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Characteristic angular scales in cosmic microwave background radiation

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type 10 Nov 2006Embargo end date: 01 Jan 2003 United Kingdom Publisher:IOP PublishingJournal:Journal of Statistical Mechanics: Theory and Experiment, volume 2,006, pages P11008-P11008 (eissn: 1742-5468,

Authors: Katepalli R. Sreenivasan; M. Sadegh Movahed; M. Reza Rahimi Tabar; M. Reza Rahimi Tabar; F. Ghasemi; Sohrab Rahvar; A. Bahraminasab;

doi: 10.1088/1742-5468/2006/11/p11008 , 10.48550/arxiv.astro-ph/0312227

arXiv: http://arxiv.org/abs/astro-ph/0312227

Characteristic angular scales in cosmic microwave background radiation

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Abstract

We investigate the stochasticity in temperature fluctuations in the cosmic microwave background (CMB) radiation data from {\it Wilkinson Microwave Anisotropy Probe}. We show that the angular fluctuations of the temperature is a Markov process with a {\it Markov angular scale}, $��_{\rm Markov}=1.01^{+0.09}_{-0.07}$. We characterize the complexity of the CMB fluctuations by means of a Fokker-Planck or Langevin equation and measure the associated Kramers-Moyal coefficients for the fluctuating temperature field $T(\hat n)$ and its increment, $��T =T(\hat n_1) - T(\hat n_2)$. Through this method we show that temperature fluctuations in the CMB has fat tails compared to a Gaussian distribution.

10 pages, 8 figures Accepted in J. Stat. Mech

Country

United Kingdom

Related Organizations

The Abdus Salam International Centre for Theoretical Physics (ICTP)
Italy
Centre national de la recherche scientifique
France
Research Institute for Astronomy and Astrophysics of Maragh
Iran (Islamic Republic of)
Max Planck Society
Germany
Sharif University of Technology
Iran (Islamic Republic of)

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Keywords

High Energy Physics - Theory, Statistical Mechanics (cond-mat.stat-mech), Astrophysics (astro-ph), 500, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, 530, General Relativity and Quantum Cosmology, High Energy Physics - Theory (hep-th), Physics - Data Analysis, Statistics and Probability, Condensed Matter - Statistical Mechanics, Data Analysis, Statistics and Probability (physics.data-an)

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NEANIAS Space Research Community