Tsallis-Cirto entropy of black hole and black hole atomThe application of the non-extensive Tsallis-Cirto $δ$-entropy with $δ=2$ to the black hole suggests that the mass spectrum of the black hole is equidistant, $M=NM_0$. Here $N$ is an integer number and $M_0=\sqrt{2}m_{\rm P}$ is the mass quantum expressed via the reduced Planck mass $m_{\rm P}$. The Bekenstein-Hawking entropy of the black hole with mass $M=NM_0$ is $S_{\rm BH}(N)=N^2$.
arxiv.org 
