Einstein–Cartan pseudoscalaron inflation, reheating and nonthermal leptogenesis
4 affiliations
- 1University of Rome “Tor Vergata”
- 2INFN, Sezione di Roma “Tor Vergata”
- 3Istituto Nazionale di Astrofisica, Istituto di Astrofisica e Planetologia Spaziali (INAF-IAPS)
- 4Federal University of Rio Grande do Norte, Campus Universitário- Lagoa Nova
Abstract
We study the post-inflationary dynamics of an Einstein–Cartan–Holst gravity-motivated inflationary scenario, known as Einstein–Cartan pseudoscalaron inflation, coupled to a type I seesaw extension of the Standard Model with three heavy right-handed Majorana neutrinos. In particular, we show that nonthermal leptogenesis emerges as a necessary and self-consistent mechanism for generating the observed baryon asymmetry of the Universe, mainly because of the universal coupling of the inflaton to the additional heavy Majorana fermions. The resulting framework provides theoretical predictions that are fully compatible with the latest cosmological constraints from the cosmic microwave background, baryon acoustic oscillations, and Big Bang nucleosynthesis, as well as with neutrino oscillation experiments, for a wide range of the fundamental Barbero–Immirzi model parameter γ γ , which controls the inflationary and post-inflationary phases. In particular, for γ ∼ −1/100 γ ∼ - 1 / 100 and a lightest Majorana-neutrino mass > rsim 1013 ≳ 10 13 GeV, we find a scalar spectral index ns ∼ 0.970 n s ∼ 0.970 , a tensor-to-scalar ratio r ∼ 0.004 r ∼ 0.004 , for a number of e -folds before the end of inflation Ne ≲ 60 N e ≲ 60 , and a baryon-to-entropy ratio nB/s ∼ 8.7 × 10−11 n B / s ∼ 8.7 × 10 - 11 .
Versions
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BibTeX
@article{benedetto2026einsteincartan,
title = {{Einstein–Cartan pseudoscalaron inflation, reheating and nonthermal leptogenesis}},
author = {Carlo Di Benedetto and Alessandro Di Marco and Emanuele Orazi and Gianfranco Pradisi},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16310-x},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16310-x},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Einstein–Cartan pseudoscalaron inflation, reheating and nonthermal leptogenesis
AU - Carlo Di Benedetto
AU - Alessandro Di Marco
AU - Emanuele Orazi
AU - Gianfranco Pradisi
PY - 2026
DA - 2026/10/22
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16310-x
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16310-x
AB - We study the post-inflationary dynamics of an Einstein–Cartan–Holst gravity-motivated inflationary scenario, known as Einstein–Cartan pseudoscalaron inflation, coupled to a type I seesaw extension of the Standard Model with three heavy right-handed Majorana neutrinos. In particular, we show that nonthermal leptogenesis emerges as a necessary and self-consistent mechanism for generating the observed baryon asymmetry of the Universe, mainly because of the universal coupling of the inflaton to the additional heavy Majorana fermions. The resulting framework provides theoretical predictions that are fully compatible with the latest cosmological constraints from the cosmic microwave background, baryon acoustic oscillations, and Big Bang nucleosynthesis, as well as with neutrino oscillation experiments, for a wide range of the fundamental Barbero–Immirzi model parameter γ γ , which controls the inflationary and post-inflationary phases. In particular, for γ ∼ −1/100 γ ∼ - 1 / 100 and a lightest Majorana-neutrino mass > rsim 10^13 ≳ 10 13 GeV, we find a scalar spectral index n_s ∼ 0.970 n s ∼ 0.970 , a tensor-to-scalar ratio r ∼ 0.004 r ∼ 0.004 , for a number of e -folds before the end of inflation N_e ≲ 60 N e ≲ 60 , and a baryon-to-entropy ratio n_B/s ∼ 8.7 × 10^−11 n B / s ∼ 8.7 × 10 - 11 .
SN - 1434-6044
SN - 1434-6052
ER -