Pure $T\bar{T}$ deformations of conformal field theories are generally asymptotically incomplete in the ultra-violet (UV) due to square-root singularities in the ground state energy on a cylinder of circumference $R$, such that the theory is ill-defined for distances shorter than some critical $R_*$. In this article we show how a theory can be completed if one includes an infinite number of additional irrelevant perturbations. This is fully demonstrated in the case of the Ising model at $c_{IR}= 1/2$ in the infra-red (IR), where we find two completions with central charges $c_{UV} = 3/2$ and $c_{UV} = 7/10$, the latter being the tri-critical Ising model. Both of these UV completions have ${\cal N}=1$ supersymmetry which is broken in the renormalization group flow to low energies. We also consider multiple $T\bar{T}$ deformations of a free massless boson, where we cannot find a UV completion that is consistent with the c-theorem. For negative coupling $g$, which violates the c-theorem, in both cases we find $c_{UV} = -c_{IR}$ as $g \to -\infty$. Finally we also study pure $T\bar{T}$ deformations of the off-critical Ising model.
Ultraviolet Completion of the Big Bang in Quadratic Gravity
University of Waterloo(滑铁卢大学);Perimeter Institute for Theoretical Physics(珀米特理论物理研究所);Waterloo Centre for Astrophysics, University of Waterloo(滑铁卢大学天体物理中心);École de technologie supérieure, Université du Québec(魁北克理工大学);McGill University(麦吉尔大学)
Institute for Advanced Study(高等研究院);Sorbonne Université, CNRS(索邦大学,法国国家科学研究中心);Scuola Normale Superiore and INFN(比萨高等师范学院和意大利国家核物理研究所);Academy of Athens, Division of Natural Sciences(雅典科学院自然科学部);Texas A&M University(德克萨斯农工大学)
Roaming form factors for the tricritical to critical Ising flow
本文研究了由Al. B. Zamolodchikov通过解析延拓的sinh-Gordon S-矩阵,侧重于重整化群流从三临界到临界伊辛模型。我们表明,适当定义的某些sinh-戈登形状因子的漫游限制是相同的形状因子的顺序和无序运营商的无质量流。作为一个副产品,我们还构造了一个半局域场的sinh-Gordon模型,它可以与紫外限制自由无质量玻色子理论中的扭曲场的形状因子。
Ultraviolet Completions of Axigluon Models and Their Phenomenological Consequences
CDF和D 0的合作已经观察到在大的不变质量下t-tbar产生的前后不对称性超过了标准模型的预测。一种解释涉及到一种重色八隅体粒子,它与夸克(轴胶子)具有轴向矢量耦合。我们从弦激发的场论的观点和从局部IIa型相交膜结构的解析分析两个方面描述和对比了从手征SU(3)_L x SU(3)_R规范理论破缺得到的轴胶子的各个方面。特别注意的是额外的限制和问题,从这些类的自上而下的建设相比,更常见的有效场论的方法。这些包括大尺度微扰连接的含义; Yukawa耦合,在许多构造中必须由高维算子产生;异常抵消,特别是所需的奇异项对轴胶子宽度、微扰性和奇异衰变的影响;通过镜像表示、与奇异项混合或附加SU(3)因子实现族非普适性的可能性;弦结构中反常U(1)因子的额外约束;蝌蚪相消,这意味着新的无色物质;防止矢量对的弦尺度质量;以及涉及FCNC、CKM约束和轴胶子耦合强度的各种唯象问题。它的结论是,建设可行的轴胶子模型从IIa型或类似的结构是有问题的,需要相当大的微调,但并不完全排除。这些考虑说明了自上而下的约束对可能的TeV尺度物理学的重要性,而不依赖于对t-tbar不对称性的最终解释。
Quark and lepton mixing in the asymptotically safe Standard Model
Heidelberg University(海德堡大学);Institut de Physique Théorique Philippe Meyer, Laboratoire de Physique de l’École normale supérieure (ENS), Université PSL, CNRS, Sorbonne Université, Université Paris Cité(菲利普·迈耶理论物理研究所,巴黎高等师范学院(ENS)物理实验室,PSL大学,法国国家科学研究中心,索邦大学,巴黎西岱大学)