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>>7669
>Oh really now? The Heisenberg Uncertainty principle states that if particles arise from a zero-energy state, then they must last forever (which our universe will).
So if they last forever they possess an infinit past which means they are former than the universe they live in... great, problem solved(!); but if they last forever, they are infinit, and if they are infinit they wouldn't arise from neither zero-energy or no state whatsoever becayse they just happen to always been there. Also, this contradicts evidence, since virtual particles, by that view, shouldn't exhibit short range, they only do that precisely because they don't 'come out of nothing'.
>The point is doubly moot, because quantum tunnelling events can bypass such barriers anyway.
Quantum tunneling can only bypass ground states of minimal energy levels, not supposedly states of zero energy. If there.'s something that the uncertainty principle states is that it's not possible to remove all energy from a system, there always remain a residual level in the form of quantum fluctuations; there's no equivalent of absolute zero in quantum states of energy.
The argument as proposed by some is akin to a stadium with half suporters of team A and the other half of team B, so that in the perspective of support for team A we have +50% (for A) and -50% (against A), because the net support (or fluctuation) for either teams is zero, one can say, applying the same reasoning, that it's like the stadium is empty with the pseudo justification that both team supporters cancel each other out, and that way the logical conclusion is that the noise from the stands come from nothing. The full transposition of the analogy is that, the same way quantum processes can't have zero energy states, even if the crowd was all 'silent' in the stadium the players in the field would nevertheless listen to some murmur noise (people moving in their seats, coughing, mobile phones ringing, etc), the players wouldn't be able to precisely track the origin of the noises but would undoubtly feel it anyway; so you see, we might say that a kind of uncertainty principle with the same properties of the physical term applies also in social events with similar predictions. That was the base and inspiration of John Cage's famous 'silent piece' (4'33''), it purpoted to demonstrate that absolute silence is impossible in a concert, so that if the musicians are silent the 'music' come from the crowd.
But to follow the fully consequnces of their reasoning, ex nihilo supporters must accept also other pseudo derivatives like free energy and perpetual motion both of which are in accordance with 'out of nothing' sources, but why stop there because if a full universe could come out of nothing many other events also can, maybe the Egypcian pyramides or the Niagara falls could just have spontaneously arised, why not...
Another point relates to the persistence of considering gravity as negative energy because it seems evident to me that matter and nearby gravitational fields are bound states so that an increase in kinetic energy corresponds to a decrease in energy 'stored' in the gravitational field; as the universe is composed of matter obviously the spacetime distortion gravitational effect is proportional to increase/decrease in energy matter so that the net effect is null and thus the sum of all energy in the universe, provided the universe is flat, aproach zero.
The Davies quote completly eludes me. He says: "In the gravitational case the situation is still more bizarre, for the gravitational field is only a spacewarp - curved space. The energy locked up in a spacewarp can be converted into particles of matter and antimatter... ...Thus, matter appears spontaneously out of empty space." Empty space? As far as i know the gravitational field is a spacetime geometry distortion caused by matter/energy, and of course wherever matter and energy arise they can be converted in emission of particle/anti-particle pairs. Einstein once said: "People before me believed that if all the matter in the universe were removed, only space and time would exist. My theory proves that space and time would disappear along with matter." So, no matter, no spacewarp.
Let's enphasize this point: nothing is a state of absolute 'nothingness', not a degree of precision derived form wave-like behaviour, or uncertainty, or doubt, because even a statistical distribution refers to concrete and real events, although they express the state of knowledge about those events in a [0-1] interval. Nothingness contains nothing at all, the absoslute void, not even the quantum void which has fluctuations and spacetime in it. In that vein, singularities don't qualify also as nothing, although they can be viewed geometrically as zero volume points, but with infinite pressure and density, and that's why Hawking advocates that quantum effects prevent the formation of singularities, at least general relativity speaking. So in that context all this roundabouts about creation ex nihilo seems more like a misplace of terms than anything else. To validate what i've just said let me call upon the words of Vilenkin himself:
>T]he state of “nothing” cannot be identified with absolute nothingness. The tunneling is described by the laws of quantum mechanics, and thus “nothing” should be subject to these laws. The laws of physics must have existed, even though there was no universe. - Alexander Vilenkin in Many Worlds in One, p.181
>So you openly admit you're skewing the results of science to try to make God exist.
You are good at distorting words. The question really is why are you afraid of God? God doesn't bite nor Is the bogeyman. That moral superiority attitude towards the 'poor souls' that need a God or paternal figure doesn't suit and it's a signal of mediocrity. I don´t talk of a personal God or a biblical God but instead of the God that is the origin of creation, the problems you have with the former ones are up to you. Regarding ex nihilo theories, my position is that of salutar cepticism, i do not refute, i raise (strong) objections (stranger things have already happened in science). Oddly enough is that the ones who don't aknowledge God rush so fast to this proposals; in their ansiety to refute It they push science to the vicinity of God, since God might actualy have created the universe out of nothing afterall, but to explain that you have to provide the mechanism and to do this you need to invoke God; God is right in front of your noses and you can't see it. God exist in spite of what you or anyone else may think of it, the same way that anyone's opinion relative to the speed of light is irrelevant