Abstract
The relation between Kruskal and Schwarzschild coordinates is analogous to that between hyperboloid and de Sitter coordinates; the Kruskal diagram is analogous to the hyperboloid diagram; and the crossing over of horizons in Kruskal space is analogous to the well-known crossing over of the particle horizon and the event horizon in cosmology.
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References
P. G. Bergmann, “Gravitational Collapse,”Phys. Rev. Lett. 12, 139, (1964).
W. Rindler,Essential Relativity (Springer-Verlag, New York, 1977).
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Rindler, W. Analogies between Kruskal space and de Sitter space. Found Phys 15, 545–551 (1985). https://doi.org/10.1007/BF01882481
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DOI: https://doi.org/10.1007/BF01882481