What's our Best Guess on How the Universe is Expanding?

I understand why its accelerating in expansion ('understand' as in understand what we've reasoned so far) but what's our best guess on how the universe originally expanded? Are vacuum fluctuations a possibility?

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TheOneyouwerewarnedabout · 46-50, MVIP

I try not to stress about it !

Animore · 26-30, M

Ha ha, I wish I could, but the question's been tugging at me for quite a while.