CONSTRAINTS ON THE SOUND SPEED OF DYNAMICAL DARK ENERGY

doi:10.1142/S0218271808012784

Paper

CONSTRAINTS ON THE SOUND SPEED OF DYNAMICAL DARK ENERGY

Published Mar 9, 2007 · Gong-Bo Zhao, Yi Cai, T. Qiu

International Journal of Modern Physics D

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Abstract

In this paper we study in detail the sound speed — $c_s^2$, which is directly related to the classical perturbations — of dynamical dark energy (DE). We consider especially the case with an equation of state crossing the cosmological constant boundary, and show its implications for cosmic microwave background (CMB) anisotropy. With the present observational data on the CMB, the Type Ia supernova (SNIa) and galaxy clustering, we perform a global analysis to constrain the sound speed of DE, using the Markov chain Monte Carlo method. We find that the sound speed of DE is weakly constrained by current observations, and thus futuristic precision measurements of the CMB on a very large angular scale (low multipoles) are necessary.

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Study Snapshot

The sound speed of dynamical dark energy is weakly constrained by current observations, requiring future precision measurements of the cosmic microwave background on a large angular scale.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

CONSTRAINTS ON THE SOUND SPEED OF DYNAMICAL DARK ENERGY

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