Unified dark energy thermodynamics: varying w and the -1-crossing

Abstract

We investigate, in a unified and general way, the thermodynamic properties of dark energy with an arbitrary, varying equation-of-state parameter w(a). We find that all quantities are well defined and regular for every w(a), including at the -1-crossing, with the temperature being negative in the phantom regime (w(a)<-1) and positive in the quintessence one (w(a)>-1). The density and entropy are always positive while the chemical potential can be arbitrary. At the -1-crossing, both temperature and chemical potential are zero. The temperature negativity can only be interpreted in the quantum framework. The regular behavior of all quantities at the -1-crossing, leads to the conclusion that such a crossing does not correspond to a phase transition, but rather to a smooth cross-over.

arXiv comment5 pages, version published in Class. Quant. Grav

References in corpus (40)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• 4D Gravity on a Brane in 5D Minkowski Space
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• Cosmology and the Fate of Dilatation Symmetry
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• Phantom Energy and Cosmic Doomsday
• Modified gravity with negative and positive powers of the curvature: unification of the inflation and of the cosmic acceleration
• Curvature Quintessence
• Dark Energy Constraints from the Cosmic Age and Supernova
• Non-conventional cosmology from a brane-universe
• Quantum deSitter cosmology and phantom matter
• Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
• Cosmological Evolution of a Quintom Model of Dark Energy
• The phantom menaced: constraints on low-energy effective ghosts
• A classification of scalar field potentials with cosmological scaling solutions
• Black hole mass decreasing due to phantom energy accretion
• Quantum effects can render w<-1 on cosmological scales
• Effective equation of state and energy conditions in phantom/tachyon inflationary cosmology perturbed by quantum effects
• Quintom models with an equation of state crossing -1
• Coupled oscillators as models of quintom dark energy
• Phantom thermodynamics
• Parametrizations of the Dark Energy Density and Scalar Potentials
• Quintom model with O($N$) symmetry
• Thermodynamics, Spectral Distribution and the Nature of Dark Energy
• Duality Cascade in Brane Inflation
• Probing supernova shock waves and neutrino flavor transitions in next-generation water-Cherenkov detectors
• Effects of dark sectors' mutual interaction on the growth of structures
• Braneworld models with a non-minimally coupled phantom bulk field: a simple way to obtain the -1-crossing at late times
• Phantom field dynamics in loop quantum cosmology
• Search for 14.4 keV solar axions emitted in the M1-transition of 57Fe nuclei with CAST
• On Phantom Thermodynamics
• Mirage effects on the brane
• Coupling constant constraints in a nonminimally coupled phantom cosmology
• Chemical Potential and the Nature of the Dark Energy: The case of phantom
• On phantom thermodynamics with negative temperature
• Statistical Approach to the Cosmological-Constant Problem on Brane Worlds
• On the problem of equation of state for the $\Lambda$ - field

Cited by in corpus (52)

• Thermodynamics of dark energy interacting with dark matter and radiation
• Palatini formulation of $f(R,T)$ gravity theory, and its cosmological implications
• Noether symmetry approach in phantom quintessence cosmology
• The generalized second law of thermodynamics in Horava-Lifshitz cosmology
• Thermodynamics in $f(R)$ gravity in the Palatini formalism
• Irreversible thermodynamic description of interacting dark energy - dark matter cosmological models
• The past and future dynamics of quintom dark energy models
• A Completely Regular Quantum Stress Tensor with $w<-1$
• Thermodynamical correspondence of $f(R)$ gravity in Jordan and Einstein frames
• Gravitinos Tunneling From Traversable Lorentzian Wormholes
• Double shadow of a regular phantom black hole as photons couple to Weyl tensor
• Generalized second law of thermodynamics for a phantom energy accreting BTZ black hole
• Cosmological evolution and dark energy in osculating Barthel-Randers geometry
• Preventing eternality in phantom inflation
• Thermodynamics of Fractal Universe
• Accretion of Phantom Energy and Generalized Second Law of Thermodynamics for Einstein-Maxwell-Gauss-Bonnet Black Hole
• Gravitational field of a slowly rotating black hole with phantom global monopole
• Thermodynamics and dark energy
• A thermodynamics revision of Rastall gravity
• Cosmological Analysis of Pilgrim Dark Energy in Loop Quantum Cosmology
• Thermodynamically allowed phantom cosmology with viscous fluid
• Modeling holographic dark energy with particle and future horizons
• General treatment for dark energy thermodynamics
• Gravitationally induced matter creation in scalar-tensor $f(R,T_{\mu \nu }{T}^{\mu \nu })$ gravity
• Brane Cosmology with the Chameleon Scalar Field in Bulk
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• Cosmology with Negative Absolute Temperatures
• Validity of Generalized Second Law of Thermodynamics in the Logamediate and Intermediate scenarios of the Universe
• Holographic dark energy and validity of the generalized second law of thermodynamics in the dgp brane world
• Falsifying Field-based Dark Energy Models
• Lorentzian wormholes generalizes thermodynamics still further
• Generalized second law of thermodynamics in QCD ghost f(G) gravity
• A statistical representation of the cosmological constant from finite size effects at the apparent horizon
• Testing gravity of a regular and slowly rotating phantom black hole by quasi-periodic oscillations
• Entropy, energy and temperature-length inequality for Friedmann universes
• Planckian corrections to the Friedmann flat equations from thermodynamics at the apparent horizon
• Aspects of Some New Versions of Pilgrim Dark Energy in DGP Braneworld
• A new approach to $P-V$ phase transitions: Einstein gravity and holographic type dark energy
• Generalized second law of thermodynamics for the matter creation scenario and emergence of phantom regime
• The Unified First law in "Cosmic Triad" Vector Field Scenario
• From Barthel Randers Kropina Geometries to the Accelerating Universe: A Brief Review of Recent Advances in Finslerian Cosmology
• Analog Schwarzschild-like geometry in fluids with external pressure
• Thermodynamics of viscous dark energy for the late future time universe
• Thermodynamics of a transient phantom scenario
• Hawking radiation and thermodynamics of dynamical black holes in phantom dominated universe
• A general thermodynamical description of the event horizon in the FRW universe
• A Thermodynamic Model for Dark Energy Including Particle Creation or Destruction Processes
• Exploring the expansion of the universe using the Grüneisen parameter
• Constraints on the radiation temperature before inflation
• Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid
• Dark Energy Density and IS (Israel-Stewart) Bulk Viscosity Model
• Thermodynamics properties of the dark energy in loop quantum cosmology