Next Article in Journal
Reflections on the Covariance of Modified Teleparallel Theories of Gravity
Next Article in Special Issue
Multiverse Predictions for Habitability: Fraction of Planets that Develop Life
Previous Article in Journal
Detecting the Hadron-Quark Phase Transition with Gravitational Waves
Previous Article in Special Issue
Time Reversal Symmetry in Cosmology and the Creation of a Universe–Antiuniverse Pair
Open AccessArticle

Multiverse Predictions for Habitability: Number of Potentially Habitable Planets

Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA
Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
Universe 2019, 5(6), 157;
Received: 14 May 2019 / Revised: 18 June 2019 / Accepted: 21 June 2019 / Published: 25 June 2019
(This article belongs to the Special Issue The Multiverse)
How good is our universe at making habitable planets? The answer to this depends on which factors are important for life: Does a planet need to be Earth mass? Does it need to be inside the temperate zone? are systems with hot Jupiters habitable? Here, we adopt different stances on the importance of each of these criteria to determine their effects on the probabilities of measuring the observed values of several physical constants. We find that the presence of planets is a generic feature throughout the multiverse, and for the most part conditioning on their particular properties does not alter our conclusions much. We find conflict with multiverse expectations if planetary size is important and it is found to be uncorrelated with stellar mass, or the mass distribution is too steep. The existence of a temperate circumstellar zone places tight lower bounds on the fine structure constant and electron to proton mass ratio. View Full-Text
Keywords: multiverse; habitability; planets multiverse; habitability; planets
Show Figures

Figure 1

MDPI and ACS Style

Sandora, M. Multiverse Predictions for Habitability: Number of Potentially Habitable Planets. Universe 2019, 5, 157.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop