The emergence of the $r=0$ singularity inside a spherically symmetric charged black hole is studied numerically within the Einstein-Maxwell-real scalar model. When the scalar field reaches a critical strength, the $r=0$ singularity emerges inside the black hole at the tip of the causal diamond. By varying the parameter $p$ of the initial profile for the scalar field toward the critical value $p_{*}$, we observe the areal radius at the tip follows a power-law scaling, $r_S\propto |p-p_{*}{|}^{\gamma }$, with a universal critical exponent $\gamma \approx 0.5$. This remarkable discovery, analogous to Choptuik’s critical phenomena for the black hole formation, provides the first evidence of the universality and scaling for the emergence of the $r=0$ singularity inside spherically symmetric charged black holes, offering new insights into the nonlinear dynamics of strong gravitational fields.

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• Classical black holes
• General relativity
• Gravitation
• Singularities In general relativity
• Numerical simulations in gravitation & astrophysics