Testing dark energy beyond the cosmological constant barrier

Abstract

Although well motivated from theoretical arguments, the cosmological constant \emph{barrier}, i.e., the imposition that the equation-of-state parameter of dark energy (${\omega }_x\equiv p_x/{\rho }_x$) is $\ge -1$, seems to introduce bias in the parameter determination from statistical analyses of observational data. In this regard, \emph{phantom} dark energy or \emph{superquintessence} has been proposed in which the usual imposition $\omega \ge -1$ is relaxed. Here, we study possible observational limits to the \emph{phantom} behavior of the dark energy from recent distance estimates of galaxy clusters obtained from interferometric measurements of the Sunyaev-Zel'dovich effect/X-ray observations, Type Ia supernova data and CMB measurements. We find that there is much \emph{observationally} acceptable parameter space beyond the $\Lambda$ \emph{barrier}, thus opening the possibility of existence of more exotic forms of energy in the Universe.

5 pages, 5 figures, to appear in Phys. Rev. D

References in corpus (3)

• Cosmological Dynamics of Phantom Field
• Nearly Scale-Invariant Spectrum of Adiabatic Fluctuations May be from a Very Slowly Expanding Phase of the Universe
• Observational Bounds on Cosmic Doomsday

Cited by in corpus (102)

• Late-time cosmology in (phantom) scalar-tensor theory: dark energy and the cosmic speed-up
• Phantom energy traversable wormholes
• Wormholes supported by a phantom energy
• Extended tachyon field, Chaplygin gas and solvable k-essence cosmologies
• Cosmological parameters from supernova observations: A critical comparison of three data sets
• A parametric model for dark energy
• Constraints on linear-negative potentials in quintessence and phantom models from recent supernova data
• The Fate of Bound Systems in Phantom and Quintessence Cosmologies
• Entropy and universality of Cardy-Verlinde formula in dark energy universe
• The stability of modified gravity models
• Solar System experiments do not yet veto modified gravity models
• Crossing the Phantom Divide Barrier with Scalar Tensor Theories
• Interpreting Cosmological Vacuum Decay
• Exploring Cosmological Expansion Parametrizations with the Gold SnIa Dataset
• Phantom Inflation and Primordial Perturbation Spectrum
• Phantom thermodynamics
• Quasinormal modes of gravitational perturbation around a Schwarzschild black hole surrounded by quintessence
• Anisotropic compact stars in $f(R)$ gravity
• New asymptotically flat phantom wormhole solutions
• Thermodynamics, Spectral Distribution and the Nature of Dark Energy
• Phantom k-essence cosmologies
• Energy Conditions and Cosmic Acceleration
• Smooth dynamical (de)-phantomization of a scalar field in simple cosmological models
• On the Geometry of Dark Energy
• Evolving Newton's Constant, Extended Gravity Theories and SnIa Data Analysis
• Modified gravity and the stability of de Sitter space
• Escaping the Big Rip?
• Current constraints on interacting holographic dark energy
• Non-minimal coupling, exponential potentials and the $w<-1$ regime of dark energy
• Dark energy transition between quintessence and phantom regimes - an equation of state analysis
• A generalized equation of state for dark energy
• Achronal cosmic future
• Energy Conditions and Supernovae Observations
• Observational constraints on late-time Lambda(t) cosmology
• On the Stability of Phantom K-essence Theories
• Can dark energy be expressed as a power series of the Hubble parameter?
• Phantom inflation and the "Big Trip"
• Constraints on the DGP Model from Recent Supernova Observations and Baryon Acoustic Oscillations
• Energy Conditions and Segre Classification of Phantom Fields
• Supernova constraints on decaying vacuum cosmology
• Cosmological consequences of a possible $\Lambda$-dark matter interaction
• Lookback time bounds from energy conditions
• Testing power-law cosmology with galaxy clusters
• Triality between Inflation, Cyclic and Phantom Cosmologies
• Supernova constraints on alternative models to dark energy
• Age constraints on the cosmic equation of state
• Analytic rotating black hole solutions in $N$-dimensional $f(T)$ gravity
• Energy conditions constraints on a class of f(R)-gravity
• Scalar wormholes in cosmological setting and their instability
• Variable Equation of State for Generalized Dark Energy Model
• Exotic solutions in General Relativity: Traversable wormholes and 'warp drive' spacetimes
• Probing the time dependence of dark energy
• Coupled quintessence and vacuum decay
• Can high-redshift Hubble diagrams rule out the standard model of cosmology in the context of cosmographic method?
• Agegraphic dark energy: growth index and cosmological implications
• Construction of 3D wormhole supported by phantom energy
• Constraining $H_0$ from Sunyaev-Zel'dovich effect, Galaxy Clusters X-ray data, and Baryon Oscillations
• Thermodynamics and dark energy
• Extended quintessence, inflation, and stable de Sitter spaces
• Cosmology with interaction in the dark sector
• Reconstructing the history of dark energy using maximum entropy
• Non-chaotic dynamics in general-relativistic and scalar-tensor cosmology
• Model for a Universe described by a non-minimally coupled scalar field and interacting dark matter
• The Deformable Universe
• Will black holes eventually engulf the universe?
• Reconstruction of scalar potentials in two-field cosmological models
• The Influence of Free Quintessence on Gravitational Frequency Shift and Deflection of Light with 4D momentum
• Spherical collapse model and cluster number counts in power law $f(T)$ gravity
• Observational constraints on the oscillating dark energy cosmologies
• Transient Crossing of Phantom divide line $w_{\Lambda }=-1$ under Gauss-Bonnet interaction
• LRS Bianchi I model with constant expansion rate in $f(R,T)$ gravity
• Networks of cosmological histories, crossing of the phantom divide line and potentials with cusps
• Dark energy and supermassive black holes
• Massive scalar field quasinormal modes of a Schwarzschild black hole surrounded by quintessence
• Spherical collapse model in agegraphic dark energy cosmologies
• Phantom universe from CPT symmetric QFT
• f(T) cosmology against the cosmographic method: A new study using mock and observational data
• Cosmic Acceleration in Brans-Dicke Cosmology
• Structure formation in dark energy cosmologies described by PADE parameterization
• Linear and non-linear perturbations in dark energy models
• Constraining H0 in General Dark Energy Models from Sunyaev-Zeldovich/X-ray Technique and Complementary Probes
• Wormhole solutions in the presence of nonlinear Maxwell field
• Current lookback time-redshift bounds on dark energy
• Phantom Accretion by Black Holes and the Generalized Second Law of Thermodynamics
• Observational constraints on the time-dependence of dark energy
• Modified holographic Ricci dark energy coupled to interacting relativistic and non-relativistic dark matter in the nonflat universe
• Comments on Scalar-Tensor Representation of $f(R)$ Theories
• LRS Bianchi I model with constant deceleration parameter
• Higher Dimensional Cosmological Implications Of A Decay Law For $\Lambda$ Term : Expressions For Some Observable Quantities
• Scalar field description of a parametric model of dark energy
• "Expansion" around the vacuum: how far can we go from Lambda?
• Structure formation in clustering DBI dark energy model with constant sound speed
• Constraining $f(R)$ Theories with Temporal Variation of Fine Structure Constant
• The growth of DM and DE perturbations in DBI non-canonical scalar field scenario
• Crossing of the Cosmological Constant Boundary - an Equation of State Description
• Cosmological Parameters and Cosmic Topology
• Constraining Dynamical Dark Energy Models through the Abundance of High-Redshift Supermassive Black Holes
• Dynamical Oscillations in Dark Energy: Joint Constraints on the $w_{sin}$CDM Model from DESI, OHD, and Supernova Samples
• Analytical considerations about the cosmological constant and dark energy
• The Fourth Gravity Test and Quintessence Matter Field
• Structure formation in a non-canonical scalar field model of clustering dark energy
• Axion boson stars with wormhole topology