For every action there is an equal and opposite reaction

[Greenlight]

TL;DR

is there an equal and opposite reaction to the expansion of the universe?

if the universe is expanding, what is the equal and opposite reaction to this action?

 

[phinds]

Summary: is there an equal and opposite reaction to the expansion of the universe?

No.

if the universe is expanding, what is the equal and opposite reaction to this action?

Since there isn't one, this part of your question is not meaningful.

The universe isn't expanding into anything or against anything. It doesn't work the way you perhaps think it does.

 

[Greenlight]

No?

well i guess we could make one up...we can call it dark action. Now my equations work! j/kbut really isn't there dark energy? doesn't energy do work? isn't work action?

 

[phinds]

No?

well i guess we could make one up...we can call it dark action. Now my equations work! j/kbut really isn't there dark energy? doesn't energy do work? isn't work action?

The expansion of the universe is not that kind of thing, weirdly enough. There are TONS of threads on it here on PF. I suggest you poke around and read some of them, and/or just study the phenomenon online. Although exactly WHAT dark energy is is not well understood, how it works is.