外表是骗人的:引力子能有质量吗?

IF 5.4 1区 物理与天体物理 Q1 Physics and Astronomy
Leihua Liu, Tomislav Prokopec
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引用次数: 0

摘要

我们研究了大质量费米子场宇宙学背景下的线性引力扰动动力学。我们观察到,当引力和物质作用在宇宙学背景的引力扰动中扩展到二次阶时,引力子似乎具有离壳质量。我们推导了在一般宇宙学背景下线性经典和量子引力扰动演化的两个一致的方程组,并证明了引力子质量在运动方程(on-shell)的水平上消失。在这项工作中,我们考虑了一个宇宙,它的膨胀是由费米子和在同一背景下进化的动态引力子的单环量子反反应驱动的。这些方程控制了一般宇宙物质背景下线性引力扰动的演化。对于大质量狄拉克费米子的简单情况,在宇宙流体的温度与宇宙膨胀速率绝热变化的情况下,进行了具体的单环计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Appearances are deceptive: can graviton have a mass?

We study the dynamics of linear gravitational perturbations on cosmological backgrounds of massive fermionic fields. We observe that, when gravitational and matter action are expanded to quadratic order in gravitational perturbations on cosmological backgrounds, the graviton appears to have an off-shell mass. We derive a consistent set of two equations for the evolution of linear classical and quantum gravitational perturbations on general cosmological backgrounds, and demonstrate that the graviton mass disappears at the level of equations of motion (on-shell). In this work we consider a Universe whose expansion is driven by the one-loop quantum backreaction of fermions, and dynamical gravitons that evolve on that same background. These equations govern the evolution of linear gravitational perturbations on general cosmological matter backgrounds. A concrete one-loop calculation is performed for the simple case of massive Dirac fermions when the temperature of the cosmological fluid changes adiabatically when compared with the expansion rate of the Universe.

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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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