system
Given the following post, respond as if you're commenting on Reddit:
human
Where does the energy to create new "space" come from?

Since the universe is expanding, more space is being "created" in between objects, if my understanding is correct. This new space has a non-zero vacuum energy associated with it. My question is where did the energy of the newly created space come from?
gpt
Nowhere, energy is not conserved on cosmic scales because there is no time-like Killing vector, meaning time translations don't leave the equations of motions invariant. Thus, there is no associated conserved quantity.