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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [3];  [1]
+ Show Author Affiliations
  1. Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics and Dept. of Physics
  2. Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
  3. SISSA International School for Advanced Studies, Trieste (Italy)
Publication Date:
Research Org.:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1507771
Grant/Contract Number:  
FG02-04ER41286
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QCD Phenomenology

Citation Formats

Dine, Michael, Haskins, Laurel Stephenson, Ubaldi, Lorenzo, and Xu, Di. Some remarks on anthropic approaches to the strong CP problem. United States: N. p., 2018. Web. doi:10.1007/jhep05(2018)171.
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Dine, Michael, Haskins, Laurel Stephenson, Ubaldi, Lorenzo, & Xu, Di. Some remarks on anthropic approaches to the strong CP problem. United States. https://doi.org/10.1007/jhep05(2018)171
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Dine, Michael, Haskins, Laurel Stephenson, Ubaldi, Lorenzo, and Xu, Di. Mon . "Some remarks on anthropic approaches to the strong CP problem". United States. https://doi.org/10.1007/jhep05(2018)171. https://www.osti.gov/servlets/purl/1507771.
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@article{osti_1507771,
title = {Some remarks on anthropic approaches to the strong CP problem},
author = {Dine, Michael and Haskins, Laurel Stephenson and Ubaldi, Lorenzo and Xu, Di},
abstractNote = {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.},
doi = {10.1007/jhep05(2018)171},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2018,
place = {United States},
year = {2018},
month = {5}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1007/jhep05(2018)171
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Cited by: 10 works
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Figures / Tables:

Figure 1 Figure 1: Left: the shaded region is the portion of the region in ($θ, y$) space that produces an anthropically allowed value for the c.c., as determined by eq. (4.5). The red shading is the portion of this region for which θ < 10-10 [not drawn to scale]. This showsmore » that values of θ of order one are favored by the c.c. anthropic selection. Right: zoomed in to very small θ , drawn to scale.« less
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Publisher’s Note: Dynamics of M-theory vacua [Phys. Rev. D 69 , 106012 (2004)]
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