Induced two-photon decay and the rate of hydrogen recombination

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  • 8 August 2005
Abstract
Induced emission of the softer photon slightly increases the two-photon decay rate of the 2s level of hydrogen defining the rate of cosmological recombination. Correspondingly this changes the degree of ionization, the visibility function and the resulting primordial temperature anisotropies and polarization of the CMB on the percent level. These changes exceed the precision of the widely used CMBFAST and CAMB codes by more than one order of magnitude and can be taken into account easily.

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