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Dimensionless constants, cosmology and other dark matters
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We identify 31 dimensionless physical constants required by particle physics and cosmology, and emphasize that both microphysical constraints and selection effects might help elucidate their origin. Axion cosmology provides an instructive example, in which these two kinds of arguments must both be taken into account, and work well together. If a Peccei-Quinn phase transition occurred before or during inflation, then the axion dark matter density will vary from place to place with a probability distribution. By calculating the net dark matter halo formation rate as a function of all four relevant cosmological parameters and assessing other constraints, we find that this probability distribution, computed at stable solar systems, is arguably peaked near the observed dark matter density. If cosmologically relevant WIMP dark matter is discovered, then one naturally expects comparable densities of WIMPs and axions, making it important to follow up with precision measurements to determine whether WIMPs account for all of the dark matter or merely part of it.
Forward citations
Cited by 6 Pith papers
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String Axiverse
String theory predicts an axiverse of ultralight axions whose effects on CMB polarization, matter power spectrum, and black hole superradiance can be probed by future astrophysical experiments.
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Dark Matter and Naturalness
A dark SU(3)xSU(2) gauge theory with one generation of chiral fermions naturally produces stable dark baryons with mass around 150 TeV as the dark matter.
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QCD Axion on Hilltop by a Phase Shift of $\pi$
A heavy axion inflaton can shift the QCD axion potential by π, placing the QCD axion at the hilltop and allowing f_a ≳ 3×10^9 GeV to explain all dark matter.
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Majoron Dark Matter, High-Scale Seesaw, and Leptogenesis
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A gentle introduction to the cosmological multiverse
An accessible overview of general relativity, the cosmological constant problem, and the multiverse as a hypothetical solution, while noting the unresolved measure problem of eternal inflation.
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