Scalar-scalar-tensor interaction in DHOST theories

IF 1 4区物理与天体物理 Q3 PHYSICS, MATHEMATICAL

Theoretical and Mathematical Physics Pub Date : 2026-06-25 DOI:10.1134/S0040577926060127

V. E. Volkova, S. A. Mironov

引用次数: 0

Abstract

We derive the general cubic action for perturbations about a cosmological background in the quadratic subclass of degenerate higher-order scalar-tensor (DHOST) theories, focusing on scalar-scalar-tensor interactions. We adopt a fully covariant formulation and implement the unitary gauge at the level of perturbations. This mixed sector provides the key ingredient for estimating the decay rate of a gravitational wave into two scalar excitations in the quadratic DHOST models of dark energy in the late-time Universe.

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DHOST理论中的标量-标量-张量相互作用

我们在退化高阶标量张量（DHOST）理论的二次子类中推导了关于宇宙背景的扰动的一般三次作用，重点讨论了标量-标量-张量相互作用。我们采用了一个全协变公式，并在微扰水平上实现了幺正规范。这个混合扇区为估计引力波在晚时间宇宙暗能量二次DHOST模型中变成两个标量激发的衰减率提供了关键成分。

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

Theoretical and Mathematical Physics 物理-物理：数学物理

CiteScore

1.60

自引率

20.00%

发文量

103

审稿时长

4-8 weeks

期刊介绍： Theoretical and Mathematical Physics covers quantum field theory and theory of elementary particles, fundamental problems of nuclear physics, many-body problems and statistical physics, nonrelativistic quantum mechanics, and basic problems of gravitation theory. Articles report on current developments in theoretical physics as well as related mathematical problems. Theoretical and Mathematical Physics is published in collaboration with the Steklov Mathematical Institute of the Russian Academy of Sciences.