Phase transitions in strongly coupled extensions of the Standard Model

在2012年LHC发现希格斯玻色子之后，理解电弱尺度的起源仍然是粒子物理学的主要目标。把Higgs阿萨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10年里，这一可能性引起了大量的理论研究，同时也在实验上得到了积极的探索。这一理论特别被称为“复合希格斯粒子”。在这种理论中，当宇宙冷却下来时，禁闭-解除禁闭的过程很可能经历一级相变。这种相变将发生在TeV尺度上，并可能产生随机的引力波背景，这可以通过天基引力波干涉仪来搜索，例如丽莎（将于2030年代发射）。该项目将通过使用全息技术来研究相变复合希格斯类设置，其中4D强耦合模型由包括引力的5D理论描述。目的是了解这种转变的主要物理量，如潜热、泡壁性质和成核速率。这将足以预测这种苏查模型的引力波信号。与此同时，我们将致力于将相变与LHC研究相结合。

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.