Vaidya-Schwarzschild-de Sitter黑洞的Hawking效应

本文给出了Vaidya-Schwarzschild-de Sitter时空中,Klein-Gordon方程在黑洞视界和宇宙视界附近的渐近解,并且准确地定出了蒸发黑洞事件视界和宇宙视界的位置以及Hawking辐射温度.     

准静态蒸发Kerr黑洞的量子热效应

该文采用新的广义乌龟坐标变换后,在事件视界附近直接求解Klein-Gordon方程,得到以(t,r)坐标描述的轴对称Kerr黑洞的视界位置、辐射温度.计算结果表明,考虑蒸发后Kerr黑洞的视界面是一个随时间变化的椭球面,Hawking辐射温度不仅随时间变化,而且与方位角有关.进一步分析表明Hawking辐射温度是时间坐标尺度下的补偿效应.     

球对称带电时空中Dirac粒子的Hawking效应

该文避开求解能－动张量的困难，在视界附近直接求解Ｄｉｒａｃ方程，得到球对称带电黑洞的事件视界位置和Ｈａｗｋｉｎｇ辐射温度．进一步分析表明Ｈａｗｋｉｎｇ辐射温度是时间坐标尺度变换下的补偿效应．     

确定球对称动态时空与平面对称动态时空Hawking效应的普适方法

本文建议了一种普遍适用的研究动态球对称或动态平面对称时空中Hawking效应的新方法,并给出其理论依据.在广义乌龟坐标交换下,Klein-Gordon方程在视界附近一定会化成波动方程的标准形式,从而自动得出决定事件视界位置的方程及Hawking辐射温度.在弱辐射情况下,其结果的一级近似与考虑辐射反作用得到的近似结果完全一致.     

一般动态黑洞的热辐射

本文讨论了最一般动态黑洞的热辐射,给出了确定视界位置和温度函数的普遍关系。     

准静态蒸发带电黑洞的量子热效应

把对动态黑洞量子热效应的研究推广到用(t，r)坐标描述的时空.采用了既不同于稳态又不同于以超前Eddington坐标v描述的动态时空的乌龟坐标方程.在考虑Hawking蒸发影响的情况下,得到了黑洞的温度、视界位置.进一步分析表明Hawking辐射温度是坐标尺度变换下的补偿效应.     

轴对称Einstein-Maxwell-Dilaton-Axion黑洞熵与能斯特定理

该文利用Ｂｒｉｃｋ Ｗａｌｌ方法，计算轴对称Ｅｉｎｓｔｅｉｎ Ｍａｘｗｅｌｌ Ｄｉｌａｔｏｎ Ａｘｉｏｎ 黑洞背景下标量场的自由能和熵．结果表明，当黑洞具有内外视界时，所得熵不仅与外视界面积有关，而且也是内视界面积的函数．当内视界面积于零时，可回到已知结论．并且表明，用内外视界位置参量表达的熵，在黑洞辐射温度趋于绝对零度时，黑洞的熵也趋于零，它满足能斯特定理，可视为黑洞的普朗克绝对熵．     

一类Weyi型单李超代数

本文研究了单李超代数的构造理论.借助于张量积方法,定义了一类Weyl型结合超代数和一类Weyl型李超代数,并且证明了这类Weyl型结合超代数和Weyl型李超代数是单的充分必要条件.     

具转移条件奇型Sturm-Liouville算子相关的Weyl函数

研究了一端奇异且在内部具有转移条件的Sturm-Liouville算子的Weyl函数,我们给出了相应的Weyl函数的定义,并对Weyl函数性质进行了讨论.     

自旋场对Barriola-Vilenkin黑洞熵的量子修正

用砖墙模型的方法，讨论了无源电磁、中微子场对Barriola Vilenkin黑洞熵的量子修正。计算表明，量子修正应该包含两部分：其中一部分与视界面积成正比，在视界附近与紫外截断因子∈是平方反比发散的；另一部分是两个对数发散项，这部分除了与黑洞的本身特征性质有关以外，还与自旋场的自旋有关。结果与标量场引起的量子修正具有完全不同的形式。      

Neutrino emission from a one-dimensional hydrogen-like atom

We find the probability and intensity of the neutrino emission from a hydrogen-like atom in a strong magnetic field. We analyze the dependence of the neutrino emission intensity on the temperature of the ensemble of atoms.     

一个静态Gutsunaev—Manko黑洞视界温度的计算方法

计算出了一个新的静态Gutsunaev-Manko黑洞的视界温度，其结果表明，此黑洞存在热辐射，除了内禀奇点所在处之外，视界温度是常数，黑洞质量多极矩的存在将对内禀奇点处的视界温度产生很大影响．     

Special Green’s function boundary element approach for steady-state axisymmetric heat conduction across low and high conducting planar interfaces

The problem of determining the steady-state axisymmetric temperature distribution in a bimaterial with a planar interface is considered here. The interface is either low or high conducting. Special Green’s functions satisfying the thermal conditions on the interface are derived and employed to obtain boundary integral equations whose path of integration does not include the interface. Boundary element procedures that do not require the interface to be discretized into elements are proposed for solving the problem under consideration.     

On Weyl structures

We characterize the relation between the geometrical properties of Weyl manifolds and the algebraic properties of the Weyl algebras (§1) and the deformation algebras associated to two conformal Weyl connections (§2). The last section is devoted to the study of the Weyl-Lyra algebras associated to a conformal Weyl connection and a conformal semisymmetric connection.     

Submanifolds of Weyl Flat Manifolds

 We consider compact Weyl submanifolds of Weyl flat manifolds with special attention on compact Einstein-Weyl hypersurfaces. In particular, in the last part of the paper, we study Weyl submanifolds of special noncompact manifolds, called PC-manifolds.     

Global Weyl modules for the twisted loop algebra

We define global Weyl modules for twisted loop algebras and analyze their highest weight spaces, which are in fact isomorphic to Laurent polynomial rings in finitely many variables. We are able to show that the global Weyl module is a free module of finite rank over these rings. Furthermore we prove, that there exist injective maps from the global Weyl modules for twisted loop algebras into a direct sum of global Weyl modules for untwisted loop algebras. Relations between local Weyl modules for twisted and untwisted generalized current algebras are known; we provide for the first time a relation on global Weyl modules.     

Weyl composition of symbols in large dimension

This paper is concerned with the Weyl composition of symbols in large dimension. We specify a class of symbols in order to estimate the Weyl symbol of the product of two Weyl h-pseudodifferential operators, with constants independent of the dimension. The proof includes regularized and hybrid compositions, together with a decomposition formula. We also analyze, in this context, the remainder term of the semiclassical expansion of the Weyl composition. The class of symbols contains symbols of Schrödinger semigroups in large dimension, typically for nearest neighbors or mean field interaction potentials. The Weyl composition is applied with Kac operators.     

Spectral Multiplicity of Selfadjoint Schrödinger Operators on Star-Graphs with Standard Interface Conditions

We analyze the singular spectrum of selfadjoint operators which arise from pasting a finite number of boundary relations with a standard interface condition. A model example for this situation is a Schrödinger operator on a star-shaped graph with continuity and Kirchhoff conditions at the interior vertex. We compute the multiplicity of the singular spectrum in terms of the spectral measures of the Weyl functions associated with the single (independently considered) boundary relations. This result is a generalization and refinement of a Theorem of I.S.Kac.     

Homogeneous Einstein–Weyl Structures on Symmetric Spaces

In this paper we examine homogeneous Einstein–Weyl structures and classify them on compact irreducible symmetric spaces. We find that the invariant Einstein–Weyl equation is very restrictive: Einstein–Weyl structures occur only on those spaces for which the isotropy representation has a trivial component, for example, the total space of a circle bundle.