How accurately can we measure the hydrogen 2S->1S transition rate from the cosmological data?

Viatcheslav Mukhanov (1,2) Jaiseung Kim (3,4) Pavel Naselsky (3,4) Tiziana
Trombetti (5,6) Carlo Burigana (6,7) ((1) Arnold-Sommerfeld-Center, Department f¨ur Physik, Ludwig-Maximilians-Universit¨at M¨unchen,Theresienstr. 37, D-80333, Munich, Germany; (2) LPT de l’Ecole Normale Superieure, Chaire Blaise Pascal, 24 rue Lhomond, 75231 Paris cedex, France; (3) Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark; (4) Discovery Center, Blegdamsvej 17, DK-2100 Copenhagen, Denmark;
(5) Dipartimento di Fisica, Universit‘a La Sapienza, P.le A. Moro 2, I-00185 Roma, Italy; (6) INAF-IASF Bologna, Via P. Gobetti 101, I-40129, Bologna, Italy; (7) Dipartimento di Fisica, Universit‘a degli Studi di Ferrara, Via G. Saragat 1, I-44100 Ferrara,Italy)

Recent progress in observational cosmology, and especially the forthcoming PLANCK mission data, open new directions in so-called precision cosmology. In this paper we illustrate this statement considering the accuracy of cosmological determination of the two-quanta decay rate of 2s hydrogen atom state. We show that the PLANCK data will allow us to measure this decay rate significantly better than in the laboratory experiments.

Complete preprint ==> http://arxiv.org/abs/1205.5949

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