Critical Phenomenon inside Asymptotically Flat Black Holes with Spontaneous Scalarization
Abstract
We study the nonlinear interior dynamics of spontaneously scalarized black holes in Einstein-Maxwell-scalar theory with zero cosmological constant, revealing novel critical phenomena. We demonstrate that, for a wide range of scalar-electromagnetic couplings, scalarized black holes possess no smooth inner Cauchy horizon and instead evolve into a spacelike Kasner singularity. The scalar hair triggers a rapid collapse of the Einstein-Rosen bridge at the would-be Cauchy horizon. Near the critical point where scalarized black holes bifurcate from the Reissner-Nordström solution, we establish a robust scaling relation between the Kasner exponent and the charge-to-mass ratio of the hairy black hole, opening a new window into the remarkable simplicity underlying black hole interiors.
Fields of Study & Subjects
Black Holes and Theoretical Physics
Cosmology and Gravitation Theories
Quantum Electrodynamics and Casimir Effect
Publication details
- Journal / source
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Volume
- 136
- Issue
- 25
- Pages
- 251402–251402
- Publication date
- 20 May 2026
- Language
- EN