dehammer wrote:
"the point is that its not the vacuum that causes expansion, its the initial pressure from the big bang."

No! No! No! and No!

There was no pressure. No physicist I know has ever used the word pressure to discuss it other than with refence to a children's-level explanation about blowing up a balloon. For pressure to be involved one would need to have space with high pressure surrounded by space with a lower pressure. There was no other space.

We can not teach you physics one post at a time. Please try reading a book.

DA Morgan