universe

A. When you talk about “beyond,” you assume the existence of an infinite space, of which our universe is a part. Then you ask what is there outside the universe. But the universe is all space, and there is no “beyond.”
B. It is difficult for our logic to digest the idea that space is bounded somewhere and that there is nothing beyond it. We live within space and are used to thinking this way. See for example here:
https://davidson.weizmann.ac.il/online/askexpert/astrophysics/%D7%9E%D7%94%D7%99-%D7%91%D7%A2%D7%A6%D7%9D-%D7%94%D7%AA%D7%A4%D7%A9%D7%98%D7%95%D7%AA-%D7%94%D7%99%D7%A7%D7%95%D7%9D-%D7%94%D7%AA%D7%A4%D7%A9%D7%98%D7%95%D7%AA-%D7%90%D7%9C-%D7%AA%D7%95%D7%9A-%D7%9E%D7%94
C. I don’t know. Maybe you mean a larger solution to Einstein’s field equations. That’s a technical matter. See here about the rotating universe (neither contracting nor expanding):
https://www.hamichlol.org.il/%D7%A7%D7%95%D7%A8%D7%98_%D7%92%D7%93%D7%9C