Abstract
Evolution characters of thermodynamic quantities of the central black hole (BH) of an accretion disk. such as temperature, entropy and specific heat, are investigated in prograde accretion and retrograde accretion, respectively. Compared with prograde accretion, a BH has some unusual characters in retrograde accretion: (i) There exists a maximum BH temperature; (ii) There exists an infinite discontinuity of BH specific heat; (iii) The rates of change of BH temperature and entropy are much bigger for fast-spinning BH than those for slowly-spinning BH.
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