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The impact of superstructures in the Cosmic Microwave Background

Published online by Cambridge University Press:  01 July 2015

Stéphane Ilić ,
Mathieu Langer  and
Marian Douspis
Stéphane Ilić
Affiliation:
Institut de Recherche en Astrophysique et Planétologie, 14 avenue Édouard Belin, 31400 Toulouse, France email: stephane.ilic@irap.omp.eu
Mathieu Langer
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud, Bâtiment 121, 91405 Orsay Cedex, France emails: mathieu.langer@ias.u-psud.fr, marian.douspis@ias.u-psud.fr
Marian Douspis
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud, Bâtiment 121, 91405 Orsay Cedex, France emails: mathieu.langer@ias.u-psud.fr, marian.douspis@ias.u-psud.fr
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Abstract

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In 2008, Granett et al. claimed a direct detection of the integrated Sachs- Wolfe (iSW) effect by a stacking approach of patches of the CMB, at the positions of identified superstructures. However, the high amplitude of their measured signal seems to be at odds with predictions from the standard model of cosmology. However, multiple questions arise from these results and their expected value : I propose here an original theoretical prediction of the iSW effect produced by such superstructures. I use simulations based on GR and the LTB metric to reproduce cosmic structures and predict their exact full theoretical iSW effect. Expected amplitudes are consistent with the measured signal ; however the latter shows non-reproducible features that are hardly compatible with ΛCDM predictions.

Keywords

cosmic microwave backgroundlarge-scale structure of universedark energygeneral relativity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 162 - 164
Copyright
Copyright © International Astronomical Union 2015 

References

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Granett, B. R., Neyrinck, M. C., & Szapudi, I. 2008, ApJ 683 L99–L102Google Scholar
Ilić, S., Langer, M., & Douspis, M. 2013, A&A, 556, A51Google Scholar