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arXiv · 2511.16312

Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling

Xiao-Min Zhang·Run-Qing Zhao·Yun-Cai Feng·Peng-Cheng Chu·Zhi-Peng Peng·Xi-Bin Li
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Abstract

This paper presents and investigates non-Gaussian perturbations for the warm k-inflation model that is driven by pure kinetic energy. The two complementary components of the overall non-Gaussianity are the three-point and four-point correlations. The intrinsic non-Gaussian component, denoted as the nonlinear parameter f_{NL}^{int}, is rooted in the three-point correlation for the inflaton field. Meanwhile, the \delta N part non-Gaussianity, denoted as f_{NL}^{\delta N}, is the contribution attributed to the four-point correlation function of the inflaton field. In this paper, the above two components in warm k-inflation are individually computed and analyzed. Then, comparisons and discussions between them are conducted, and the non-Gaussian theoretical results are compared with experimental observations to determine the range of model parameters within the allowable range of observation.

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Xiao-Min Zhang, Run-Qing Zhao, Yun-Cai Feng, Peng-Cheng Chu, Zhi-Peng Peng, Xi-Bin Li. 2025-11-20. Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling. https://doi.org/10.1140/epjc%2Fs10052-025-15059-z

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