Non-singular Kruskal-like coordinates of some black holes space-times in f (R) gravity are presented in this research paper, and are also removed by establishing Kruskal-Szekeres coordinates for Non-extremal case. Carter-like coordinates can also be built for its extreme case.

中文翻译：

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f（R）引力中某些黑洞的非奇异坐标

本文介绍了一些黑洞时空在f（R）引力下的非奇异Kruskal样坐标，并且通过为非极端情况建立Kruskal-Szekeres坐标将其删除。类似卡特的坐标也可以为其极端情况构建。