Pseudo-Nambu-Goldstone inflation with ZN symmetric waterfall fields
- 1Chung-Ang University
- 2Deutsches Elektronen-Synchrotron DESY
Abstract
A bstract : We propose a hybrid inflation model where a pseudo-Nambu-Goldstone boson inflaton couples to N waterfall scalar fields respecting a Z N symmetry. We identify the phases for the inflation and the consequent waterfall transition, concretely, in Z ₂ , Z ₃ and Z ₄ cases. From the Coleman-Weinberg potential for the inflaton, we show that the quadratically divergent corrections coming from the waterfall sector are cancelled due to the Z N symmetry, while the logarithmically divergent corrections are absent only for N > 2, ensuring the radiative stability of the inflaton potential. We show the parameter space for a successful inflation with the loop-corrected inflaton potential in each model and compare the results between different discrete symmetries. We further analyze the vacuum structure of the models and the reheating process due to the Z N -invariant Higgs-portal couplings for the waterfall fields. We find that the maximum temperature can be smaller than the mass of the waterfall field condensate such that the Z N symmetry is not restored after reheating and there is no domain wall problem in the models. We also comment on the possibility of multi-component dark matter from the Z N partners of the waterfall field condensate.
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BibTeX
@article{lee2026pseudonambugoldstone,
title = {{Pseudo-Nambu-Goldstone inflation with ZN symmetric waterfall fields}},
author = {Hyun Min Lee and Adriana G. Menkara},
journal = {Journal of High Energy Physics},
year = {2026},
month = oct,
doi = {10.1007/jhep10(2026)222},
url = {https://link.springer.com/article/10.1007/JHEP10(2026)222},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Pseudo-Nambu-Goldstone inflation with ZN symmetric waterfall fields
AU - Hyun Min Lee
AU - Adriana G. Menkara
PY - 2026
DA - 2026/10/21
JO - Journal of High Energy Physics
DO - 10.1007/jhep10(2026)222
UR - https://link.springer.com/article/10.1007/JHEP10(2026)222
AB - A bstract : We propose a hybrid inflation model where a pseudo-Nambu-Goldstone boson inflaton couples to N waterfall scalar fields respecting a Z N symmetry. We identify the phases for the inflation and the consequent waterfall transition, concretely, in Z ₂ , Z ₃ and Z ₄ cases. From the Coleman-Weinberg potential for the inflaton, we show that the quadratically divergent corrections coming from the waterfall sector are cancelled due to the Z N symmetry, while the logarithmically divergent corrections are absent only for N > 2, ensuring the radiative stability of the inflaton potential. We show the parameter space for a successful inflation with the loop-corrected inflaton potential in each model and compare the results between different discrete symmetries. We further analyze the vacuum structure of the models and the reheating process due to the Z N -invariant Higgs-portal couplings for the waterfall fields. We find that the maximum temperature can be smaller than the mass of the waterfall field condensate such that the Z N symmetry is not restored after reheating and there is no domain wall problem in the models. We also comment on the possibility of multi-component dark matter from the Z N partners of the waterfall field condensate.
SN - 1029-8479
ER -