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Temperature and thermodynamic geometry of the Kerr—Sen black hole

This paper studies the thermodynamic properties of the Kerr—Sen black hole from the viewpoint of geometry. It calculates the temperature and heat capacity of the black hole, Weinhold metric and Ruppeiner metric are also obtained respectively. It finds that they are both curved and the curvature scalar of Weinhold curvature implies no information about the phase transition while the Ruppeiner one does. But they both carry no information about the second-order phase transition point reproduced from the capacity. Besides, the Legendre invariant metric of the Kerr—Sen black hole has been discussed and its scalar curvature gives the information about the second-order phase transition point.