Collapsing process is studied in special type of inhomogeneous spherically symmetric space-time model (known as IFRW model), having no time-like Killing vector field. The matter field for collapse dynamics is considered to be perfect fluid with anisotropic pressure. The main issue of this investigation is to examine whether the end state of the collapse to be a naked singularity or a black hole. Finally, null geodesics is studied near the singularity.

中文翻译：

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非均匀 FRW 模型中的折叠几何

坍缩过程是在特殊类型的非均匀球对称时空模型（称为IFRW模型）中研究的，没有类时Killing向量场。坍缩动力学的物质场被认为是具有各向异性压力的完美流体。本次调查的主要问题是检查坍缩的最终状态是裸奇点还是黑洞。最后，研究了奇点附近的零测地线。