Characteristic angular scales in cosmic microwave background radiation

被引：18
作者：
Ghasemi, F.
Bahraminasab, A.
Movahed, M. Sadegh
Rahvar, Sohrab
Sreenivasan, K. R.
Tabar, M. Reza Rahimi
机构：
[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[2] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[3] Sharif Univ Technol, Dept Phys, Tehran, Iran
[4] Inst Studies Theoret Phys & Math, Tehran, Iran
[5] Res Inst Astron & Astrophys Maragha, Maragha, Iran
[6] Abdus Salaam Int Ctr Theoret Phys, I-34100 Trieste, Italy
[7] Observ Cote Azur, CNRS, UMR 6202, F-06304 Nice 4, France
来源：
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT | 2006年
关键词：
new applications of statistical mechanics;
D O I：
10.1088/1742-5468/2006/11/P11008
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
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, Theta(Markov) = 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(n) and its increment, Delta T = T(n1) - T(n2). Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.
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页数：17
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