Physical singularity in the regular spacetime and fundamental length
Abstract
It is shown that formally regular solutions in 5D Kaluza-Klein gravity have singularities. This phenomenon is connected with the existence of a minimal length in nature. The calculation of the derivative of the G55 metric component leads to the appearance of the Dirac's δ-function. In this case the Ricci scalar becomes singular since there is a square of this derivative.
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