Probing Gravitation, Dark Energy, and Acceleration

Abstract

The acceleration of the expansion of the universe arises from unknown physical processes involving either new fields in high energy physics or modifications of gravitation theory. It is crucial for our understanding to characterize the properties of the dark energy or gravity through cosmological observations and compare and distinguish between them. In fact, close consistencies exist between a dark energy equation of state function w(z) and changes to the framework of the Friedmann cosmological equations as well as direct spacetime geometry quantities involving the acceleration, such as ``geometric dark energy'' from the Ricci scalar. We investigate these interrelationships, including for the case of superacceleration or phantom energy where the fate of the universe may be more gentle than the Big Rip.

12 pages, 8 figures

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Cited by in corpus (104)

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• The Dynamics of Quintessence, The Quintessence of Dynamics
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• The Hubble series: Convergence properties and redshift variables
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• Possible signals of vacuum dynamics in the Universe
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• Observational constraints on viable f(R) parametrizations with geometrical and dynamical probes
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• Redshift space correlations and scale-dependent stochastic biasing of density peaks
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• New Cosmic Accelerating Scenario without Dark Energy
• Bayesian analysis of $f(T)$ gravity using $f{\sigma }_8$ data
• Constraints and analytical solutions of $f(R)$ theories of gravity using Noether symmetries
• Dynamical dark energy or variable cosmological parameters?
• Internal space structure generalization of the quintom cosmological scenario
• Two scalar field cosmology: Conservation laws and exact solutions
• Dynamical dark energy: scalar fields and running vacuum
• Hint for Quintessence-like Scalars from Holographic Dark Energy
• Generalized second law in modified theory of gravity
• SO(1,1) dark energy model and the universe transition
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• Confronting Dark Energy Models using Galaxy Cluster Number Counts
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• Curved Space or Curved Vacuum?
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• Quantifying the evidence for the current speed-up of the Universe with low and intermediate-redshift data. A more model-independent approach
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• Constraints on Neutrino Mass and Light Degrees of Freedom in Extended Cosmological Parameter Spaces
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• Reconstructing and Deconstructing Dark Energy
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• Mass-Varying Neutrinos from a Variable Cosmological Constant
• Probing Cosmic Acceleration by Using the SNLS3 SNIa Dataset
• Growth Rate in the Dynamical Dark Energy Models
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• Cosmology with variable parameters and effective equation of state for Dark Energy
• Cosmological constrains on minimally and non-minimally coupled scalar field models
• On tidal forces in f(R) theories of gravity
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• Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies
• Uncertainty on determining the dark energy equation of state due to the spatial curvature
• Exploring the Growth Index ${\gamma }_L$: Insights from Different CMB Dataset Combinations and Approaches
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• Can Strong Gravitational Lensing Constrain Dark Energy?
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• Quinstant Dark Energy Predictions for Structure Formation
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