# 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} }

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…

## 11 Citations

### Some remarks on anthropic approaches to the strong CP problem

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- 2018

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### ACFI-T 18-16 Indirect Signs of the Peccei-Quinn Mechanism

- Physics
- 2018

In the Standard Model, the renormalization of the QCD vacuum angle θ is extremely tiny, and small θ is technically natural. In the general Standard Model effective field theory (SMEFT), however, ∆θ…

### Challenges for heavy QCD axion inflation

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### Indirect signs of the Peccei-Quinn mechanism

- PhysicsPhysical Review D
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In the Standard Model, the renormalization of the QCD vacuum angle $\theta$ is extremely tiny, and small $\theta$ is technically natural. In the general Standard Model effective field theory (SMEFT),…

### Irrational monodromies of vacuum energy

- PhysicsJournal of High Energy Physics
- 2019

Abstract
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### P not PQ

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- 2021

Abstract
Parity solutions to the strong CP problem are a compelling alternative to approaches based on Peccei-Quinn symmetry, particularly given the expected violation of global symmetries in a…

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- Physics
- 2020

We investigate the impact of the QCD vacuum at nonzero $\theta$ on the properties of light nuclei, Big Bang nucleosynthesis, and stellar nucleosynthesis. Our analysis starts with a calculation of the…

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- PhysicsPhysical Review D
- 2018

New QCD-like `hypercolor' sectors can generate a broad class of new signatures at hadron colliders and furnish a variety of dark matter candidates. Paired diboson resonances are a particularly…

### Topological couplings in higher derivative extensions of supersymmetric three-form gauge theories

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- 2019

A bstractWe consider a topological coupling between a pseudo-scalar field and a 3- form gauge field in N=1$$ \mathcal{N}=1 $$ supersymmetric higher derivative 3-form gauge theories in four spacetime…

### Naturalness: A Snowmass White Paper

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- 2022

We assess the state of naturalness in high-energy physics and summarize recent approaches to the three major naturalness problems: the cosmological constant problem, the electroweak hierarchy…

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