# Does the universe have a predetermined final entropy? [closed]

Assuming you believe in the heat death of the universe, that is, its entropy will, in finite time, reach a maximum (as a function of time). Let's consider a chain of events $\mathcal C_1$ starting now with the Universe in its current state, leading up to that heat death and leaving the universe with a final entropy $S(\mathcal C_1)$. Mathematically speaking, $S$ is a function which maps a chain of events to the subconsequent final entropy of the universe, regardless of when it is reached. Would a different chain of events $\mathcal C_2$ (also starting now) lead to a different value of $S$, that is $S(\mathcal C_1) \neq S(\mathcal C_2)$ ? Otherwise formulated, does the value of that final entropy depend on what goes on in the meantime ? Can I alter it by creating entropy ? Or on the contrary, is the entropy of the Universe at its heat death computable given enough information on its current state ?

• By definition of "maximum entropy", everything you do can only bring you closer to the maximum, but not above it. Feb 13 '18 at 7:31
• Ok, I will edit this, I mean "maximum" with respect to time, not with respect to events that occur. Maybe I should use "final" instead. Feb 13 '18 at 15:28
• The question doesn't make sense. An event is by definition a point in spacetime. Therefore it doesn't make sense to talk about the entropy of the universe as a function of an event.
– user4552
Feb 15 '18 at 2:26
• How would you formulate it ? Feb 17 '18 at 23:17
• Maybe you can rephrase the following way: Does the entropy of our universe at its heat death depend on the history of the universe from now until the heat death? Feb 22 '18 at 11:49