https://doi.org/10.1140/epjc/s10052-025-15059-z
Regular Article - Theoretical Physics
Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling
1
School of Science, Qingdao University of Technology, 266033, Qingdao, China
2
School of Physics and Advanced Energy, Henan University of Technology, 450001, Zhengzhou, China
3
College of Physics and Electronic Information, Inner Mongolia Normal University, 81 Zhaowuda Road, 010022, Hohhot, Inner Mongolia, China
a
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b
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c
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Received:
14
May
2025
Accepted:
9
November
2025
Published online:
18
November
2025
Abstract
In this paper, the scenario of noncanonical warm inflation with nonminimal derivative coupling is introduced, and its primordial non-Gaussianity of perturbations on uniform energy density hypersurfaces is systematically analyzed. The total non-Gaussianity has two complementary components: the three-point correlation denoted by 
, and the four-point correlation denoted by 
. The three-point correlation dominates, and it comes from the intrinsic non-Gaussianity of the inflaton field. In contrast, the four-point correlation is a slow-roll suppressed quantity, which originates from the four-point correlation function of the major Gaussian-part inflaton perturbation and is determined by the background dynamics. These two components of non-Gaussianity are analytically calculated under slow-roll conditions within the noncanonical warm inflation framework with nonminimal derivative coupling. The combined effects of nonminimal derivative coupling, noncanonical kinetic structure, and thermal dissipation crucially determine the non-Gaussian signature, revealing a distinct interplay absent in either cold or minimal warm inflation models. Additionally, comparisons and discussions of these components and the total non-Gaussianity are presented.
© The Author(s) 2025
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