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Multiverse—Too Much or Not Enough?
Open AccessArticle

Multiverse Predictions for Habitability: The Number of Stars and Their Properties

1
Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA
2
Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
Universe 2019, 5(6), 149; https://doi.org/10.3390/universe5060149
Received: 14 May 2019 / Revised: 7 June 2019 / Accepted: 10 June 2019 / Published: 13 June 2019
(This article belongs to the Special Issue The Multiverse)
In a multiverse setting, we expect to be situated in a universe that is exceptionally good at producing life. Though the conditions for what life needs to arise and thrive are currently unknown, many will be tested in the coming decades. Here we investigate several different habitability criteria, and their influence on multiverse expectations: Does complex life need photosynthesis? Is there a minimum timescale necessary for development? Can life arise on tidally locked planets? Are convective stars habitable? Variously adopting different stances on each of these criteria can alter whether our observed values of the fine structure constant, the electron to proton mass ratio, and the strength of gravity are typical to high significance. This serves as a way of generating predictions for the requirements of life that can be tested with future observations, any of which could falsify the multiverse scenario. View Full-Text
Keywords: multiverse; habitability; stars multiverse; habitability; stars
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Sandora, M. Multiverse Predictions for Habitability: The Number of Stars and Their Properties. Universe 2019, 5, 149.

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