Characteristic angular scales in cosmic microwave background radiation

F. Ghasemi, A. Bahraminasab, M. Sadegh Movahed, Sohrab Rahvar, K. R. Sreenivasan, M. Reza Rahimi Tabar

Research output: Contribution to journalArticle

Abstract

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 (n̂)and its increment, ∇ T = T(n̂2). Through this method we show that temperature fluctuations in the CMB have fat tails compared to a Gaussian distribution.

Original languageEnglish (US)
Article numberP11008
JournalJournal of Statistical Mechanics: Theory and Experiment
Issue number11
DOIs
StatePublished - Nov 1 2006

Fingerprint

cosmic microwave background radiation
Microwave
Radiation
Fluctuations
Fat Tails
microwaves
Microwave Anisotropy Probe
Markov processes
Stochasticity
Langevin Equation
fats
Fokker-Planck Equation
Temperature Field
normal density functions
Markov Process
Increment
temperature
Gaussian distribution
Anisotropy
temperature distribution

Keywords

  • New applications of statistical mechanics

ASJC Scopus subject areas

  • Statistics and Probability
  • Statistical and Nonlinear Physics

Cite this

Characteristic angular scales in cosmic microwave background radiation. / Ghasemi, F.; Bahraminasab, A.; Movahed, M. Sadegh; Rahvar, Sohrab; Sreenivasan, K. R.; Tabar, M. Reza Rahimi.

In: Journal of Statistical Mechanics: Theory and Experiment, No. 11, P11008, 01.11.2006.

Research output: Contribution to journalArticle

Ghasemi, F. ; Bahraminasab, A. ; Movahed, M. Sadegh ; Rahvar, Sohrab ; Sreenivasan, K. R. ; Tabar, M. Reza Rahimi. / Characteristic angular scales in cosmic microwave background radiation. In: Journal of Statistical Mechanics: Theory and Experiment. 2006 ; No. 11.
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