论文标题
二次Weyl共形性重力理论中的黑洞溶液
Black hole solutions in the quadratic Weyl conformal geometric theory of gravity
论文作者
论文摘要
我们考虑了Weyl共形几何形状中的数值黑洞溶液及其相关的共形不变二次重力。在此模型中,在Weyl仪表场($ω_μ$)通过Stueckelberg机制变得巨大,并在自发折断的Weyl重力相中回收了爱因斯坦重力(具有正宇宙常数),并将其脱离。作为调查的第一步,我们写下了包含标量自由度和Weyl载体的共形性重力作用。在没有物质的情况下,场方程源自变化原理。通过采用静态的球形对称几何形状,可以获得引力,标量和Weyl场的真空场方程。在以无量纲形式重新构造场方程并通过引入合适的独立径向坐标后,我们以数字获得其解决方案。我们从公制张量组件中的静态杀伤载体的存在中检测到一个黑洞的形成,表明公制中存在奇异性。考虑了几种对应于Weyl载体不同功能形式的模型。还获得了与仅具有径向空隙分量的Weyl载体相对应的精确黑洞模型。还详细分析了Weyl几何型黑洞(地平线温度,特定的热量,熵和由于霍金亮度引起的蒸发时间)的热力学特性。
We consider numerical black hole solutions in the Weyl conformal geometry, and its associated conformally invariant Weyl quadratic gravity. In this model Einstein gravity (with a positive cosmological constant) is recovered in the spontaneously broken phase of Weyl gravity, after the Weyl gauge field ($ω_μ$) becomes massive through a Stueckelberg mechanism, and it decouples. As a first step in our investigations we write down the conformally invariant gravitational action, containing a scalar degree of freedom, and the Weyl vector. The field equations are derived from the variational principle in the absence of matter. By adopting a static spherically symmetric geometry, the vacuum field equations for the gravitational, scalar, and Weyl fields are obtained. After reformulating the field equations in a dimensionless form, and by introducing a suitable independent radial coordinate, we obtain their solutions numerically. We detect the formation of a black hole from the presence of a Killing horizon for the timelike Killing vector in the metric tensor components, indicating the existence of the singularity in the metric. Several models, corresponding to different functional forms of the Weyl vector, are considered. An exact black hole model, corresponding to a Weyl vector having only a radial spacelike component, is also obtained. The thermodynamic properties of the Weyl geometric type black holes (horizon temperature, specific heat, entropy and evaporation time due to Hawking luminosity) are also analyzed in detail.