Einstein-Cartan pseudoscalaron inflation, reheating and nonthermal leptogenesis
Abstract
We study the postinflationary 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, which controls the inflationary and postinflationary phases. In particular, for γ∼ −1/100 and a lightest Majorana-neutrino mass ≳ 1013 GeV, we find a scalar spectral index ns ∼ 0.970, a tensor-to-scalar ratio r ∼ 0.004, for a number of e-folds before the end of inflation Ne ≲ 60, and a baryon-to-entropy ratio nB/s ∼ 8.7 × 10−11
Versions
Related
- Flavor decoherence and washout timing in nonthermal leptogenesis after inflation
- Leptogenesis with sub-electroweak-scale reheating temperature
- Reconciling nonminimally coupled Higgs inflation with ACT DR6 observations through reheating
- Radiative Corrections and Reheating in Supergravity Models of Inflation
- Effective reheating in Gauss--Bonnet inflation with μ(ϕ,X) coupling
BibTeX
@misc{benedetto2026einsteincartan,
title = {{Einstein-Cartan pseudoscalaron inflation, reheating and nonthermal leptogenesis}},
author = {Carlo Di Benedetto and Alessandro Di Marco and Emanuele Orazi and Gianfranco Pradisi},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2605.09571},
eprint = {2605.09571},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.09571},
}
RIS
TY - UNPB
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 - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2605.09571
UR - https://arxiv.org/abs/2605.09571
AB - We study the postinflationary 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, which controls the inflationary and postinflationary phases. In particular, for γ∼ −1/100 and a lightest Majorana-neutrino mass ≳ 10^13 GeV, we find a scalar spectral index n_s ∼ 0.970, a tensor-to-scalar ratio r ∼ 0.004, for a number of e-folds before the end of inflation N_e ≲ 60, and a baryon-to-entropy ratio n_B/s ∼ 8.7 × 10^−11
ER -