Liouville方程的八类精确解

利用Poisson括号的正则不变性求得了Liouville方程的八类精确解:1)“重力”势系统,2)谐振系统,3)正负平方幂函数势系统,4)双曲函数势系统,5)三角函数势系统,6)PschlTeller势系统,7)“引(斥)力”势系统和8)Kratzer势系统.得到了“化动量正则变换”的一般方法.在求解后两个系统Liouville方程的过程中还应用了Routh方法和Binet方法. 关键词：     

超拟共形变换的Beltrami代数

本文构造了一种与超拟共形变换相联系的代数, 即超Beltrami代数.该代数包含两个超共形(N S R ) 代数作为子代数. 关键词：     

c＝3，N＝2超共形场论的Z2 0rbifold—Prime模型

讨论了二维环面上中心荷c＝3，N＝2的超共形场论。特别给出该理论的配分函数，进一步，为了产生新的模型，回顾了一般的orbifold方法，然后构造了模不变的Z2 0rbifold—Prime模型。     

c=3, N=2 超共形场论的Z2 Orbifold-Prime模型

讨论了二维环面上中心荷c=3, N=2 的超共形场论. 特别给出该理论的配分函数. 进一步,为了产生新的模型,回顾了一般的orbifold方法. 然后构造了模不变的Z2 Orbifold-Prime模型.     

两维量子引力中的一种可解模型

通过标量物质场的引入研究了两维量子引力中波函数的可解性,并考虑了两维超引力模型中的类似问题.     

高维量子可积系统的精确解

量子多体问题或量子场论中有一类模型是可以精确求解的,这类模型称作量子可积模型.量子可积模型的主要特征是:系统的守恒量数目与系统自由度的数目相同(对于具有无限自由度的系统,守恒量的数目亦为无限),从而使系统的本征态、本征能谱及热力学量都可精确求得.自从1931年Bethe～[1]首次求得一维Heisenberg链的精确解后,许多一维量子多体物理模型或(1+1)维(一维空间加一维时间)量子场论模型都获得了精确解.这些精确解曾对于人们理解许多物理现象(如稀磁合金中的Kondo效应)起到了极为重要的作用.如何将这方面的理论推广到高维空间,即寻找并精…     

基于曲面基底偏振复用超表面的全息和隐身技术

共形超表面可以打破几何形状与光学功能之间的限制,可以显著改善任意曲面物体的光学特性,进而将超表面功能拓展到具有任意形状的组件中。当前尚未报道将偏振复用技术运用到共形超表面从而实现多偏振通道的多功能设计。文章设计了一种曲面基底的偏振复用超表面,基于传输相位调制原理设计了共形超表面的单元结构,使得超表面对不同偏振状态的入射光实现不同的相位调制,例如实现曲面全息和光学隐身等功能。这种共形超表面设计灵活性强,可以嵌入到各种非平面系统实现多功能,在军事安全、可穿戴电子设备等领域具有广泛应用前景。     

osp（1│4）Toda模型解的构造

将Ｌｅｚｎｏｖ－Ｓａｖｅｌｉｅｖ代数分析和Ｄｒｉｎｆｅｌｄ－Ｓｏｋｏｌｏｖ构造这种方法地称情形,并运用这种方法给出ｏｓｐ（１│４）Ｔｏｄａ模型的解,从而将这种方法推广到二秩情况。     

从可积条件到共形对称:玻色超共形Toda模型

本文研究从WZNW模型的二阶共形约化得到的新模型—玻色超共形Toda模型.从约化过程得出了模型的运动方程及Lax pair线性方程组,进而在主阶化的特殊情形下求出了r矩阵、基本Poisson关系.手征交换代数以及经典顶角算子.     

Noninvariant zeta-function regularization in quantum Liouville theory

We consider two possible zeta-function regularization schemes of quantum Liouville theory. One refers to the Laplace–Beltrami operator covariant under conformal transformations, the other to the naive noninvariant operator. The first produces an invariant regularization which however does not give rise to a theory invariant under the full conformal group. The other is equivalent to the regularization proposed by A.B. Zamolodchikov and Al.B. Zamolodchikov and gives rise to a theory invariant under the full conformal group.     

Entanglement Renyi Entropy of Two Disjoint Intervals for Large c Liouville Field Theory

Entanglement entropy (EE) is a quantitative measure of the effective degrees of freedom and the correlation between the sub-systems of a physical system. Using the replica trick, we can obtain the EE by evaluating the entanglement Renyi entropy (ERE). The ERE is a q-analogue of the EE and expressed by the q replicated partition function. In the semi-classical approximation, it is apparently easy to calculate the EE because the classical action represents the partition function by the saddle point approximation and we do not need to perform the path integral for the evaluation of the partition function. In previous studies, it has been assumed that only the minimal-valued saddle point contributes to the EE. In this paper, we propose that all the saddle points contribute comparably but not necessarily equally to the EE by dealing carefully with the semi-classical limit and then the q→1 limit. For example, we numerically evaluate the ERE of two disjoint intervals for the large c Liouville field theory with q∼1. We exploit the BPZ equation with the four twist operators, whose solution is given by the Heun function. We determine the ERE by tuning the behavior of the Heun function such that it becomes consistent with the geometry of the replica manifold. We find the same two saddle points as previous studies for q∼1 in the above system. Then, we provide the ERE for the large but finite c and the q∼1 in case that all the saddle points contribute comparably to the ERE. In particular, the ERE is the summation of these two saddle points by the same weight, due to the symmetry of the system. Based on this work, it shall be of interest to reconsider EE in other semi-classical physical systems with multiple saddle points.     

General Rotating Black Hole with Four Charges and Liouville Theory

By considering the dual Liouville theory emerging in the near-horizon limit, we study the thermodynamics of general rotating black hole with four charges in four dimensions. Both the black hole entropy and temperature are found to agree with the gravitational expectations. The relations between the new Liouville formalism and the anomaly approach are also discussed.     

General Rotating Black Hole with Four Charges and Liouville Theory

By considering the dual Liouville theory emerging in the near-horizon limit, we study the thermodynamics of general rotating black hole with four charges in four dimensions. Both the black hole entropy and temperature are found to agree with the gravitational expectations. The relations between the new Liouville formalism and the anomaly approach are also discussed.     

Eternal inflation with Liouville cosmology

We present a concrete holographic realization of the eternal inflation in (1+1)$(1+1)$-dimensional Liouville gravity by applying the philosophy of the FRW/CFT correspondence proposed by Freivogel, Sekino, Susskind and Yeh (FSSY). The dual boundary theory is nothing but the old matrix model describing the two-dimensional Liouville gravity coupled with minimal model matter fields. In Liouville gravity, the flat Minkowski space or even the AdS space will decay into the dS space, which is in stark contrast with higher-dimensional theories, but the spirit of the FSSY conjecture applies with only minimal modification. We investigate the classical geometry as well as some correlation functions to support our claim. We also study an analytic continuation to the time-like Liouville theory to discuss possible applications in (1+3)$(1+3)$-dimensional cosmology along with the original FSSY conjecture, where the boundary theory involves the time-like Liouville theory. We show that the decay rate in the (1+3)$(1+3)$ dimension is more suppressed due to the quantum gravity correction of the boundary theory.     

Exact and Numerical Solution of the Fractional Sturm–Liouville Problem with Neumann Boundary Conditions

In this paper, we study the fractional Sturm–Liouville problem with homogeneous Neumann boundary conditions. We transform the differential problem to an equivalent integral one on a suitable function space. Next, we discretize the integral fractional Sturm–Liouville problem and discuss the orthogonality of eigenvectors. Finally, we present the numerical results for the considered problem obtained by utilizing the midpoint rectangular rule.     

A New Lie Algebra and Its Related Liouville Integrable Hierarchies

A new Lie algebra G and its two types of loop algebras G1 and G2 are constructed. Basing on G1 and G2, two different isospectral problems are designed, furthermore, two Liouville integrable soliton hierarchies are obtained respectively under the framework of zero curvature equation, which is derived from the compatibility of the isospectral problems expressed by Hirota operators. At the same time, we obtain the Hamiltonian structure of the first hierarchy and the bi-Hamiltonian structure of the second one with the help of the quadratic-form identity.     

Generalizations of the Virasoro algebra and matrix Sturm–Liouville operators

We study the series of Lie algebras generalizing the Virasoro algebra introduced in [V. Yu, Ovsienko, C. Roger, Functional Anal. Appl. 30 (4) (1996)]. We show that the coadjoint representation of each of these Lie algebras has a natural geometrical interpretation by matrix differential operators generalizing the Sturm–Liouville operators.     

Multifractality in Uniform Hyperbolic Lattices and in Quasi-Classical Liouville Field Theory

We introduce a deterministic model defined on a two dimensional hyperbolic lattice. This model provides an example of a non random system whose multifractal behaviour has a number theoretic origin. We determine the multifractal exponents, discuss the termination of multifractality and conjecture the geometric origin of the multifractal behavior in Liouville quasi-classical field theory.     

A New Lie Algebra and Its Related Liouville Integrable Hierarchies

A new Lie algebra G and its two types of loop algebras \tilde{G₁} and \tilde{G₂} are constructed. Basing on \tilde{G₁} and \tilde{G₂}, two different isospectral problems are designed, furthermore, two Liouville integrable soliton hierarchies are obtained respectively under the framework of zero curvature equation, which is derived from the compatibility of the isospectral problems expressed by Hirota operators. At the same time, we obtain the Hamiltonian structure of the first hierarchy and the bi-Hamiltonian structure of the second one with the help of the quadratic-form identity.