Dr. David Snoke Explains How General Relativity and Quantum Mechanics Are Not Compatible

- Why are general relativity and quantum physics incompatible? How is that macro world and micro world work according to different rules? Since we are also made of atoms what does this say about us?

- Yes, this is one of the great problems of modern physics: putting gravity and quantum mechanics together. I don't think anyone would say it’s impossible to put them together, but no one has succeeded yet. Part of it, it just is different length scales. In general relativity, the effects normally we would only see on very very large scales of the distance of stars, although if you want to get extremely accurate, then you actually do need to pay attention to general relativity. The GPS satellites that we all use actually use general relativity in their calculations and that’s because they want to get extremely accurate to many decimal places. On the other hand, quantum mechanics, typically the effects are even much smaller scale than us, down at the atomic level. And part of it is just the mismatch between those. Now a lot of the normal physics that we experience is averaged over many many particles, and so even in one gram of material you might have 10 to the 23rdatoms, which is one with twenty three zeros. It’s just an enormous number of atoms, so almost always at the level that we live at, which we call the macroscopic, we see average behavior of a lot things and so we don't see these tiny quantum mechanical effects. That’s not always true actually. I study things called Bosecondensates, and you can have a Bose condensate, or a superconductor, which show quantum mechanical effects even in large-scale systems. So it’s not quite accurate to say that quantum mechanics is always only at the small scale. But typically it is. And so we typically don't worry about it. But the other thing I would say is, special relativity and general relativity are considered by most scientists to be very well understood in some sense classical theories, that they don't involve anything that is really conceptually hard for us philosophically. Now we have to change our concept of time, but if you can do that, then actually special relativity and general relativity are not that problematic. Quantum mechanics on the other hand, people still argue about it. I was just at a meeting a couple of weeks ago, where we were five Christian scientists debating about the meaning of quantum mechanics and didn't agree between ourselves. Because quantum mechanics is still not considered to be a fully understood theory, so we can do a lot of things with it; calculate things extremely accurately, and yet still debate about what it all means and what’s really going on with it. So part of the reason why putting gravity and quantum mechanics together is hard is because we still don't entirely understand quantum mechanics in some ways as to what’s really going on at the basic level.

 

 

 

 

2018-07-07 15:59:10

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