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PreprintarXiv licencearXiv

New Effects in Multifield Cosmology Coupled to the Gauss-Bonnet Term

  • Lilia Anguelova
  • Sonia Paban
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Abstract

We study the rapid-turn regime of multifield cosmology coupled to the Gauss-Bonnet term. We derive the corresponding modified relations between the inflationary Hubble and potential slow-roll parameters, in the two-field case. These relations show that including the Gauss-Bonnet coupling broadens the possibilities for realizing rapid turn inflation and for satisfying the swampland conjectures. We also derive a consistency condition relating the scalar field-space metric to the scalar potential and the Gauss-Bonnet coupling, which two-field slow-roll and rapid-turn inflationary solutions have to satisfy. Finally, we find general conditions under which phantom-like behavior is possible in multifield dark energy models coupled to the Gauss-Bonnet term. Notably, although we do not consider a direct interaction between dark matter and dark energy, dark matter is crucial for the occurrence of a phantom regime.

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Cite

BibTeXRIS
BibTeX
@misc{anguelova2026effects,
  title = {{New Effects in Multifield Cosmology Coupled to the Gauss-Bonnet Term}},
  author = {Lilia Anguelova and Sonia Paban},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.41636},
  eprint = {2610.41636},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.41636},
}
RIS
TY  - UNPB
TI  - New Effects in Multifield Cosmology Coupled to the Gauss-Bonnet Term
AU  - Lilia Anguelova
AU  - Sonia Paban
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.41636
UR  - https://arxiv.org/abs/2610.41636
AB  - We study the rapid-turn regime of multifield cosmology coupled to the Gauss-Bonnet term. We derive the corresponding modified relations between the inflationary Hubble and potential slow-roll parameters, in the two-field case. These relations show that including the Gauss-Bonnet coupling broadens the possibilities for realizing rapid turn inflation and for satisfying the swampland conjectures. We also derive a consistency condition relating the scalar field-space metric to the scalar potential and the Gauss-Bonnet coupling, which two-field slow-roll and rapid-turn inflationary solutions have to satisfy. Finally, we find general conditions under which phantom-like behavior is possible in multifield dark energy models coupled to the Gauss-Bonnet term. Notably, although we do not consider a direct interaction between dark matter and dark energy, dark matter is crucial for the occurrence of a phantom regime.
ER  -