Vaidya时空中的引力坍缩
Gravitational Collapse In Vaidya Space-time For Galileon Gravity Theory
摘要：
本工作的目的是研究嵌入伽利略引力理论的Vaidya时空中的引力坍缩。伽利略引力实际上是爱因斯坦引力的红外修正，它是DGP膜模型中四维有效理论的推广。Vaidya的度量是用来遵循未来外向径向零测地线的性质。基本目标是通过奇点过去发射的未来有向径向零测地线的存在来检测中心奇点是裸露的还是被事件视界包裹的。为了指出正轨线切线解的存在性，应用了特殊的参数情况（通过表格形式）和大范围的轮廓处理。准确地说，理想流体中的初始态满足了一系列广泛的现象：从尘埃到像暗能量这样的外来流体。我们用EoS参数$k$确定了不同宇宙学年代的最终坍缩态。
英文摘要：
The motive of this work is to study gravitational collapse in Vaidya space-time embedded in Galileon gravity theory. Galileon gravity is in fact an infrared modification of Einstein gravity, which was proposed as a generalization of the 4D effective theory in DGP brane model. Vaidya's metric is used all over to follow the nature of future outgoing radial null geodesics. Detecting whether the central singularity is naked or wrapped by an event horizon, by the existence of future directed radial null geodesic emitted in past from the singularity is the basic objective. To point out the existence of positive trajectory tangent solution, both particular parametric cases (through tabular forms) and wide range contouring process have been applied. Precisely, the EoS in perfect fluid satisfies a wide range of phenomena: from dust to exotic fluid like dark energy. We have used the EoS parameter $k$ to determine the end collapse state in different cosmological era.
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