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A Model of Anthropic Reasoning, Addressing the Dark to Ordinary Matter Coincidence
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abstract
If inflation occurs after the breaking of Peccei-Quinn symmetry then large values of the breaking scale $F$, which are forbidden in conventional axion cosmology, are permitted, provided that we inhabit a region of the Multiverse where the initial misalignment is small. Regions having approximately this initial misalignment may occupy a small volume of the Multiverse, but they contain a large fraction of potential observers. This scenario has many consequences, including a possible explanation of the approximate equality of dark and baryon matter densities.
Forward citations
Cited by 3 Pith papers
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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
Majoron dark matter is viable for sub-MeV masses in high-scale seesaw models with thermal leptogenesis, produced via misalignment and cosmic strings in pre- and post-inflationary scenarios and constrained by CMB, X-ra...
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