The extended uncertainty principle inspires the Rényi entropy

¹ Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), University of Maragheh P.O. Box 55136-553, Maragheh, Iran
² International Institute for Applicable Mathematics and Information Sciences, B. M. Birla Science Centre Adarshnagar, Hyderabad 500063, India

^(a) h.moradpour@riaam.ac.ir
^(b) cordac.galilei@gmail.com
^(c) ah.ziaie@riaam.ac.ir
^(d) sh.ghaffari@riaam.ac.ir

Received: 1 August 2019
Accepted: 30 September 2019

Abstract

We use the extended uncertainty principle (EUP) in order to obtain the Rényi entropy for a black hole (BH). The result implies that the non-extensivity parameter, appearing in the Rényi entropy formalism, may be evaluated from the considerations which lead to EUP. It is also shown that, for excited BHs, the Rényi entropy is a function of the BH principal quantum number, i.e., the BH quantum excited state. Temperature and heat capacity of the excited BHs are also investigated addressing two phases while only one of them can be stable. In this situation, whereas entropy is vanishing, temperature may take a non-zero positive minimum value, depending on the value of the non-extensivity parameter. The evaporation time of excited BH has also been studied.