cosmological term
• Generalized Chaplygin gas, accelerated expansion, and dark-energy-matter unification
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Is cosmic speed-up due to new gravitational physics?
• Cosmological consequences of a rolling homogeneous scalar field
• Reconciling dark energy models withf(R)theories
• Kinetically driven quintessence
• Curvature Quintessence
• k-Inflation