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PreprintCC BY 4.0arXiv

Palatini inflationary (non-)attractors: Universal mapping of observables

  • Christian Dioguardi
  • Francesco Gianesello
  • Antonio Racioppi
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Abstract

We study single-field slow-roll inflation in the context of Palatini gravity for the class of non-minimally coupled ξ-attractors, i.e.,\ models where the same function f(ϕ) fixes both the non-minimal coupling, 1+ξf(ϕ), and the inflationary potential, V(ϕ) = M4 f(ϕ)2. For an arbitrary f(ϕ), the number of e-folds is, at leading order, independent of ξ. Thanks to this, we provide an immediate mapping between the observables of the non-minimally coupled setup and those of the minimally coupled one. In the strong coupling limit, the tensor-to-scalar ratio is, as usual, suppressed, while the scalar spectral index is shifted towards larger values, with the magnitude of the shift depending only on the tensor-to-scalar ratio associated with the original potential V(ϕ).

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Cite

BibTeXRIS
BibTeX
@misc{dioguardi2026palatini,
  title = {{Palatini inflationary (non-)attractors: Universal mapping of observables}},
  author = {Christian Dioguardi and Francesco Gianesello and Antonio Racioppi},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.20622},
  eprint = {2609.20622},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.20622},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Palatini inflationary (non-)attractors: Universal mapping of observables
AU  - Christian Dioguardi
AU  - Francesco Gianesello
AU  - Antonio Racioppi
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.20622
UR  - https://arxiv.org/abs/2609.20622
AB  - We study single-field slow-roll inflation in the context of Palatini gravity for the class of non-minimally coupled ξ-attractors, i.e.,\ models where the same function f(ϕ) fixes both the non-minimal coupling, 1+ξf(ϕ), and the inflationary potential, V(ϕ) = M^4 f(ϕ)^2. For an arbitrary f(ϕ), the number of e-folds is, at leading order, independent of ξ. Thanks to this, we provide an immediate mapping between the observables of the non-minimally coupled setup and those of the minimally coupled one. In the strong coupling limit, the tensor-to-scalar ratio is, as usual, suppressed, while the scalar spectral index is shifted towards larger values, with the magnitude of the shift depending only on the tensor-to-scalar ratio associated with the original potential V(ϕ).
ER  -