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Monday 27 February 2012, 13:00-14:00
Is the integrated Sachs-Wolfe effect from super-structures still a problem for LambdaCDM?
- đ¤ Speaker: Shaun Hotchkiss (University of Helsinki)
- đ Date & Time: Monday 27 February 2012, 13:00 - 14:00
- đ Venue: CMS, Pav.B, CTC Common Room (B1.19)
Abstract
In any region of the universe where the gravitational potential decays over time large-scale structure will produce a redshift in the cosmic microwave background. This is known as the integrated Sachs-Wolfe (ISW) effect. A cosmological constant causes such a decay and as such the ISW effect is an important consistency test of the standard cosmological model. The ISW imprint of very large (super) structures has reportedly been detected with >4\sigma significance. I will discuss this observation and the LambdaCDM prediction for it. It is seen that the observed signal is >3-sigma larger than expectations. No solution to this ‘ISW mystery’ is yet known; however I will discuss some interesting directions worth further exploration.
Series This talk is part of the Cosmology Lunch series.
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