https://doi.org/10.1140/epjc/s10052-024-12482-6
Regular Article - Theoretical Physics
Einstein–Cartan pseudoscalaron inflation
1
Istituto Nazionale di Astrofisica, Istituto di Astrofisica e Planetologia Spaziali (INAF-IAPS), Via Fosso del Cavaliere, 100, 00133, Rome, Italy
2
Escola de Ciência e Tecnologia and International Institute of Physics, Federal University of Rio Grande do Norte, Campus Universitario-Lagoa Nova, 59078-970, Natal, RN, Brazil
3
University of Rome “Tor Vergata” and INFN, Sezione di Roma “Tor Vergata”, Via Della Ricerca Scientifica 1, 00133, Rome, Italy
Received:
18
January
2024
Accepted:
26
January
2024
Published online:
9
February
2024
We study a class of early universe cosmological models based on Einstein–Cartan gravity and including a higher derivative term corresponding to a power of the Holst scalar curvature. The resulting effective action is basically given by General Relativity and an additional neutral pseudoscalar field (the pseudoscalaron), unequivocally related to the corresponding components of the torsion, that necessarily acquire a dynamics. The induced pseudoscalaron potential provides a realistic inflationary phase together with a very rich postinflationary epoch, resulting from the coupling of the pseudoscalaron to ordinary matter.
© The Author(s) 2024
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