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
Abstract
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 ...
Subjects
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
Related Organizations
40 references, page 1 of 3

[1] P.A.M. Dirac, The Cosmological Constants, Nature 139 (1937) 323

[2] G. Gamow, Electricity, Gravity and Cosmology, Phys. Rev. Lett. 19 (1967) 759

[3] A. H. Guth, Inflation and Eternal Inflation, Phys. Rep. 333 (2000) 555

[4] A. Vilenkin, Unambiguous Probabilities in an Eternally Inflating Universe, Phys. Rev. Lett. 81 (1998) 5501 [OpenAIRE]

[5] M. J. Rees, Just Six Numbers, Basic Books (2000)

[6] C. J. Hogan, Why the Universe is Just So, Rev. Mod. Phys. 72 (2000) 1149

[7] M. Tegmark, What does Inflation Really Predict? J. Cosmol. Astropart. Phys. 04 (2005) 001

[8] A. Aguirre and M. Tegmark, Multiple Universes, Cosmic Coincidences, and other Dark Matters, J. Cosmol. Astropart. Phys. 01 (2005) 003

[9] M. Tegmark, A. Aguirre, M. J. Rees, and F. Wilczek, Dimensionless Constants, Cosmology, and other Dark Matters, Phys. Rev. D 73 (2006) 3505

[10] A. S. Burrows and J. P. Ostriker, Astronomical Reach of Fundamental Physics, Proc. Nat. Acad. Sci. 111 (2014) 2409

[11] A. N. Schellekens, Life at the Interface of Particle Physics and String Theory, Rev. Mod. Phys. 85 (2013) 1491

[12] B. J. Carr and M. J. Rees, The Anthropic Principle and the Structure of the Physical World, Nature 278 (1979) 611

[13] J. D. Barrow and F. J. Tipler, The Anthropic Cosmological Principle, Oxford Univ. Press (1986)

[14] L. A. Barnes, The Fine-Tuning of the Universe for Intelligent Life, Pub. Astron. Soc. Australia 29 (2012) 529

[15] M. Tegmark and M. J. Rees, Why Is the Cosmic Microwave Background Fluctuation Level 10 5? Mon. Not. R. Astron. Soc. 499 (1998) 526

40 references, page 1 of 3
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