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Results tagged with cosmic-microwave-background
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user 235113
The cosmic microwave background (CMB) is the electromagnetic radiation in the microwave band which can be observed throughout the whole universe, not connected to any astronomical object. Its spectrum follows a very precise black-body radiation with a temperature of about 2.7 K.
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How do we get the power spectrum through the CMB?
First you have to perturb the background universe (FLRW metric) because the universe is no longer homogeneous and isotropic at small scales.
$$ g_{\mu\nu} = \bar{g}_{\mu\nu} + \delta g_{\mu\nu} \:. $ …
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CMB temperature spectrum
I have read in many references (for instance: http://www.revistacubanadefisica.org/RCFextradata/OldFiles/2019/v36n2/RCF_v36n2_2019_147) that the peaks of the CMB Spectrum is related with the curvature …