宇宙学相关器的前导回路

IF 5 1区 物理与天体物理 Q1 PHYSICS, PARTICLES & FIELDS
Mang Hei Gordon Lee, Ciaran McCulloch, Enrico Pajer
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引用次数: 8

摘要

来自暴胀的抽象宇宙学相关器通常是在树的水平上产生的,因此环路的贡献被限制为微扰的小修正。这里我们将讨论一个情况并非如此的场景。最近研究表明,对于任意数量的任意质量的标量场,由于初始态的选择和一致性,无质量标量的奇偶三谱在精确尺度不变性的极限下必然消失。通过仔细处理紫外线发散,我们发现单环的贡献是不消失的,因此是领先的。令人惊讶的是,单环奇偶三谱仅仅是运动学的一个有理函数,我们在一系列模型中明确地计算了它,包括单时钟膨胀。尽管环路贡献是奇偶奇奇部分的领先项,但其信噪比通常由相应的树级奇偶三谱的信噪比从上面限定,除非两个可观测值的仪器噪声和系统学不同。此外,我们确定了一系列环路对波函数的贡献,这些贡献在计算相关器时完全抵消,这表明了一个更普遍的现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Leading loops in cosmological correlators
A bstract Cosmological correlators from inflation are often generated at tree level and hence loop contributions are bounded to be small corrections by perturbativity. Here we discuss a scenario where this is not the case. Recently, it has been shown that for any number of scalar fields of any mass, the parity-odd trispectrum of a massless scalar must vanish in the limit of exact scale invariance due to unitarity and the choice of initial state. By carefully handling UV-divergences, we show that the one-loop contribution is non-vanishing and hence leading. Surprisingly, the one-loop parity-odd trispectrum is simply a rational function of kinematics, which we compute explicitly in a series of models, including single-clock inflation. Although the loop contribution is the leading term in the parity-odd sector, its signal-to-noise ratio is typically bounded from above by that of a corresponding tree-level parity-even trispectrum, unless instrumental noise and systematics for the two observables differ. Furthermore, we identify a series of loop contributions to the wavefunction that cancel exactly when computing correlators, suggesting a more general phenomenon.
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来源期刊
Journal of High Energy Physics
Journal of High Energy Physics PHYSICS, PARTICLES & FIELDS-
CiteScore
10.00
自引率
46.30%
发文量
2107
审稿时长
12 weeks
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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