Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Characteristic angular scales in cosmic microwave background radiation
AU - Ghasemi, F.
AU - Bahraminasab, A.
AU - Sadegh Movahed, M.
AU - Rahvar, S.
AU - Sreenivasan, K. R.
AU - Reza Rahimi Tabar, M.
PY - 2006/11
Y1 - 2006/11
N2 - 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(\hat n) and its increment, \Delta T=T(\hat n_1)-T(\hat n_2) . Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.
AB - 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(\hat n) and its increment, \Delta T=T(\hat n_1)-T(\hat n_2) . Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.
U2 - 10.1088/1742-5468/2006/11/P11008
DO - 10.1088/1742-5468/2006/11/P11008
M3 - Journal article
JO - Journal of Statistical Mechanics: Theory and Experiment
JF - Journal of Statistical Mechanics: Theory and Experiment
IS - P11008
ER -