Multiverse Predictions for Habitability: Number of Potentially Habitable
  Planets
  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.
