Naked Singularity in the Sultana-Dyer Space-Time - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: How to describe a black hole embedded in an expanding universe is animportant topic. Some models about this issue are suggested by assuming thatthe metric is a conformal transformation of the Schwarzschild metric or of theisotropic black hole metric. However, there exists naked singularities in thetwo metrics. Recently, it is argued that the singularity in the Sultana-Dyerspace-time is covered by an apparent horizon surface. But we find that such anapparent horizon does not exist if the null energy condition holds.



Author: Cheng-Yi Sun

Source: https://arxiv.org/



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