Natural inflation in Palatini F(R,X)

BOSTAN N., Dejrah R., Dioguardi C., Racioppi A.

Journal of Cosmology and Astroparticle Physics, cilt.2025, sa.7, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2025 Sayı: 7
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1088/1475-7516/2025/07/082
  • Dergi Adı: Journal of Cosmology and Astroparticle Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC, zbMATH
  • Anahtar Kelimeler: gravity, inflation, modified gravity
  • Marmara Üniversitesi Adresli: Evet

Özet

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.