A polynomial Plebański structural function H(P) enables the first realization of multicritical points in 4D GR, with the soliton sector exhibiting multiple first-order phase transitions whose number is set by the polynomial degree.
Ayón-Beato, Annals Phys
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Multicritical points of gravitational solitons and a black hole in four dimensions
A polynomial Plebański structural function H(P) enables the first realization of multicritical points in 4D GR, with the soliton sector exhibiting multiple first-order phase transitions whose number is set by the polynomial degree.