Phase transitions in strongly coupled extensions of the Standard Model

2012年在大型强子对撞机上发现希格斯玻色子后，理解弱电标度的起源仍然是粒子物理学的主要目标。将Higgs作为某些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，这一可能性已经上升到大量的理论工作，并在实验上积极寻找。特别是在“复合希格斯”的名义下，这种理论中的禁闭-解禁闭过程很有可能在宇宙冷却时通过一级相变进行。这样的变换将发生在TeV尺度上，并可能产生随机的引力波背景，可以用空间引力波干涉仪来搜索，比如LISA(将于本世纪30年代发射)。该项目将利用全息术技术研究复合希格斯装置的相变，其中4D强耦合模型由包括重力的5D理论描述。目的是了解这种转变的主要热力学参数，如潜热、气泡壁性质和成核率。这将足以预测这种模型的引力波信号。同时，我们将致力于将相变与大型强子对撞机的研究联系起来。

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.