Silenus said:
Okay, I'm going to start by saying this to Lucretius. If you don't have time to explain things to me further, don't feel the need. You obviously can answer some questions I've always had about quantum theory from my amateur readings. If you feel its more appropriate to answer them over e-mail or message instead of forum that would be fine too. And if you're too busy, feel free to recommend books.
I have finals this week (just did my calc final, physics tomorrow), but I should have time enough to answer your questions.
Silenus said:
Can you go into some detail here? How does energy transfer from a vacuum? If it is truly a vacuum, doesn't that imply that there is nothing there, and if a transfer happens, doesn't there either need to be something to "take" the transfer, or energy to be transferred? And, if this is true, does this discount heat death? Or is that still in effect?
The heat death will still inevitably occur, but I had thought, from your original post, that you believed this somehow indicated the universe would last a finite time. It now seems like I've misinterpreted what you originally said. I'll address the point below and use this section to talk a little bit more in depth about virtual particle production and annihilation. I'm a few years away from quantum mechanics courses but I've done my fair share of reading so I will do my best to explain.
To begin with; there is no such thing as a perfect vacuum. The reasons for this are somewhat subtle, but I think they can best be understood in the following manner. A vacuum is a certain region of space will fewer particles than normal, and thus the pressure is much less. In order for a perfect vacuum to exist then, the pressure in such a region must be zero. What creates pressure then, will decide whether or not a perfect vacuum can exist. Pressure is a macroscopic measure of a microscopic phenomenon, namely, atoms and molecules smashing into whatever it is that you're using to measure. Each exerts a tiny force, but the sum of all these tiny forces is a measurable force over an area, and this is pressure.
In order for no pressure to exist then, the atoms must stop moving entirely. Even if they moved a little bit, they would eventually hit your sensor, resulting in a very minute, but still measurable pressure. There are two things that don't allow this to happen:
To make atoms stop moving entirely, we would need to attain absolute zero. Quantum mechanics does not allow this, for it would violate the Heisenberg Uncertainty Principle, which states we cannot know the position and the momentum of a particle simultaneously and accurately. If a particle stopped entirely, we would know it's position and therefore, it's momentum.
In fact, even at absolute zero (this is something I will learn in Q&M) a particle would have a residual energy. The reasons for this are unknown to me, but it comes out of some math and I'd wager a guess this is also due to the uncertainty principle.
So no perfect vacuum can exist.
What happens with the energy transfer is this: the vacuum can spontaneously give rise to particle/anti-particle pairs. This is such that energy is conserved because the particle and anti-particle annihilate one another and the sum energy lost is 0. We can observe the effects of these particles in terms of the Casimir Effect. The resonance energy (the energy a particle or vacuum has even at absolute zero) results in an inward push on, in the case of the Casimir Effect, two parallel plates standing very close together.
The main importance of this virtual particle pair production, I think, is in terms of the early history of the universe, when inflation took place. The expansion was in fact so rapid that the expansion of the universe pulled these particle pairs apart before they could even annihilate, resulting in the particles we see today. This would mean, in terms of energy conservation that gravitational energy is negative energy! A bizarre notion, and one I am currently reading about in Alan Guth's book.
When we get past simple thermodynamics, things get quite complicated quite fast. I'm no expert as you can tell I've got a lot to learn, but the basics can be understood with a bit of searching.
Silenus said:
My contention here is that, despite the fact the universe will continue, the winding down of macroscopic systems seems to indicate that they were wound up. I understand this does not prove theism, but it does make it a reasonable place to begin exploring, since the random processes on a microscopic level never reverse the nature of entropy.
I see where you are coming from. If the universe is heading towards greater and greater entropy, how could such a time have existed in which entropy = 0, without negative entropy proceeding it? Well, without touching on the "origin" of the fundamental forces (they are called fundamental for a reason), we can see that, assuming space and time exist ( I don't see how we could get anywhere if they didn't), the universe could have followed the process I described before. The energy for a gravitational field is negative, and a lot of negative potential energy must have been stored in the early universe when it was very tiny and dense (thus gravity would play a rather large roll). When inflation occured and this negative potential energy was released, the energy from the vacuum fluctuations (positive energy) could have been harnessed (this would imply the total energy is the universe might be zero), producing all the particles we see today. What led to inflation, you might ask? I'm no expert on inflation and in fact I'm reading Alan Guth's book for the second time now to try and wrestle with the concept. If you wish to know more, I would recommend his book, but be sure to do some research on a Higgs Field prior to your read, as things get pretty hairy after the first eight or so chapters.
Hope I answered some questions. Feel free to ask more. I've probably confused you more than helped you!