Is cosmic acceleration slowing down?

Abstract

We investigate the course of cosmic expansion in its `recent past' using the Constitution SN Ia sample (which includes CfA data at low redshifts), jointly with signatures of baryon acoustic oscillations (BAO) in the galaxy distribution and fluctuations in the cosmic microwave background (CMB). Earlier SN Ia data sets could not address this issue because of a paucity of data at low redshifts. Allowing the equation of state of dark energy (DE) to vary, we find that a coasting model of the universe (q_0=0) fits the data about as well as LCDM. This effect, which is most clearly seen using the recently introduced `Om' diagnostic, corresponds to an increase of Om(z) and q(z) at redshifts z \lleq 0.3. In geometrical terms, this suggests that cosmic acceleration may have already peaked and that we are currently witnessing its slowing down. The case for evolving DE strengthens if a subsample of the Constitution set consisting of SNLS+ESSENCE+CfA SN Ia data is analysed in combination with BAO+CMB using the same statistical methods. The effect we observe could correspond to DE decaying into dark matter (or something else). A toy model which mimics this process agrees well with the combined SN Ia+BAO+CMB data.

6 pages, 5 figures, presentation expanded, results for a new subsample of the Constitution set are added, new BAO data are accounted for, main results unchanged

References in corpus (10)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Dark Energy and the Accelerating Universe
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Reconstructing Dark Energy
• Two new diagnostics of dark energy
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• A litmus test for Lambda
• Bright High z SnIa: A Challenge for LCDM?

Cited by in corpus (138)

• Dark Energy
• Cosmological Evolution With Interaction Between Dark Energy And Dark Matter
• A Simple Phenomenological Emergent Dark Energy Model can Resolve the Hubble Tension
• Cosmology with the lights off: Standard sirens in the Einstein Telescope era
• Probing the anisotropic local universe and beyond with SNe Ia data
• DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
• Model independent tests of the standard cosmological model
• An improved model-independent assessment of the late-time cosmic expansion
• Average observational quantities in the timescape cosmology
• Three thermodynamically-based parametrizations of the deceleration parameter
• Backreaction: directions of progress
• Implications of a transition in the dark energy equation of state for the $H_0$ and ${\sigma }_8$ tensions
• High-Redshift Cosmography
• Examining the cosmic acceleration with the latest Union2 supernova data
• $Om$ diagnostic applied to scalar field models and slowing down of cosmic acceleration
• The Statefinder hierarchy: An extended null diagnostic for concordance cosmology
• A model independent null test on the cosmological constant
• Cosmic slowing down of acceleration for several dark energy parametrizations
• Test of the cosmic evolution using Gaussian processes
• Reconstruction and constraining of the jerk parameter from OHD and SNe Ia observations
• Reconstruction of the Dark Energy equation of state
• Hubble parameter data constraints on dark energy
• Post-Newtonian parameters gamma and beta of scalar-tensor gravity with a general potential
• Could the cosmic acceleration be transient? A cosmographic evaluation
• Cosmological consequences of a possible $\Lambda$-dark matter interaction
• Holographic dark energy in a universe with spatial curvature and massive neutrinos: a full Markov Chain Monte Carlo exploration
• Peculiar motions, accelerated expansion and the cosmological axis
• High redshift cosmography: new results and implication for dark energy
• New holographic reconstruction of scalar field dark energy models in the framework of chameleon Brans-Dicke cosmology
• Transient cosmic acceleration from interacting fluids
• Oscillations in the dark energy EoS: new MCMC lessons
• What do we know about cosmography
• Crossing Statistic: Reconstructing the Expansion History of the Universe
• The transient acceleration from time-dependent interacting dark energy models
• Effects of time-varying $\beta$ in SNLS3 on constraining interacting dark energy models
• Exploring the Systematic Uncertainties of Type Ia Supernovae as Cosmological Probes
• Constraints on dark energy from the lookback time versus redshift test
• Rendering Dark Energy Void
• Scalar models for the generalized Chaplygin gas and the structure formation constraints
• Cosmological Hysteresis and the Cyclic Universe
• f(R) Gravity and its Cosmological Implications
• Comparison of Recent SnIa datasets
• Effects of inhomogeneities on apparent cosmological observables: "fake" evolving dark energy
• Revisiting the holographic dark energy in a non-flat universe: alternative model and cosmological parameter constraints
• Stellar and dark matter density in the Local Universe
• Probing Dark Energy Dynamics from Current and Future Cosmological Observations
• Post-Planck Dark Energy Constraints
• A comprehensive investigation on the slowing down of cosmic acceleration
• Dark energy by natural evolution: Constraining dark energy using Approximate Bayesian Computation
• Crossing Statistic: Bayesian interpretation, model selection and resolving dark energy parametrization problem
• Uncertainty on w from large-scale structure
• Distance Measurements from Supernovae and Dark Energy Constraints
• Non-minimal Derivative Coupling Scalar Field and Bulk Viscous Dark Energy
• Thermodynamics of the Variable Modified Chaplygin gas
• Detecting the cosmic acceleration with current data
• Revisit of constraints on holographic dark energy: SNLS3 dataset with the effects of time-varying $\beta$ and different light-curve fitters
• A divergence-free parametrization for dynamical dark energy
• Violation of the FRW consistency condition as a signature of backreaction
• Galaxy cluster angular size data constraints on dark energy
• Scalar-tensor cosmologies with a potential in the general relativity limit: time evolution
• Exploring the evolution of color-luminosity parameter $\beta$ and its effects on parameter estimation
• Cosmic slowing down of acceleration using $f_{gas}$
• Can phantom transition at $z\sim 1$ restore the Cosmic concordance?
• Probing Cosmic Acceleration by Using the SNLS3 SNIa Dataset
• Reconstructing the History of Energy Condition Violation from Observational Data
• Accelerating models with a hybrid scale factor in extended gravity
• Exploring hints for dark energy density evolution in light of recent data
• Testing cosmic acceleration for $w(z)$ parameterizations using $f_{gas}$ measurements in galaxy clusters
• Intrinsic uncertainty on the nature of dark energy
• {\it Gauging} the cosmic acceleration with recent type Ia supernovae data sets
• Cosmological acceleration
• Cosmological foundations revisited with Pantheon+
• Effective equation of state in modified gravity and observational constraints
• Tension between SN and BAO: current status and future forecasts
• Seeking Evolution of Dark Energy
• Cosmological aspects of $f(R,T)$ gravity in a simple model with a parametrization of $q$
• Limits on the parameters of the equation of state for interacting dark energy
• Scalar-tensor cosmologies with dust matter in the general relativity limit
• Perturbations for transient acceleration
• The effect of different observational data on the constraints of cosmological parameters
• An exponential equation of state of dark energy in the light of 2018 CMB Planck data
• Asymmetry in the reconstructed deceleration parameter
• Spherically symmetric inhomogeneous model with Chaplygin gas
• On the effect of the degeneracy between w_0 and w_a
• Unexplored regions in teleparallel $f(T)$ gravity: Sign-changing dark energy density
• A new parametrization of dark energy equation of state leading to double exponential potential
• The role of curvature in the slowing down acceleration scenario
• Improved cosmological constraints on the curvature and equation of state of dark energy
• The complementarity of the redshift drift
• Effects of a time-varying color-luminosity parameter $\beta$ on the cosmological constraints of modified gravity models
• A new parametrization for dark energy density and future deceleration
• The tension on the cosmological parameters from different observational data
• Cosmological Consequences of Exponential Gravity in Palatini Formalism
• Expanding Universe: slowdown or speedup?
• Probing the course of cosmic expansion with a combination of observational data
• Transient acceleration in $f(T)$ gravity
• Probing Dark Energy with the Kunlun Dark Universe Survey Telescope
• ISW effect as probe of features in the expansion history of the Universe
• Discriminating different models of luminosity-redshift distribution
• Localization of the SFT inspired Nonlocal Linear Models and Exact Solutions
• Revisiting cosmic acceleration with DESI BAO
• Constraints On Dark Energy Models From Galaxy Clusters and Gravitational Lensing Data
• Scaling cosmology with variable dark-energy equation of state
• Physical condition for the slowing down of cosmic acceleration
• Interacting agegraphic dark energy models in phase space
• Current cosmological constraints on the curvature, dark energy and modified gravity
• Inhomogeneities in dusty universe - a possible alternative to dark energy?
• A primer on problems and prospects of dark energy
• Constraining Modified Chaplygin gas parameters
• Posing Constraints on the Free Parameters of a New Model of Dark Energy EoS : Responses Through Cosmological Behaviours
• Falsifying Cosmological Constant
• Cosmological implications of different baryon acoustic oscillation data
• Re-examining the role of curvature in the slowing down acceleration scenario
• Observational constraint on dynamical evolution of dark energy
• Interactions in the dark sector of the Universe
• Interacting dark energy models in fractal cosmology
• Transient Accelerating Scalar Models with Exponential Potential
• Probing the cosmic acceleration from combinations of different data sets
• Do current observations support transient acceleration of our universe?
• Analysis of recent type Ia supernova data based on evolving dark energy models
• Dynamical evolution of quintessence cosmology in a physical phase space
• Studying light propagation in a locally homogeneous universe through an extended Dyer-Roeder approach
• Generalized particle dynamics in anti de Sitter spaces: A source for dark energy
• On Semi-classical Degravitation and the Cosmological Constant Problems
• Constraints on dark energy evolution
• Averaging in cosmological models
• Bayesian model-independent evaluation of expansion rates of the universe
• Observational constraints on models of the Universe with time variable Gravitational and Cosmological constants along MOG
• Model of a multiverse providing the dark energy of our universe
• A class of transient acceleration models consistent with Big Bang Cosmology
• The Stability Analysis of Brane Induced Gravity with Quintessence Field on the Brane with a Gaussian Potential
• A Thousand Problems in Cosmology: Interaction in the Dark Sector
• Delineating cosmic expansion history with recent supernova data: A Bayesian model-independent approach
• Comparative Study of $f(T)$ Gravity Models with Observational Constraints from \textit{OHD} and \textit{Pantheon+ datasets}
• A Lemaitre-Tolman-Friedmann Universe without Dark Energy
• Supernova constraints on higher-dimensional cosmology with a phantom field
• Emergent Universe Scenario in the Modified Chaplygin gas : Towards an Exact Solution and Observational Constraints
• Lookback time and Chandra constrains on cosmological parameters