I have been doing some reading about the start of the universe and some sources would state that the universe started as a singularity. But how does this not clash with the uncertainty principle?
closed as unclear what you're asking by Kyle Kanos, WillO, Yashas, honeste_vivere, Jon Custer Jul 5 '17 at 18:50
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Uncertainty principle is a quantum phenomenon, which is not present in general theory of relativity. The singularity of big bang is appearing when you try to describe the evolution of the universe in general theory of relativity. So the relativistic singularity does not violate any quantum laws, simply because no quantum laws are considered.
If you want to consider quantum effects at the big bang, you need to unite general relativity with quantum field theory. This is difficult and not yet completely resolved. It is assumed that such united theory would remove the singularity, because the sigularity is most likely just a failure of general relativity to describe physics at quantum level.
For more information read here.