Instanton Interactions and the Axion Weak Gravity Conjecture

@misc{hattab2026instanton,
  title = {{Instanton Interactions and the Axion Weak Gravity Conjecture}},
  author = {Jarod Hattab and Eran Palti},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.16165},
  eprint = {2609.16165},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.16165},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Instanton Interactions and the Axion Weak Gravity Conjecture
AU  - Jarod Hattab
AU  - Eran Palti
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.16165
UR  - https://arxiv.org/abs/2609.16165
AB  - The Weak Gravity Conjecture admits a formulation in terms of long-range charged particle self-interactions being repulsive. We adopt a similar approach to the Axionic Weak Gravity Conjecture by considering long-range instanton interactions. At leading order, in the instanton separation, such interactions are mediated purely by massless scalar fields. Gravitational and gauge interactions are sub-leading. We formulate a repulsive interaction Axionic Weak Gravity Conjecture, which forms a bound on the scalar field dependence of the complex Euclidean instanton action. We show that in standard ultraviolet complete examples, this bound implies the usual formulation of the Axionic Weak Gravity Conjecture, while generally being stronger. Because this formulation is purely a statement about massless scalar fields, it implies that in the absence of massless scalars the usual bound on the axion decay constant could be modified.
ER  -