Is the integrated Sachs-Wolfe effect from super-structures still a problem for LambdaCDM?

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• Shaun Hotchkiss (University of Helsinki)
• Monday 27 February 2012, 13:00-14:00
• CMS, Pav.B, CTC Common Room (B1.19).

If you have a question about this talk, please contact Dr Sebastien Renaux-Petel.

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.

This talk is part of the Cosmology Lunch series.

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