Spectral distortions to the CMB from the Recombination of H & He i

Details Spectral distortions to the CMB from the Recombination of H & He i Spectral distortions to the CMB from the Recombination of H & He i

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..146w&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.146

Mathematics

Logic

Scientific paper

All of the atoms in the Universe were ionized at times earlier than about one-hundred-thousand years. When this plasma recombined there must have been several recombination photons produced for every atom -- can we detect these cosmological recombination photons? We have performed the first detailed calculation of the line intensities of the 2p^1s Lyman-alpha transition of hydrogen, as well as for the 2s^1s 2-photon transition of hydrogen and the corresponding He i transitions. The sum of all these lines gives a non-trivial shape to the spectral distortion, which may help tailor an experiment to their detection. Although challenging, detecting these roughly 100 micron distortions would provide incontrovertible evidence that the Universe was once a plasma, and potentially probe the details of physics at the recombination time.

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