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Constraints on the variations of fundamental couplings by stellar models

A. Coc 1 S. Ekstrom P. Descouvemont 2 G. Meynet K.A. Olive J.-P. Uzan 3 E. Vangioni 3
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The effect of variations of the fundamental constants on the thermonuclear rate of the triple alpha reaction, 4He(αα, γ)12C, that bridges the gap between 4He and 12C is investigated. We follow the evolution of 15 and 60M zero metallicity star models, up to the end of core helium burning. They are assumed to be representative of the first, Population III stars undergoing a very peculiar evolution due to the absence of initial CNO elements (zero metallicity). The calculated oxygen and carbon bundances resulting from helium burning can then be used to constrain the variations of the fundamental constants.
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Submitted on : Tuesday, June 28, 2011 - 3:53:27 PM
Last modification on : Thursday, December 10, 2020 - 12:31:15 PM

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A. Coc, S. Ekstrom, P. Descouvemont, G. Meynet, K.A. Olive, et al.. Constraints on the variations of fundamental couplings by stellar models. 27th IAU General Assembly, Aug 2009, Rio de Janeiro, Brazil. pp.809, ⟨10.1017/S1743921310009464⟩. ⟨in2p3-00603923⟩



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