Constraining Early Dark Energy with Current and Future CMB Data

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• Erminia Calabrese (University of Rome)
• Tuesday 23 November 2010, 16:30-17:30
• Martin Ryle Seminar Room, Kavli Building.

If you have a question about this talk, please contact David Titterington.

One propery of a popular class of dark energy models is the tracking behaviour of the dominant energy component so that the dark energy density will sub-dominantly track the evolution of the dominant component and can be never negligible with respect to radiation and matter. Dark energy could therefore be present not only in the late universe but also in early times as suggested by several models of “early” dark energy (EDE). In this talk I will discuss the future constraints on EDE parameters achievable by the Planck and CMB Pol experiments considering the possibility of EDE clustering through a sound speed < 1 (cold dark energy) and the presence of anisotropic stresses. In particular I will show how a detection of the lensing signal of the CMB can significantly improve the constraints on EDE . Finally I will discuss how the recent indications (at one confidence level) for an extra background of relativistic particles can be partially explained by EDE .

This talk is part of the Cavendish Astrophysics Seminars series.

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