# Does the Big Bang need a cause? [duplicate]

Possible Duplicate:
on causality and The Big Bang Theory

When theoretical physicsists discuss the origin of our Universe, the wider consensus appears to be that it originates from a singularity; a position that rests on observations about the apparent expansion of our Universe.

However, the question why singularity itself came into being, still remains.

But this question takes a different angle: Does the Universe as a whole need a cause to exist at all?

If the law of conservation of energy is universally valid, then questions about a beginning become irrelevant since there can't be any by definition and everything boils down to dynamics of interaction. Thoughts?$$\mbox{ }$$

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## marked as duplicate by dmckee♦Jul 26 '11 at 15:05

I was considering offering an answer and then I realised I could just direct you to a lecture entitled 'A Universe From Nothing' by theorist Lawrence Krauss: richarddawkins.net/videos/… –  qftme Jul 26 '11 at 14:41
General relativity doesn't have a global law of conservation of energy. I think your question would make more sense if you replaced "the law of conservation of energy" with "the laws of physics" or "the Einstein field equations." –  Ben Crowell Jul 26 '11 at 14:41
I guess this question is a question about philosophy rather than Physics. I hardly doubt anyone in the Physics.SE can provide a reasonable answer to this without going into metaphysics! –  Bernhard Heijstek Jul 26 '11 at 14:42