Revisiting Tilt and Tensor-to-Scalar Ratio in the Multi-Scalar Field Inflation: Non-Sum-Separable Case

IF 5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics of the Dark Universe Pub Date : 2025-04-26 DOI:10.1016/j.dark.2025.101924

Fereshteh Felegary , Seyed Ali Hosseini Mansoori , Tahere Fallahi Serish , Phongpichit Channuie

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引用次数: 0

Abstract

The canonical multi-scalar field inflation where the kinetic and potential terms are sum-separable is ruled out by the current observations for the chaotic-type potential

V = \sum_{i} μ_{i} ϕ_{i}^{p}

. This paper explores the non-sum-separable case to validate the chaotic-type potential in the multi-scalar field, incorporating a linear coupling term between the kinetic and potential terms in the canonical Lagrangian. This coupling influences the slow-roll parameters and also alters our predictions for the spectral index

n_{s}

and the tensor-to-scalar ratio

r

, which directly depend on those parameters. In fact, compared to standard canonical multi-field inflation, the values of

n_{s}

and

r

decrease to levels consistent with the recent Planck+BICEP/Keck constraint.

查看原文本刊更多论文

再论多标量场膨胀中的倾斜和张量-标量比：不可和可分的情况

目前对混沌型势V=∑iμiϕip的观测排除了动力学项和势项可分离的正则多标量场暴胀。本文通过在正则拉格朗日方程中引入动力学项和势项之间的线性耦合项，探讨了多标量场中不可和可分情况下混沌型势的验证。这种耦合影响了慢滚参数，也改变了我们对光谱指数ns和张量标量比r的预测，它们直接依赖于这些参数。事实上，与标准的规范多场暴胀相比，ns和r的值降低到与最近的普朗克+BICEP/Keck约束一致的水平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics of the Dark Universe ASTRONOMY & ASTROPHYSICS-

CiteScore

9.60

自引率

7.30%

发文量

118

审稿时长

61 days

期刊介绍： Physics of the Dark Universe is an innovative online-only journal that offers rapid publication of peer-reviewed, original research articles considered of high scientific impact. The journal is focused on the understanding of Dark Matter, Dark Energy, Early Universe, gravitational waves and neutrinos, covering all theoretical, experimental and phenomenological aspects.