Title: Fluctuations in Cosmic Microwave Background Radiation
Abstract: Cosmic microwave background (CMB) radiation is composed of photons which have decoupled from electrons in the epoch of the hydrogen and helium recombination at \(z = 1{,}089\) and it is observed as the perfectly black body radiation whose averaged temperature is 2.725 K. More precisely, however, the CMB involves tiny spatial fluctuations. Theoretically, the density contrast of the CMB is computed in the system where photons, neutrinos, baryons, dark matters and dark energy exist in the gravitational potential. Compared with the observational data, the values of several key parameters have been well-determined. In this chapter, we describe all-sky and flat-sky formalism for CMB fluctuations including the temperature and polarization from the scalar, vector, and tensor perturbations on the basis of our paper, and summarize current outputs from the analysis of the CMB power spectra. This formalism is very useful for computation of the CMB bispectrum composed of vector and tensor modes.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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