CMB Angular Distribution: Understanding Gaussian Random Fields

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Madster
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Dear all,

I don't understand why the Cosmic Microwave Background's angular distribution is considered to to a Gaussian random field initially.
The rest of the analysis is roughly clear to me, COBE/WMAP/PLANCK measure the CMB Photons and show the temperature fluctuations w.r.t. the mean temperature. On this data a spherical analysis is applied... But where does the GRF come from? What is b.t.w. a geometrical meaning of a GRF?

Thank you very much
 
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Mordred said:
This article may help you hope your math is good lol

http://www.astro.rug.nl/~weygaert/tim1publication/lss2007/computerIII.pdf

the main usage in the CMB is in measurements of the CMB power spectrum.

thanks, my math is sufficient enough to get the script. So still what mechanism makes the CMB a gaussian random field, or to be more precise, let's us initially approximate the description with a GRF and look for fluctuations?
 
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