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J. McDonald, Does Palatini Higgs Inflation Conserve Unitarity? , JCAP 04
Original
2007
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A. Karam, M. Raidal and E. Tomberg, Gravitational dark matter production in Palatini preheating , JCAP 03
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2007
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I. D. Gialamas, A. Karam, A. Lykkas and T. D. Pappas, Palatini-Higgs inflation with nonminimal derivative coupling , Phys. Rev. D 102
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E. McDonough, A. H. Guth and D. I. Kaiser, Nonminimal Couplings and the Forgotten Field of Axion Inflation , 2010.04179

Then

A. Kozak and A. Borowiec, Palatini frames in scalar-tensor theories of gravity , Eur. Phys. J. C79
Original
2019
Later among the works it cites.
Simons Observatory
Original
2019
Later among the works it cites.
LiteBIRD
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2020
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BICEP, Keck
Original
2021
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A. Salvio, Natural-scalaron inflation , JCAP 10
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2021
Later among the works it cites.

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2025

Natural inflation in Palatini $F(R,X)$

Bostan, N., Dejrah, R. H., Dioguardi, C. et al.

Understand

In the context of Palatini gravity, $F(R+X)$ models, with X the inflaton kinetic term, are characterized by the appealing property of generating asymptotically flat inflaton potentials, exactly like the more commonly studied Palatini $F(R)$ models, but without the complication of non-canonical inflaton kinetic terms in the Einstein frame.

In this paper, we study the case of a Jordan frame potential which is positive and bounded, specifically, natural inflation.
We compute the CMB observables and show that for a wide class of $F(R + X)$ theories, including the quadratic one, natural inflation is still viable.