# Landscaping the strong CP problem

@article{Kaloper2017LandscapingTS,
title={Landscaping the strong CP problem},
author={Nemanja Kaloper and John Terning},
journal={Journal of High Energy Physics},
year={2017},
volume={2019},
pages={1-12}
}
• Published 4 October 2017
• Physics
• Journal of High Energy Physics
A bstractOne often hears that the strong CP problem is the one problem which cannot be solved by anthropic reasoning. We argue that this is not so. Due to nonperturbative dynamics, states with a different CP violating paramenter θ acquire different vacuum energies after the QCD phase transition. These add to the total variation of the cosmological constant in the putative landscape of Universes. An interesting possibility arises when the cosmological constant is mostly cancelled by the membrane…
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