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Extreme-Value Statistics for Testing Dark Energy

Published online by Cambridge University Press:  01 July 2015

Simone Aiola ,
Arthur Kosowsky  and
Bingjie Wang
Simone Aiola*
Affiliation:
Department of Physics and Astronomy & Pitt-PACC, University of Pittsburgh, PA 15260
Arthur Kosowsky
Affiliation:
Department of Physics and Astronomy & Pitt-PACC, University of Pittsburgh, PA 15260
Bingjie Wang
Affiliation:
Department of Physics and Astronomy & Pitt-PACC, University of Pittsburgh, PA 15260
*
1email: [email protected]
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Abstract

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The integrated Sachs-Wolfe effect was recently detected at a level of 4.4σ by [Granett et al. (2008)], by stacking compensated CMB temperature patches corresponding to superstructures in the universe. We test the reported signal using realistic gaussian random realizations of the CMB sky, based on the temperature power spectrum predicted by the concordance ΛCDM model. Such simulations provide a complementary approach to the largely used N-body simulations and allow to include the contaminant effects due to small-scale temperature fluctuations. We also apply our pipeline to foreground-cleaned CMB sky maps using the [Granett et al. (2008)] voids/clusters catalog. We confirm the detection of a signal, which depart from the null hypothesis by 3.5σ, and we report a tension with our theoretical estimates at a significance of about 2.5σ.

Keywords

cosmic microwave backgroundlarge-scale structure of universemethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 54 - 56
Copyright
Copyright © International Astronomical Union 2015 

References

Aiola, S., Kosowsky, A., & Wang, B. 2014, in preparationGoogle Scholar
Flender, S., Hotchkiss, S., & Nadathur, S. 2013, JCAP 2 013, 13Google Scholar
Granett, B. R., Neyrinck, M. C., & Szapudi, I. 2008, ApJ (Letters), 683, L99Google Scholar
Planck Collaboration 2013, arXiv:1303.5079Google Scholar
Sachs, R. K. & Wolfe, A. M. 1967, ApJ, 147, 73Google Scholar