Fine-tuning carbon-based life in the universe by the triple-alpha process in red giants

Details Fine-tuning carbon-based life in the universe by the triple-alpha process in red giants Fine-tuning carbon-based life in the universe by the triple-alpha process in red giants

1999-08-23

arxiv.org/abs/astro-ph/9908247v1

Proceedings published by World Scientific, page 197 (2000)

Astronomy and Astrophysics

Astrophysics

9 pages with 1 figure. Invited talk given at the "The Future of the Universe and the Future of Our Civilization" Conference (J

Scientific paper

Through the triple-alpha process occurring in red giant stars the bulk of the carbon existing in our universe is produced. We calculated the change of the triple-alpha reaction rate for slight variations of the nucleon-nucleon force using a microscopic 12-body model. Stellar model calculations for a low-mass, intermediate-mass and massive star using the different triple-alpha reaction rates obtained with different strengths of the N-N interaction have been performed. Even with a change of 0.4% in the strength of N-N force, carbon-based life appears to be impossible, since all the stars then would produce either almost solely carbon or oxygen, but could not produce both elements.

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