Characteristic angular scales in cosmic microwave background radiation

F. Ghasemi, A. Bahraminasab, M. Sadegh Movahed, Sohrab Rahvar, K. R. Sreenivasan, M. Reza Rahimi Tabar

Research output: Contribution to journalReview articlepeer-review


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 (n̂)and its increment, ∇ T = T(n̂2). Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.

Original languageEnglish (US)
Article numberP11008
JournalJournal of Statistical Mechanics: Theory and Experiment
Issue number11
StatePublished - Nov 1 2006


  • New applications of statistical mechanics

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Statistics, Probability and Uncertainty


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