Some remarks on anthropic approaches to the strong CP problem

Dine, Michael; Haskins, Laurel Stephenson; Ubaldi, Lorenzo; Xu, Di

doi:10.1007/jhep05(2018)171

Title: Some remarks on anthropic approaches to the strong CP problem

Journal Article · 28 May 2018 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep05(2018)171 · OSTI ID:1507771

^[1]; Haskins, Laurel Stephenson ^[2]; Ubaldi, Lorenzo ^[3]; Xu, Di ^[1]

Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics and Dept. of Physics
Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
SISSA International School for Advanced Studies, Trieste (Italy)

The peculiar value of θ is a challenge to the notion of an anthropic landscape. We briefly review the possibility that a suitable axion might arise from an anthropic requirement of dark matter. We then consider an alternative suggestion of Kaloper and Terning that θ might be correlated with the cosmological constant. We note that in a landscape one expects that θ is determined by the expectation value of one or more axions. We discuss how a discretuum of values of θ might arise with an energy distribution dominated by QCD, and find the requirements to be quite stringent. Given such a discretuum, we find no circumstances where small θ might be selected by anthropic requirements on the cosmological constant.

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Research Organization:: Univ. of California, Santa Cruz, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER41286

OSTI ID:: 1507771

Journal Information:: Journal of High Energy Physics (Online), Vol. 2018, Issue 5; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Cited By (4)

Theta in new QCD-like sectors Draper, Patrick; Kozaczuk, Jonathan; Yu, Jiang-Hao arXiv https://doi.org/10.48550/arxiv.1803.00015	text	January 2018
Indirect Signs of the Peccei-Quinn Mechanism de Vries, Jordy; Draper, Patrick; Fuyuto, Kaori arXiv https://doi.org/10.48550/arxiv.1809.10143	text	January 2018
Heterotic M-Theory from the Clockwork Perspective Im, Sang Hui; Nilles, Hans Peter; Olechowski, Marek arXiv https://doi.org/10.48550/arxiv.1811.11838	text	January 2018
The landscape of QCD axion models Di Luzio, Luca; Giannotti, Maurizio; Nardi, Enrico arXiv https://doi.org/10.48550/arxiv.2003.01100	text	January 2020