Hostname: page-component-745bb68f8f-lrblm Total loading time: 0 Render date: 2025-01-26T12:43:42.317Z Has data issue: false hasContentIssue false
  • English
  • Français

The impact of superstructures in the Cosmic Microwave Background

Published online by Cambridge University Press:  12 October 2016

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 Institut d'Astrophysique Spatiale, Université Paris-Sud, UMR8617, Orsay, F-91405 & CNRS, Orsay, F-91405 emails: mathieu.langer@ias.u-psud.fr, marian.douspis@ias.u-psud.fr
Mathieu Langer
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud, UMR8617, Orsay, F-91405 & CNRS, Orsay, F-91405 emails: mathieu.langer@ias.u-psud.fr, marian.douspis@ias.u-psud.fr
Marian Douspis
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud, UMR8617, Orsay, F-91405 & CNRS, Orsay, F-91405 emails: mathieu.langer@ias.u-psud.fr, marian.douspis@ias.u-psud.fr
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In 2008, Granett et al. claimed a direct detection of the integrated Sachs-Wolfe (iSW) effect, through the stacking of CMB patches at the positions of identified superstructures. Additionally, the high amplitude of their measured signal was reported to be at odds with predictions from the standard model of cosmology. However, a closer inspection of these results prompts multiple questions, more specifically about the amplitude and significance of the expected signal. We propose here an original theoretical prediction of the iSW effect produced by such superstructures. We use simulations based on GR and the LTB metric to reproduce cosmic structures and predict their exact theoretical iSW effect on the CMB. The amplitudes predicted with this method are consistent with the signal measured when properly accounting the contribution of the non-negligible (and fortuitous) primordial CMB fluctuations to the total signal. It also highlights the tricky nature of stacking measurements and their interpretation.

Keywords

cosmic microwave backgroundlarge-scale structure of universedark energy
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 623 - 625
Copyright
Copyright © International Astronomical Union 2016 

References

Cai, Yan-Chuan, Neyrinck, Mark C. & Szapudi, , István, , Cole, , Shaun, , Frenk, , & Carlos, S. 2014, ApJ, 786, 110 CrossRefGoogle Scholar
Douspis, M., Castro, P. G., Caprini, C. & Aghanim, N. 2008, A&A 485 395–401 Google Scholar
Dupé, F.-X., Rassat, A., Starck, J.-L., & Fadili, M. J. 2011, A&A, 534, A51 Google Scholar
Granett, Benjamin R., Neyrinck, Mark C., & Szapudi, István 2008, ApJ 683 L99–L102 CrossRefGoogle Scholar
Ilić, Stéphane, Langer, Mathieu, & Douspis, Marian 2013, A&A, 556, A51 Google Scholar
Kofman, L. A. & Starobinskii, A. A. 1985, Sv. A. L. 11 271–274 Google Scholar