![]() 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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