Geometric Curvatures of Plane Symmetry Black Hole

Figure 5

The negative unified geometric curvature ℛ_𝐿 versus the charge 𝑄 with 𝑁=1, 𝛼=√3/3, and 𝑆=100. The divergence points are at 𝑄=±11.5470, which are consistent with the divergence points of the heat capacity 𝐶_𝑄. The positive curvature region is at |𝑄|≥20 and it is not shown in this figure.