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Paper   IPM / Physic / 8391
School of Physics
  Title:   Characteristic Angular Scales in Cosmic Microwave Background Radiation
  Author(s): 
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
  Abstract:
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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