标题： 非紧致带电物体的奇点 显示英文标题

标题： Singularities of Noncompact Charged Objects

摘要： 我们在非对易场论的框架下提出了非紧球形带电物体的模型。 爱因斯坦-麦克斯韦场方程通过带电各向异性流体得到求解。 我们选择了属于密度分布函数双参数族的质量和电荷密度形式，而不是作为高斯宽度长度的密度。 发现相应的密度和里奇标量在原点处是奇异的，而度规是非奇异的，表明存在类空奇点。 视界方程的数值解表明，根据质量的不同，可能存在两个、一个或没有视界。 我们还计算了霍金温度，这表明具有两个视界的黑洞会蒸发成具有一个视界的极端黑洞。 显示英文摘要

摘要： We formulate a model of noncompact spherical charged objects in the framework of noncommutative field theory. The Einstein-Maxwell field equations are solved with charged anisotropic fluid. We choose the forms of mass and charge densities which belong to two parameter family of density distribution functions instead of densities as Gaussian width length. It is found that the corresponding densities and the Ricci scalar are singular at origin whereas the metric is nonsingular indicating a spacelike singularity. The numerical solution of the horizon equation implies that there are either two or one or no horizon depending on the mass. We also evaluate the Hawking temperature which implies that a black hole with two horizons is evaporated to an extremal black hole with one horizon.