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Characteristic angular scales in cosmic microwave background radiation

Ghasemi, F. and Bahraminasab, A. and Sadegh Movahed, M. and Rahvar, S. and Sreenivasan, K. R. and Reza Rahimi Tabar, M. (2006) Characteristic angular scales in cosmic microwave background radiation. Journal of Statistical Mechanics: Theory and Experiment (P11008).

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Abstract

We investigate the stochasticity in temperature fluctuations in the cosmic microwave background (CMB) radiation data from the Wilkinson Microwave Anisotropy Probe. We show that the angular fluctuation of the temperature is a Markov process with a Markov angular scale, ΘMarkov = 1.01-0.07+0.09. 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, \Delta T=T(\hat n_1)-T(\hat n_2) . Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.

Item Type: Article
Journal or Publication Title: Journal of Statistical Mechanics: Theory and Experiment
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 9855
Deposited By: Mr Michael Dunne
Deposited On: 24 Jun 2008 14:48
Refereed?: Yes
Published?: Published
Last Modified: 17 Dec 2014 11:42
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9855

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