期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 199, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/199/1/16
关键词
cosmic background radiation; early universe; molecular processes
资金
- MIUR-Universita degli Studi di Bari (fondi di Ateneo)
- Phys4Entry [242311]
- ERC [267219]
Energy exchange processes play a crucial role in the early universe, affecting the thermal balance and the dynamical evolution of the primordial gas. In the present work we focus on the consequences of a non-thermal distribution of the level populations of H-2: first, we determine the excitation temperatures of vibrational transitions and the non-equilibrium heat transfer; second, we compare the modifications to chemical reaction rate coefficients with respect to the values obtained assuming local thermodynamic equilibrium; and third, we compute the spectral distortions to the cosmic background radiation generated by the formation of H-2 in vibrationally excited levels. We conclude that non-equilibrium processes cannot be ignored in cosmological simulations of the evolution of baryons, although their observational signatures remain below current limits of detection. New fits to the equilibrium and non-equilibrium heat transfer functions are provided.
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