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| Paper IPM / Physic / 8391 |
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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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