Measuring the Speed of Sound of Quintessence

Details Measuring the Speed of Sound of Quintessence Measuring the Speed of Sound of Quintessence

2001-12-19

arxiv.org/abs/astro-ph/0112438v1

Phys.Rev.Lett.88:121301,2002

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.121301

Quintessence, a time-varying energy component that may account for the accelerated expansion of the universe, can be characterized by its equation of state and sound speed. In this paper, we show that if the quintessence density is at least one percent of the critical density at the surface of last scattering the cosmic microwave background anisotropy can distinguish between models whose sound speed is near the speed of light versus near zero, which could be useful in distinguishing competing candidates for dark energy.

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