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@INPROCEEDINGS{Wirzba:916241,
      author       = {Wirzba, Andreas},
      title        = {{S}trong {CP} {P}roblem},
      volume       = {Regio2021},
      publisher    = {Sissa Medialab Trieste, Italy},
      reportid     = {FZJ-2022-06042},
      pages        = {003-026},
      year         = {2022},
      comment      = {Proceedings of RDP online PhD school and workshop 'Aspects
                      of Symmetry' — PoS(Regio2021) - Sissa Medialab Trieste,
                      Italy, 2022. - ISBN - doi:10.22323/1.412.0003},
      booktitle     = {Proceedings of RDP online PhD school
                       and workshop 'Aspects of Symmetry' —
                       PoS(Regio2021) - Sissa Medialab
                       Trieste, Italy, 2022. - ISBN -
                       doi:10.22323/1.412.0003},
      abstract     = {Quantum chromodynamics, the theory of strong interaction,
                      admits a term which explicitly violates parity P and time
                      reflection invariance T and due to the CPT theorem, also CP.
                      Naturalness would predict this term with strength one,
                      whereas empirical evidence from the electric dipole moment
                      of the neutron yields an upper bound of almost vanishing
                      strength of this term. This is the so-called strong CP
                      problem. In this report, I follow the path from the initial
                      U(1)A problem of strong interaction physics, via the U(1)A
                      anomaly and instantons, the theta vacuum, the electric
                      dipole moment of the neutron and the necessity of explicit
                      symmetry breaking to the Peccei-Quinn model, extended to
                      invisible axions and axion-like particles and finally back
                      to electric dipole moments of subatomic particles.},
      month         = {Nov},
      date          = {2021-11-08},
      organization  = {RDP online PhD school and workshop
                       'Aspects of Symmetry', Online (Rep of
                       Georgia), 8 Nov 2021 - 12 Nov 2021},
      cin          = {IAS-4 / IKP-3},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.22323/1.412.0003},
      url          = {https://juser.fz-juelich.de/record/916241},
}