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SUMMARY:Studying the Cosmic Large-Scale Structure and Testing Cosmological
  Models with X-ray Galaxy Clusters - Hans Böhringer (MPI fuer Extraterres
 trische Physik\, Garching\, Germany)
DTSTART:20151103T140000Z
DTEND:20151103T150000Z
UID:TALK61728@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:We use a large\, statistically very well characterised X-ray f
 lux-limited sample of galaxy clusters to study the large-scale structure o
 f the Universe out to redshifts of ~0.4. Testing cosmological models by me
 ans of the cluster X-ray luminosity function we obtain tight constraints o
 n the matter density and amplitude parameter of the density fluctuation po
 wer spectrum.  We find some tension in the resulting density fluctuation a
 mplitude with the prediction from the Planck results in the frame of the s
 tandard Lambda-CDM cosmological model.  The tension implies a less pronoun
 ced fluctuation amplitude of nearby large-scale structure a compared to th
 e predictions.  The results can be reconciled\, however\, by for example i
 ntroducing massive neutrinos.\n\nWe also use the cluster sample to study s
 uperclusters and the matter distribution in the local Universe.  One of th
 e findings of this research is a locally underdense region in the Southern
  Galactic Cap region\, with interesting consequences for local measurement
 s of cosmological parameters\, like the Hubble constant.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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