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Peer-reviewedCC BY 4.0Journal of High Energy Physics

New type IIB poly-instanton effects and axion quintessence

  • Luca Caraffi1,2
  • Federico Carta2
  • Michele Cicoli1,2
  1. 1Università di Bologna
  2. 2INFN, Sezione di Bologna
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Abstract

Previous studies of poly-instantons in type IIB Calabi-Yau orientifolds found that these effects arise when Euclidean D3-branes wrap rigid cycles with a Wilson line. In this work, we extend this result through a general analysis of instanton zero modes, revealing the existence of new poly-instanton effects for rigid cycles with a deformation, provided that O3-planes are localised on the worldvolume of the Euclidean D3-brane. We provide concrete Calabi-Yau examples with explicit orientifold involution and brane setup. One of them is particularly well suited for realising axion hilltop quintessence. In particular, the double exponential suppression of poly-instanton effects allows to reproduce the observed vacuum energy for natural values of the underlying parameters.

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Cite

BibTeXRIS
BibTeX
@article{caraffi2026type,
  title = {{New type IIB poly-instanton effects and axion quintessence}},
  author = {Luca Caraffi and Federico Carta and Michele Cicoli},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = nov,
  doi = {10.1007/jhep11(2026)003},
  url = {https://link.springer.com/article/10.1007/JHEP11(2026)003},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - New type IIB poly-instanton effects and axion quintessence
AU  - Luca Caraffi
AU  - Federico Carta
AU  - Michele Cicoli
PY  - 2026
DA  - 2026/11/02
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep11(2026)003
UR  - https://link.springer.com/article/10.1007/JHEP11(2026)003
AB  - Previous studies of poly-instantons in type IIB Calabi-Yau orientifolds found that these effects arise when Euclidean D3-branes wrap rigid cycles with a Wilson line. In this work, we extend this result through a general analysis of instanton zero modes, revealing the existence of new poly-instanton effects for rigid cycles with a deformation, provided that O3-planes are localised on the worldvolume of the Euclidean D3-brane. We provide concrete Calabi-Yau examples with explicit orientifold involution and brane setup. One of them is particularly well suited for realising axion hilltop quintessence. In particular, the double exponential suppression of poly-instanton effects allows to reproduce the observed vacuum energy for natural values of the underlying parameters.
SN  - 1029-8479
ER  -