publication . Article . Preprint . 2015

Constraints on Alternate Universes: Stars and habitable planets with different fundamental constants

Adams, Fred C.;
Open Access
  • Published: 21 Nov 2015 Journal: Journal of Cosmology and Astroparticle Physics, volume 2,016, pages 42-42 (eissn: 1475-7516, Copyright policy)
  • Publisher: IOP Publishing
This paper develops constraints on the values of the fundamental constants that allow universes to be habitable. We focus on the fine structure constant $\alpha$ and the gravitational structure constant $\alpha_G$, and find the region in the $\alpha$-$\alpha_G$ plane that supports working stars and habitable planets. This work is motivated, in part, by the possibility that different versions of the laws of physics could be realized within other universes. The following constraints are enforced: [A] long-lived stable nuclear burning stars exist, [B] planetary surface temperatures are hot enough to support chemical reactions, [C] stellar lifetimes are long enough ...
arXiv: Astrophysics::Earth and Planetary Astrophysics
free text keywords: Astronomy and Astrophysics, Planet, Star formation, Habitability of orange dwarf systems, Planetary habitability, Gravitation, Astronomy, Universe, media_common.quotation_subject, media_common, Galaxy, Stars, Physics, Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
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