On Thermodynamics of Charged and Rotating Asymptotically AdS Black Strings

Figure 1

Plots of the heat capacity at constant 𝑉 and 𝑄 versus the 𝑟⁴₊. The horizontal axis started from 4/3, because of 𝑇>0. The intersection point of 𝐶_𝑉,𝑄 with the horizontal axis is 20/3, which shows that when 𝑟⁴₊>(20/3)𝑄²𝑙⁴ holds up, 𝐶_𝑉,𝑄>0.