skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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]
  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. https://doi.org/10.1007/jhep05(2018)171.
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
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.
@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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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

Save / Share:

Works referenced in this record:

Dimensionless constants, cosmology, and other dark matters
journal, January 2006


Naturally weak CP violation
journal, March 1984


Irrational axions as a solution of the strong CP problem in an eternal universe
journal, December 1991


Anthropic Bound on the Cosmological Constant
journal, November 1987


Vacuum structure in gauge theories. The problem of strong CP violation and cosmology
journal, June 1980


Quantization of four-form fluxes and dynamical neutralization of the cosmological constant
journal, May 2000


Hybrid inflation with Planck scale fields
journal, September 2015

  • Dine, Michael; Stephenson-Haskins, Laurel
  • Journal of High Energy Physics, Vol. 2015, Issue 9
  • DOI: 10.1007/JHEP09(2015)208

Solving the Strong CP Problem without the Peccei-Quinn Symmetry
journal, July 1984


Discrete R symmetries and anomalies
journal, January 2014


R symmetries in the landscape
journal, January 2006


Is there a string theory landscape?
journal, August 2004


Dynamics of M-theory vacua
journal, May 2004


Axionic band structure of the cosmological constant
journal, January 2016


Constraining light dark matter with diffuse X-ray and gamma-ray observations
journal, November 2013

  • Essig, Rouven; Kuflik, Eric; McDermott, Samuel D.
  • Journal of High Energy Physics, Vol. 2013, Issue 11
  • DOI: 10.1007/JHEP11(2013)193

    Figures / Tables found in this record:

      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.