heusdens
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Originally posted by nevagil
Thanks for the info, I was curious and now I can reform some of my theories and thoughts. Now for a first thought I'll say that the photons and gravity out there was maybe nothing because it is so far away that the gravity was barely anything and the photons may be non-existent befor the big bang (no stars then?)
The cosmic rays and virtual particles are beyond my present knowledge since its been 14 yrs since my yr of physics. You'll have to take it from there.
But for the sake of stubborn argueing I meant "nothing" in the way that most humans mean "nothing". "Nothing" means nothing that we know about or comprehend, I guess even a vacuum is something, its a vaccuum.
When you say in physics there can be no "nothing" does that mean befor the big bang also or is the big bang considered impossible now?
Nothing means that there isn't anything existing. So whatever you think that can or might exist, is absent in a plain nothing. Thereofore the "nothing" does not exist, it is just a concept which is usefull sometimes.
The laws of physics, esp. quantum physics, tell us that nowhere space can be completely devoid of anything material. We can at least not find a factual clue with certainty that any volume of space contains no matter (particles, energy, fields) at all, cause that would beat the Uncertainty Principle of Heisenberg. This states that we can not observe with absolute certainty both the place and momentum of anything material. It's only applicable to the quantum world. But it also means that one cannot find with absolute certainty that a certain place is completely devoid of anything material.
The Big Bang is not considered impossible, but the theory is still incomplete and not consistent. But whatever the theory of what "caused" the Big Bang, evolves into, we will always have a contradiction regarding the existing world, which we cannot get around. For a deeper discussion about this issue, read for instannce the tread https://www.physicsforums.com/showthread.php?s=&threadid=958" which discusses a deep rooted contradiction in the nature of space and time itself. The contradiction is that both the beginning of time, and the opposite (infinite time), can be proven, but have their own problems, which are not solvable. Any way of removing the contradiction will raise more profound and even more absurd contradictions.
If you are saying that because of the insolvability of this contradiction the world itself is impossible, because it contradicts itself, you may say so. Yet it is a clear fact that the world DOES exist, including you, and that is just a fact of life.
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