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Paper   IPM / P / 8391
School of Physics
  Title:   Characteristic Angular Scales in Cosmic Microwave Background Radiation
1.  F. Ghasemi
2.  A. Bahraminasab
3.  M.S. Movahed
4.  S. Rahvar
5.  K. R. Sreenivasan
6.  M. R. Rahimi Tabar
  Status:   Published
  Journal: J.Stat. Mech: Theory and Experiments
  No.:  11
  Vol.:  November
  Year:  2006
  Pages:   P11008
  Supported by:  IPM
We investigate the stochasticity in temperature fluctuations in the cosmic microwave background (CMB) radiation data from Wilkinson Microwave Anisotropy Probe. We show that the angular fluctuations of the temperature is a Markov process with a Markov angular scale, ΘMarkov=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(n) and its increment, ∆T = T(n1) − T(n2). Through this method we show that temperature fluctuations in the CMB has fat tails compared to a Gaussian distribution.

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