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Constraints on the Sound Speed of Dynamical Dark Energy

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arxiv astro-ph/0703202 v2 pith:NK34GMTY submitted 2007-03-09 astro-ph hep-phhep-th

Jun-Qing Xia , Yi-Fu Cai , Tao-Tao Qiu , Gong-Bo Zhao , Xinmin Zhang This is my paper · ORCID
classification astro-phhep-phhep-th
keywords darkenergysoundspeeddynamicalanalysisangularanisotropy
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

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

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 106 citations worldwide. Full citation record

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