In his work on the holographic bound, Susskind considered any approximately spherical isolated mass that is not itself a black hole and that fits inside a closed surface of area A.
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- 色斯金在全像熵上限的研究中,考虑了任何约略为球形、但本身不是黑洞的孤立质量,同时此质量可以放进面积为A的封闭曲面里。