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@ARTICLE{Guidetti:478997,
      author       = {Guidetti, Veronica and Righi, Nicole and Venken, Gerben and
                      Westphal, Alexander},
      title        = {{A}xionic {F}estina {L}ente},
      reportid     = {PUBDB-2022-02855, DESY-22-098. arXiv:2206.03494},
      year         = {2022},
      note         = {20 pages, 2 figures},
      abstract     = {The swampland conjecture known as Festina Lente (FL)
                      imposes a lower bound on the mass of all charged particles
                      in a quasi-de Sitter space. In this paper, we propose the
                      aFL (axionic Festina Lente) bound, an extension of FL to
                      axion-like particles arising from type II string theory. We
                      find that the product of the instanton action and the axion
                      decay constant is bounded from below by the vacuum energy.
                      This is achieved indirectly, using dimensional reduction on
                      Calabi-Yau threefolds, and translating the FL result for
                      dipoles into a purely geometric bound. We discuss axionic
                      black holes evolution, and aFL constraints on Euclidean
                      wormholes, showing that the gravitational arguments leading
                      to the FL bound for U$(1)$ charged particles cannot be
                      directly applied to axions. Moreover, we discuss
                      phenomenological implications of the aFL bound, including
                      constraints on string inflation models and the axion-photon
                      coupling via kinetic mixing.},
      keywords     = {mixing, kinetic (INSPIRE) / wormhole, Euclidean (INSPIRE) /
                      axion, decay constant (INSPIRE) / inflation, model (INSPIRE)
                      / instanton, action (INSPIRE) / vacuum state, energy
                      (INSPIRE) / black hole, axion (INSPIRE) / charged particle
                      (INSPIRE) / dimensional reduction (INSPIRE) / gravitation
                      (INSPIRE) / string model (INSPIRE) / string (INSPIRE) /
                      Calabi-Yau (INSPIRE) / dipole (INSPIRE) / axion-like
                      particles (INSPIRE)},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      STRINGFLATION - Inflation in String Theory - Connecting
                      Quantum Gravity with Observations (647995) / EXC 2121 - Das
                      Quantisierte Universum (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(EU-Grant)647995 /
                      G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2206.03494},
      howpublished = {arXiv:2206.03494},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2206.03494;\%\%$},
      doi          = {10.3204/PUBDB-2022-02855},
      url          = {https://bib-pubdb1.desy.de/record/478997},
}