Nonthermal nature of extremal Kerr black holes
نویسنده
چکیده
Liberati, Rothman and Sonego have recently showed that objects collapsing into extremal Reissner-Nordström black holes do not behave as thermal objects at any time in their history. In particular, a temperature, and hence thermodynamic entropy, are undefined for them. I demonstrate that the analysis goes through essentially unchanged for bodies collapsing into extremal Kerr black holes. PACS: 04.62.+v, 04.70.Dy, 04.20.Dw
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