Phase transitions in strongly coupled extensions of the Standard Model

标准模型强耦合扩展中的相变

• 批准号: 2131471
• 金额: --
• 依托单位: University of Sussex
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2131471
• 关键词: Phase; transitions; strongly; coupled; extensions

After the discovery of the Higgs boson in 2012 at LHC, understanding the origin ofthe electroweak scale remains a prime goal of particle physics. Having the Higgs asa bound state of some strongly coupled new dynamics is an attractive possibility,which has given risen to a great deal of theoretical work in the last 10 years and isalso actively looked for experimentally. This goes particularly under the name of"composite Higgs".It is quite possible that the confinement-deconfinement process in such a theorygoes via a first order phase transition when the universe cooles down. Such atransition would happen at the TeV scale, and could generate a stochasticbackground of gravitational waves, which can by searched for with space basedgravitational wave interferometers, such as LISA (to be launched in the 2030ies).The project will study phase transitions composite Higgs-like setups by using thetechnique of holography, where the 4D strongly coupled model is described by a 5Dtheory including gravity. The aim will be to understand the main thermodynamicsquantities of such transitions, such as latent heat, bubble wall properties and thenucleation rate. This will be sufficient to predict the gravitational wave signal of sucha model. In parallel we will aim to crosslink the phase transition to LHC studies.

2012 年大型强子对撞机发现希格斯玻色子之后，了解电弱尺度的起源仍然是粒子物理学的首要目标。将希格斯粒子作为某种强耦合新动力学的束缚态是一种很有吸引力的可能性，在过去的十年中已经引起了大量的理论工作，并且实验上也正在积极寻找这种可能性。这尤其被称为“复合希格斯粒子”。当宇宙冷却时，这种理论中的限制-解除限制过程很可能会经历一级相变。这种转变将发生在 TeV 尺度，并可能产生引力波的随机背景，可以通过天基引力波干涉仪进行搜索，例如 LISA（将于 2030 年代发射）。该项目将利用全息技术研究相变复合希格斯装置，其中 4D 强耦合模型由 5D 理论描述 包括重力。目的是了解此类转变的主要热力学量，例如潜热、气泡壁特性和成核速率。这足以预测这种模型的引力波信号。与此同时，我们的目标是将相变与大型强子对撞机研究联系起来。