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

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:

^[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)

Publication Date:: Mon May 28 00:00:00 EDT 2018

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         = {Mon May 28 00:00:00 EDT 2018},

  month        = {Mon May 28 00:00:00 EDT 2018}

}

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

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Figures / Tables:

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 »

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Works referenced in this record:

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text, January 2003

Banks, Tom; Dine, Michael; Gorbatov, Elie
arXiv
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Bousso, Raphael; Polchinski, Joseph
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Dine, Michael; Stephenson-Haskins, Laurel
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Constraining light dark matter with diffuse X-ray and gamma-ray observations
journal, November 2013

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Works referencing / citing this record:

Theta in new QCD-like sectors
text, January 2018

Draper, Patrick; Kozaczuk, Jonathan; Yu, Jiang-Hao
arXiv
DOI: 10.48550/arxiv.1803.00015

Indirect Signs of the Peccei-Quinn Mechanism
text, January 2018

de Vries, Jordy; Draper, Patrick; Fuyuto, Kaori
arXiv
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Heterotic M-Theory from the Clockwork Perspective
text, January 2018

Im, Sang Hui; Nilles, Hans Peter; Olechowski, Marek
arXiv
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The landscape of QCD axion models
text, January 2020

Di Luzio, Luca; Giannotti, Maurizio; Nardi, Enrico
arXiv
DOI: 10.48550/arxiv.2003.01100

Figures / Tables found in this record:

Figure 1 (p. 12)

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

Abstract

Citation Formats

Figures / Tables:

Is There A String Theory Landscape text, January 2003

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

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

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

Discrete R symmetries and anomalies journal, January 2014

Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant text, January 2000

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

Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant journal, September 1998

Publisher’s Note: Dynamics of M-theory vacua [Phys. Rev. D 69 , 106012 (2004)] journal, June 2004

Irrational Axions as a Solution of The Strong CP Problem in an Eternal Universe text, January 1991

Theta in new QCD-like sectors text, January 2018

Indirect Signs of the Peccei-Quinn Mechanism text, January 2018

Heterotic M-Theory from the Clockwork Perspective text, January 2018

The landscape of QCD axion models text, January 2020

Is There A String Theory Landscape
text, January 2003

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

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

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

Discrete R symmetries and anomalies
journal, January 2014

Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
text, January 2000

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

Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
journal, September 1998

Publisher’s Note: Dynamics of M-theory vacua [Phys. Rev. D 69 , 106012 (2004)]
journal, June 2004

Irrational Axions as a Solution of The Strong CP Problem in an Eternal Universe
text, January 1991

Theta in new QCD-like sectors
text, January 2018

Indirect Signs of the Peccei-Quinn Mechanism
text, January 2018

Heterotic M-Theory from the Clockwork Perspective
text, January 2018

The landscape of QCD axion models
text, January 2020