Constraints on coupled dark energy using CMB data from WMAP and South Pole Telescope

We consider the case of a coupling in the dark cosmological sector, where a dark energy scalar field modifies the gravitational attraction between dark matter particles. We find that the strength of the coupling [Beta] is constrained using current Cosmic Microwave Background data, including WMAP7 an...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2012-11, Vol.86 (10), Article 103507
Main Authors: Pettorino, Valeria, Amendola, Luca, Baccigalupi, Carlo, Quercellini, Claudia
Format: Article
Language:English
Subjects:
Confidence intervals
Cosmic microwave background
Cosmology
Dark energy
Gravitation
Hubble Space Telescope
Joining
South Pole
Telescopes
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Summary:We consider the case of a coupling in the dark cosmological sector, where a dark energy scalar field modifies the gravitational attraction between dark matter particles. We find that the strength of the coupling [Beta] is constrained using current Cosmic Microwave Background data, including WMAP7 and the South Pole Telescope (SPT), to be less than 0.063 (0.11) at a 68% (95%) confidence level. In this case, we also find an interesting likelihood peak for [Beta] = 0.041. This peak comes mostly from a slight difference between the Hubble parameter measured by the Hubble Space Telescope and the WMAP7 + SPT best fit. Finally, we show that forecasts of Planck + SPT mock data can pin down the coupling to a precision of better than 1% and detect whether the marginal peak we find at small nonzero coupling is a real effect.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.86.103507