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Entropy units11/23/2023 ![]() ![]() Thus it is reasonable that the black hole entropy should be a monotonic function of area, and it turns out to be simplest such function. This increasing behavior is reminiscent of thermodynamic entropy of closed systems. Standard entropies for a few substances are shown in the table below. One way to understand why is to recall the "area theorem" (Hawking 1971, Misner, Thorne and Wheeler 1973): the event horizon area of a black hole cannot decrease it increases in most transformations of the black hole. The symbol for entropy is S and the standard entropy of a substance is given by the symbol So, indicating that the standard entropy is determined under standard conditions. It turns out that these three parameters enter only in the same combination as that which represents the surface area of the black hole. Abstract: For acoustic modeling, the use of DNN has become popular due to its superior. How to express the black hole entropy in a concrete formula? It is clear at the outset that black hole entropy should only depend on the observable properties of the black hole: mass, electric charge and angular momentum. Entropy-based pruning of hidden units to reduce DNN parameters. Hence it makes sense to attribute entropy to a black hole. In ordinary physics entropy is a measure of missing information. Thus a black hole can be said to hide information. By blocking all signal travel through it, the event horizon prevents an external observer from receiving information about the black hole (save for the mentioned few parameters see Figure 2).Thus by analogy one needs to associate entropy with a black hole. Thermodynamic entropy quantifies the said multiplicity. In thermodynamics one meets a similar situation: many internal microstates of a system are all compatible with the one observed (macro)state. ![]() Thus there are many possible internal states corresponding to that black hole. For any specific choice of these parameters one can imagine many scenarios for the black hole's formation.
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