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In general relativity, a black brane is a solution of the equations that generalizes a black hole solution but it is also extended—and translationally symmetric—in ''p'' additional spatial dimensions. That type of solution would be called a black ''p''-brane. (http://ncatlab.org/nlab/show/black+brane) In string theory, the solutions labeled as black branes provide us with an alternative description of the same objects called p-branes. Other descriptions of the same objects include D-branes. Some approximations of black branes might lead to entropy consistent with energy, from E=mc2. The metric for a black p-brane in a n-dimensional space-time is: : where: *''η'' is the (p+1)-Minkowski metric with signature (-,+,+,+,...), *''σ'' are the coordinates for the worldsheet of the black p-brane, *''u'' is its four-velocity, *''r'' is the radial coordinate and, *''Ω'' is the metric for a (n-p-2)-sphere, surrounding the brane. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「black brane」の詳細全文を読む スポンサード リンク
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