"Space is expanding" is not correct. Google "metric expansion" for a discussion.kodama said:universe is expanding since the bigbang so therefore space is expanding, but apparently dark energy remains constant, it apparently isn't getting diluted as the universe expands
is energy being created, specifically the energy in vacuum?
phinds said:Yes, dark energy is being created as bound systems get farther apart from each other. The density of dark energy remains the same.
My references are all just other posts (by knowledgeable people) here on this forum. It is not an assumption, it is taken as empirically-based fact but I can't point you to a study saying so. I don't mean to imply that there aren't any, just that I don't have a citation for you.no-ir said:Hm, do you know of any experimental evidence that dark energy density is constant in time, or is this just an assumption? Specifically, do you have any reason to believe that the average dark energy density is not inversely proportional to the "total volume"; i.e. that the "total dark energy content" is not constant after all?
What do you mean by this? Isn't spacetime defined by a manifold with a metric on it? :)phinds said:"Space is expanding" is not correct.
Google "metric expansion"haushofer said:What do you mean by this? Isn't spacetime defined by a manifold with a metric on it? :)