Wondering if the total amount of mass is critical for the Universe.

Is there any expert out there that would know (or could calculate) how different the Big Bang would develop if the Universe consisted of e.g. a million (or billion) times more energy?

I assume the total life span of the Universe would be shorter, it would expend to a certain size and then collapse under its own weight.

But would the same physical elements be formed (atomic elements) or even the same Standard model apply to such a Universe?

Oh, and is this a standard question that has been answered long before?
Thanks guys!

Daniel