Landscaping the strong CP problem

Kaloper, Nemanja; Terning, John

doi:10.1007/jhep03(2019)032

Title: Landscaping the strong CP problem

Abstract

One 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 nucleation mechanism. If the step size in the resulting discretuum of cosmological constants, ΔΛ, is in the interval (meV)⁴< ΔΛ < (100 MeV)⁴, the cancellation of vacuum energy can be assisted by the scanning of θ. For (meV)⁴ < ΔΛ < (keV)⁴ this may yield θ < 10^-10, meeting the observational limits. This scenario opens up 24 orders of magnitude of acceptable parameter space for ΔΛ compared to membrane nucleation acting alone. In such a Universe one may not need a light axion to solve the strong CP problem.

Authors:

Kaloper, Nemanja ^[1]; Terning, John ^[1]

Univ. of California, Davis, CA (United States). Dept. of Physics

Publication Date:: Wed Mar 06 00:00:00 EST 2019

Research Org.:: Univ. of California, Davis, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1611303

Grant/Contract Number:: SC0009999

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: 2019; Journal Issue: 3; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Cosmology of Theories beyond the SM; Flux compactifications; Phase Diagram of QCD

Citation Formats


                    Kaloper, Nemanja, and Terning, John. Landscaping the strong CP problem.  United States: N. p., 2019. 
Web.  doi:10.1007/jhep03(2019)032.

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                    Kaloper, Nemanja, & Terning, John. Landscaping the strong CP problem.  United States.  https://doi.org/10.1007/jhep03(2019)032

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                    Kaloper, Nemanja, and Terning, John. Wed .  
"Landscaping the strong CP problem".  United States.  https://doi.org/10.1007/jhep03(2019)032.  https://www.osti.gov/servlets/purl/1611303.

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@article{osti_1611303,

  title        = {Landscaping the strong CP problem},

  author       = {Kaloper, Nemanja and Terning, John},

  abstractNote = {One 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 nucleation mechanism. If the step size in the resulting discretuum of cosmological constants, ΔΛ, is in the interval (meV)4< ΔΛ < (100 MeV)4, the cancellation of vacuum energy can be assisted by the scanning of θ. For (meV)4 < ΔΛ < (keV)4 this may yield θ < 10-10, meeting the observational limits. This scenario opens up 24 orders of magnitude of acceptable parameter space for ΔΛ compared to membrane nucleation acting alone. In such a Universe one may not need a light axion to solve the strong CP problem.},

  doi          = {10.1007/jhep03(2019)032},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 3,

  volume       = 2019,

  place        = {United States},

  year         = {Wed Mar 06 00:00:00 EST 2019},

  month        = {Wed Mar 06 00:00:00 EST 2019}

}

Copy to clipboard

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Title: Landscaping the strong CP problem

Abstract

Citation Formats

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

Sequestering the Standard Model Vacuum Energy journal, March 2014

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

A universe without weak interactions journal, August 2006

Naturalness, Chiral Symmetry, and Spontaneous Chiral Symmetry Breaking book, January 1980

The inflationary Universe journal, August 1984

The cosmological constant from the QCD Veneziano ghost journal, April 2010

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

Neutralization of the cosmological constant by membrane creation journal, February 1988

Hidden constants: The θ parameter of QCD and the cosmological constant of N = 8 supergravity journal, December 1980

Inflation and axion cosmology journal, February 1988

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

Dark matter and the anthropic principle journal, December 2005

Axions in inflationary cosmology journal, April 1991

Is there a string theory landscape? journal, August 2004

On likely values of the cosmological constant journal, March 2000

Parity Conservation in Quantum Chromodynamics journal, August 1984

A Possible Solution to the Strong CP Problem journal, April 2009

Hidden constants: The θ parameter of QCD and the cosmological constant of N = 8 supergravity journal, December 1980

Problem of Strong P and T Invariance in the Presence of Instantons journal, January 1978

Dynamical neutralization of the cosmological constant journal, September 1987

Axial-Vector Vertex in Spinor Electrodynamics journal, January 1969

Calculation of the axion mass based on high-temperature lattice quantum chromodynamics journal, November 2016

String axiverse journal, June 2010

Current algebra theorems for the U(1) “Goldstone boson” journal, September 1979

Chiral estimate of the electric dipole moment of the neutron in quantum chromodynamics journal, December 1979

Gravitational effects on and of vacuum decay journal, June 1980

A mechanism for reducing the value of the cosmological constant journal, January 1985

Chiral estimate of the electric dipole moment of the neutron in quantum chromodynamics journal, April 1980

TCP, quantum gravity, the cosmological constant and all that... journal, January 1985

Cosmological constant and the strong CP problem journal, June 1988

A PCAC puzzle: π0→γγ in the σ-model journal, March 1969

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

The topological susceptibility in finite temperature QCD and axion cosmology journal, November 2016

Foundations and working pictures in microphysical cosmology journal, February 1984

Manifestly Local Theory of Vacuum Energy Sequestering journal, February 2016

The secret long range force in quantum field theories with instantons journal, October 1978

Why is the Cosmological Constant so Small? journal, June 1981

CP Conservation in the Presence of Pseudoparticles journal, June 1977

A New Light Boson? journal, January 1978

Cosmological and astrophysical probes of vacuum energy journal, June 2016

Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules journal, September 1999

Phase transitions in gauge theories and cosmology journal, March 1979

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

Sequestering the Standard Model Vacuum Energy
journal, March 2014

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

A universe without weak interactions
journal, August 2006

Naturalness, Chiral Symmetry, and Spontaneous Chiral Symmetry Breaking
book, January 1980

The inflationary Universe
journal, August 1984

The cosmological constant from the QCD Veneziano ghost
journal, April 2010

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

Neutralization of the cosmological constant by membrane creation
journal, February 1988

Hidden constants: The θ parameter of QCD and the cosmological constant of N = 8 supergravity
journal, December 1980

Inflation and axion cosmology
journal, February 1988

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

Dark matter and the anthropic principle
journal, December 2005

Axions in inflationary cosmology
journal, April 1991

Is there a string theory landscape?
journal, August 2004

On likely values of the cosmological constant
journal, March 2000

Parity Conservation in Quantum Chromodynamics
journal, August 1984

A Possible Solution to the Strong CP Problem
journal, April 2009

Hidden constants: The θ parameter of QCD and the cosmological constant of N = 8 supergravity
journal, December 1980

Problem of Strong $P$ and $T$ Invariance in the Presence of Instantons
journal, January 1978

Dynamical neutralization of the cosmological constant
journal, September 1987

Axial-Vector Vertex in Spinor Electrodynamics
journal, January 1969

Calculation of the axion mass based on high-temperature lattice quantum chromodynamics
journal, November 2016

String axiverse
journal, June 2010

Current algebra theorems for the U(1) “Goldstone boson”
journal, September 1979

Chiral estimate of the electric dipole moment of the neutron in quantum chromodynamics
journal, December 1979

Gravitational effects on and of vacuum decay
journal, June 1980

A mechanism for reducing the value of the cosmological constant
journal, January 1985

Chiral estimate of the electric dipole moment of the neutron in quantum chromodynamics
journal, April 1980

TCP, quantum gravity, the cosmological constant and all that...
journal, January 1985

Cosmological constant and the strong CP problem
journal, June 1988

A PCAC puzzle: π0→γγ in the σ-model
journal, March 1969

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

The topological susceptibility in finite temperature QCD and axion cosmology
journal, November 2016

Foundations and working pictures in microphysical cosmology
journal, February 1984

Manifestly Local Theory of Vacuum Energy Sequestering
journal, February 2016

The secret long range force in quantum field theories with instantons
journal, October 1978

Why is the Cosmological Constant so Small?
journal, June 1981

$CP$ Conservation in the Presence of Pseudoparticles
journal, June 1977

A New Light Boson?
journal, January 1978

Cosmological and astrophysical probes of vacuum energy
journal, June 2016

Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules
journal, September 1999

Phase transitions in gauge theories and cosmology
journal, March 1979