Supernova Limits on the Cosmic Equation of State

Abstract

We use Type Ia supernovae studied by the High-Z Supernova Search Team to constrain the properties of an energy component which may have contributed to accelerating the cosmic expansion. We find that for a flat geometry the equation of state parameter for the unknown component, alpha_x=P_x/rho_x, must be less than -0.55 (95% confidence) for any value of Omega_m and is further limited to alpha_x<-0.60 (95%) if Omega_m is assumed to be greater than 0.1 . These values are inconsistent with the unknown component being topological defects such as domain walls, strings, or textures. The supernova data are consistent with a cosmological constant (alpha_x=-1) or a scalar field which has had, on average, an equation of state parameter similar to the cosmological constant value of -1 over the redshift range of z=1 to the present. Supernova and cosmic microwave background observations give complementary constraints on the densities of matter and the unknown component. If only matter and vacuum energy are considered, then the current combined data sets provide direct evidence for a spatially flat Universe with Omega_tot=Omega_m+Omega_Lambda = 0.94 +/- 0.26 (1-sigma).

Accepted for publication in ApJ, 3 figures

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• On the problem of equation of state for the $\Lambda$ - field
• Closed universe and the first Doppler-peak of the CMB spectrum
• Quintessence dissipative superattractor cosmology
• Monopole gravitational waves from relativistic fireballs driving gamma-ray bursts
• Transit cosmological models coupled with zero-mass scalar-field with high redshift in higher derivative theory
• Quintessence with a localized scalar field on the brane
• Stress testing the dark energy equation of state imprint on supernova data
• Higher Dimensional Cosmological Implications Of A Decay Law For $\Lambda$ Term : Expressions For Some Observable Quantities
• Lower Limit to the Scale of an Effective Theory of Gravitation
• Quintessence and Brane world scenarios
• Acceptable Inverse Power Law Potential Quintessence with n=18/7
• Curvature of the universe and the dark energy potential
• A minimal set of invariants as a systematic approach to higher order gravity models: Physical and Cosmological Constraints
• Dynamics of Logamediate and Intermediate Scenarios in the Dark Energy Filled Universe
• On the electrodynamics of moving particles in a quasi flat spacetime with Lorentz violation and its cosmological implications
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• The issue of Dark Energy in String Theory
• Destiny: A Candidate Architecture for the Joint Dark Energy Mission
• Multicomponent solution in modified theory of gravity in the early universe
• Stability of Circular Orbits in General Relativity: A Phase Space Analysis
• Dynamical Behavior of dilaton in de Sitter space
• Absence of "Ghost Images" Excludes Large Values of the Cosmological Constant
• New Tsallis holographic dark energy with apparent horizon as IR-cutoff in non-flat Universe
• A brief review of a modified relativity that explains cosmological constant
• The variation of the electromagnetic coupling and quintessence
• Reduced convergence and the local smoothness parameter: bridging two different descriptions of weak lensing amplification
• Role of a periodic varying deceleration parameter in Particle creation with higher dimensional FLRW Universe
• Implications to CMB from Model Independent evolution of w and Late Time Phase Transition
• Varying Speed of Light, Modified Chaplygin Gas and Accelerating Universe
• Decay of charged fields in de Sitter spacetime
• Bounds on the Mass and Coupling Constant of Radion in the Randall-Sundrum Theory
• A critical-density closed Universe in Brans-Dicke theory
• Relic gravitational waves and present accelerated expansion
• Parameters and pitfalls in dark energy models with time varying equation of state
• de Sitter field equations from quadratic curvature gravity: A group theoretical approach
• Five-Dimrnsional Cosmological Theory of Unified Space, Time and Velocity
• Cosmic Shells
• The Dynamic Behavior of Quantum Statistical Entropy in 5D Ricci-flat Black String with Thin-layer Approach
• A Note on the Positive Constant Curvature Space
• Observational constraints on a Yang-Mills condensate dark energy model
• Accelerated closed universes in scalar-tensor theories
• Distance measurements as a probe of cosmic acceleration
• Indirect detection of Cosmological Constant from interacting open quantum system
• A new global 1-form in Lyra geometric cosmos model
• Development of the Universe and New Cosmology
• Spintessence: a possible candidate as a driver of the late time cosmic acceleration
• The ${\Omega }_{DE}-{\Omega }_M$ Plane in Dark Energy Cosmology
• Spin Interaction under the Collision of Two Kerr-(anti-)de Sitter Black Holes
• Mini Black Holes and the Relic Gravitational Waves Spectrum
• The expansion of the universe observed with supernovae
• Implications upon theory discrimination of an accurate measurement of the time rate of change of the gravitational parameter and other cosmological parameters
• LSP as a Candidate for Dark Matter
• The electromagnetic coupling and the dark side of the Universe
• Can MONDian vector theories explain the cosmic speed up ?
• Testing the CMB Data for Systematic Effects
• Relativity of spatial scale and of the Hubble flow: The logical foundations of relativity and cosmology
• Constraining Violations of the Weak Equivalence Principle in the Dark Sector
• The Self-Calibrating Hubble Diagram
• Late time acceleration in 3-brane Brans-Dicke cosmology
• Phenomenological aspects of dark energy dominated cosmologies
• Colliders and Cosmology
• New Classes of Cosmic Energy and Primordial Black-Hole Formation
• Thermodynamics and Quasinormal modes of Park black hole in Hořava gravity
• Cosmology with dark energy decaying through its chemical-potential contribution
• Probing Time-Dependent Dark Energy with the Flux Power Spectrum of the Lyman $\alpha$ Forest
• Unruh effect as foundation of universal gravitation within the cosmological scenario
• Role of Chameleon Field in presence of Variable Modified Chaplygin gas in Brans-Dicke Theory
• Accelerating Flat Universe and Analytic Study of the m-z Relation
• An accelerated closed universe
• dS/CFT correspondence from the Brick Wall method
• String Cosmology in LRS Bianchi Type-II Dusty Universe with Time Decaying Vacuum Energy Density $\Lambda$
• Late time cosmological solutions in $f(R,T)$ gravity in a viscous Universe
• Improvement of a provisional solution of the quantum-corrected field equations of d = 11 supergravity on flat R^4 times a compact hyperbolic 7-manifold, and modes that decay along the beam line outside the interaction region at the LHC
• Differences between scalar field and scalar density solutions
• A Topological Extension of General Relativity to Explore the Nature of Quantum Space-time, Dark Energy and Inflation
• A causal model for a closed universe
• Shadows and photon spheres of static black holes embedded in a Dehnen-(1,4,5/2)-type dark matter halo with a quintessential field
• How Dark is Dark Energy? A Lightcones Comparison Approach
• Background gravitational waves as signature of the adiabatic expansion of a black body that represents the dark universe
• Design and performance of a Collimated Beam Projector for telescope transmission measurement using a broadband light source