# Thread: How Did Quantum Fluctuation Cause the Big Bang?

1. Please can you help me with this? I think that I understand the basics of the Heisenberg Uncertainty Principle, however don't know how the fluctuations that cause matter to appear, appear themselves. I do understand that users who comment on this thread mustn't give me the answer, however I would appreciate it if you could direct me towards the correct websites. Thanks in advance; it's for a debate on Monday, so replying soon would be great!

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3. Who says it did?

In your position I'd start with wiki for Big Bang and for Heisenberg and follow any useful/ interesting links you find - but I'd be really surprised if you came across a competent physicist maintaining that any specified process, quantum or otherwise, caused the big bang. There's a nice assortment of possibilities, but no one's demonstrated anything to the satisfaction of the scientific community at large.

EDIT: Whoops. I didn't notice that it was a debate topic. It'd be handy to know whether you're arguing for or against.

4. The Heisenberg Uncertainty Principle says that certain pairs of values have a relationship such that the definitely one value is known, the less certain the other is. One such pair is energy & time. If you specify the time more precisely, then the energy becomes less well defined. This makes it possible for particle-antiparticle pairs to be created and then destroyed for very short periods of time - enough energy can be "borrowed" for a short enough time to create the particles. The more massive the particles (i.e. the greater the energy) the less time they can exist for.

I think (I don't pay much attention to this sort of speculation) the way this is used to explain the start of the big bang process is that the universe was initially in a metastable "false vacuum" state. At some point, one of these quantum fluctuations provided enough energy to push the local vacuum "over the edge" into a lower energy state. The energy released by this created the know universe.

Although it is theoretically possible, there is no evidence for any of this.

Quantum fluctuation - Wikipedia, the free encyclopedia
False vacuum - Wikipedia, the free encyclopedia

5. "EDIT: Whoops. I didn't notice that it was a debate topic. It'd be handy to know whether you're arguing for or against."

It's a science-versus-religion sort of thing; the fifth that we've had since I got a new R.E. teacher mid-way through last school year. Oh - by the way - R.E. classes are mandatory in my Catholic school. The statement is 'science proves that God did not create the universe'; I don't think that it absolutely proves it, but I'm willing to punt that science is the better bet. I've chosen to focus on the Big Bang, and how we - to some extent - can explain it.

6. "[QUOTE=Strange;463402]The Heisenberg Uncertainty Principle says that certain pairs of values have a relationship such that the definitely one value is known, the less certain the other is. One such pair is energy & time. If you specify the time more precisely, then the energy becomes less well defined. This makes it possible for particle-antiparticle pairs to be created and then destroyed for very short periods of time - enough energy can be "borrowed" for a short enough time to create the particles. The more massive the particles (i.e. the greater the energy) the less time they can exist for.I think (I don't pay much attention to this sort of speculation) the way this is used to explain the start of the big bang process is that the universe was initially in a metastable "false vacuum" state. At some point, one of these quantum fluctuations provided enough energy to push the local vacuum "over the edge" into a lower energy state. The energy released by this created the know universe."

Thanks for the detailed explanation! I think that it will provide a good opening argument for the debate. Also, may I ask where you're from? I was going to try and guess which country you're from, however realise that calling it 'Oriental' may be so general as to be offensive, and calling you Chinese or Japanese simply because they quickly spring to mind may create the same effect through the opposite means.