完全可行的DHOST反弹与额外的标量

IF 5.5 1区 物理与天体物理 Q1 Physics and Astronomy
Ok Song An, Jin U Kang, Yong Jin Kim, Ui Ri Mun, Un Gyong Ri
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引用次数: 0

摘要

本文构造了一类具有额外标量场的简并高阶标量张量(DHOST)理论,该理论允许满足以下条件的可行解:(i)不存在Belinski-Khalatnikov-Lifshitz (BKL)不稳定性、幽灵和梯度不稳定性,(ii)不存在超亮度,(iii)产生近尺度不变曲率扰动和非常小的张量与标量比,以及(iv)在遥远的过去和未来的常规渐近性,其中引力部门由广义相对论描述,DHOST标量具有典型的拉格朗日形式。我们还期望我们的模型具有足够小的原始曲率扰动的非高斯性,以便与观测相兼容。因此,这项工作首次证明了完全可行的双场DHOST弹跳宇宙学,它没有不稳定性和超亮度问题,并且与观测相兼容。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fully viable DHOST bounce with extra scalar

In this paper we construct a class of Degenerate Higher-Order Scalar-Tensor (DHOST) theories with an extra scalar field, which admits viable solutions of bouncing universe satisfying the following requirements: (i) absence of Belinski-Khalatnikov-Lifshitz (BKL) instability, ghost and gradient instability, (ii) absence of superluminality, (iii) generation of nearly scale-invariant curvature perturbations and very small tensor-to-scalar ratio, and (iv) conventional asymptotics in the distant past and future, where gravity sector is described by General Relativity and the DHOST scalar has a canonical form of Lagrangian. We also expect our models to have sufficiently small non-Gaussianities of primordial curvature perturbations to be compatible with observations. As such, this work exemplifies for the first time the fully viable two-field DHOST bouncing cosmology, which is free of instability and superluminality problems as well as compatible with observations.

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来源期刊
Journal of High Energy Physics
Journal of High Energy Physics 物理-物理:粒子与场物理
CiteScore
10.30
自引率
46.30%
发文量
2107
审稿时长
1.5 months
期刊介绍: The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).
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