Constraints on the dark matter sound speed from galactic scales: The cases of the modified and extended Chaplygin gas

doi:10.1103/PhysRevD.91.083508

Paper

Constraints on the dark matter sound speed from galactic scales: The cases of the modified and extended Chaplygin gas

Published Feb 26, 2015 · V. M. C. Ferreira, P. Avelino

Physical Review D

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Abstract

We show that the observed rotation curves of spiral galaxies constrain the sound speed of the dark matter to be $c_s < 10^{-4} c$, where $c$ is the speed of light in vacuum. Using the Modified Chaplygin Gas as a representative example of a class of unified dark energy models incorporating an effective dark matter component with a non-zero sound speed, we determine the most stringent constraint to date on the value of the constant contribution to the equation of state parameter in this class of models. Finally, we explain the reason why previous constraints using the Cosmic Microwave Background and Baryonic Acoustic Oscillations were not as competitive as the one presented in this paper and discuss the limitations of the recently proposed Extended Chaplygin Gas.

Study Snapshot

The observed rotation curves of spiral galaxies constrain the sound speed of dark matter to be $c_s 10-4 c$, providing the most stringent constraint on the constant contribution to the equation of state parameter in unified dark energy models.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Constraints on the dark matter sound speed from galactic scales: The cases of the modified and extended Chaplygin gas

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