the L, on 05 July 2012 - 08:56 PM, said:
I got a lot of questions about it (and about physics in general) but I will try to make a shorter list.
You mentioned broken symetry and I search a little ask questions even watch one documentary.
Why symetry is broken? In fact I think that you already answered that question-no one knows. But seems to me , as I heard one analogy, but I would like to hear you opinion on it,.
In wooden table like one in front of us where is our computers all atoms have magnetic forces in different direction. And in magnet all magnet is line up. The result is magnetic field.
Lets say that something loose symetry in our table where all atoms have magnetic forces in different direction and they choose one direction we will get magnetic field. (Physicists mention something like phase shift too). That something which break symetry is somehow connected with cooling. (Thats where you step in and try to explain it.)

Warm>atoms radiate magnetic forece in different direction ; Cooling>atoms radiate magnetic force in choosen direction...So Higgs field is result of cooling universe.(?)
Kind of, yes. There is a tendency for everything to attempt to be as low an energy state as possible. In the case of a ferromagnet, the low energy state is one where the spins are all aligned, creating a net magnetic field. However since heat is basically just random motion, it will be more difficult of spins to align consistently when everything is jumping around. Once things cool down the spins have two possibilities: be frozen in random alignment, or be frozen in an ordered alignment. Since the low energy state for a ferromagnet is an ordered alignment, that is what is ends up happening.
So yes, I think it is fair to make the argument that the Higgs field is a result of a cooling Universe.
the L, on 05 July 2012 - 08:56 PM, said:
Also what about that symetry theory. That EVERY particle we know have one undiscover partner. So just when we thought that we know something back to begining.
My personal opinion is that supersymmetry is not correct. But I can't really back this up with anything better than ``I don't like it''.
the L, on 05 July 2012 - 08:56 PM, said:
Furthermore, what do you say do we actually BELIEVE in Einstein general theory of relativity? Im mean no one ever seen Quark. We believe in Black holes yet no one ever seen in black hole. Probably never will.
Well Einstein never said anything about quarks... but yes, I would say we believe Einstein's theory of relativity. The predictions of his theory on the effect of velocity and gravity on time have been tested fairly thoroughly (the lifetime of unstable particles in a lab versus in an accelerator, the differences between highly accurate clocks on the ground, in airplanes, and in satellites, etc.) and everything seems to work out as expected.
So we believe that Einstein's theory is an
accurate description of the Universe for a particular range of distances, velocities, and time. Einstein's theory doesn't explain everything though, so it clearly is not complete.
However we believe that just like General Relativity simplifies down to Newtonian Mechanics (for slow moving, light objects), we believe that the as-of-yet-undiscovered more complete theory (possibly String Theory, possibly something else) will simplify down to General Relativity in the right conditions.
the L, on 05 July 2012 - 08:56 PM, said:
Do you believe in big bang theory or in big bounces theory, which is seems quite popular? Do you believe in multiverse?
I believe in the big bang, I don't really like big bounce or multiverse theories because to me it seems like they are trying to explain problems (why did the big bang even happen, why is Quantum Mechanics probabilistic, etc.) by introducing infinite complexity (everything happens all the time over and over again!).
the L, on 05 July 2012 - 08:56 PM, said:
Do we understand foundation of our physics? For example snowflake foundation is hexagon but everything else is different. Do we know physics "hexagon"?
We know why snowflakes are usually (but not always) hexagonal. But I think the question you are asking is more metaphysical in nature. We can use General Relativity to explain what gravitational force will
do, but we can't explain
why gravitational force exists.
the L, on 05 July 2012 - 08:56 PM, said:
Also we knows how things work in quantum realm and in classic physics realm, but what happens between? What rules work between? Where is border that one could say okay from there classic laws of physics dont work anymore?
In my opinion (and, by the way, I study materials physics so this is the
one part of your post where my opinion might be valuable) this is answered by the concept of entropy (i.e. the Second Law of Thermodynamics). I don't know
why there is such a thing as entropy, but it does seem to exist and it does seem to always increase.
Much of the ``weirdness'' of Quantum Mechanics is related to entanglement: when a single wavefunction describes what we might normally think of a collection of individual particles (i.e. one
N-body wavefunction instead of N
one-body wavefunctions).
It turns out that the entropy of an entangled ensemble is much less than the entropy of a decoherent ensemble (see the wiki on
von Neumann entropy), so just by the Second Law of Thermodynamics we have a reason why the more particles you have in a system the more classical the behaviour is. (This is another example of spontaneous symmetry breaking.)
Since entropy is linked to temperature, this also helps explain why most of the many-particle Quantum effects like superconductivity, or Bose-Einstein condensation, etc. can only happen at very low temperatures.
So there isn't really a ``border'' between Quantum and Classical Mechanics. In fact, Quantum Mechanics should work for regular everyday objects (like throwing a baseball), but since you are dealing with ~10
23 particles at 300 K, none of the weird, probabilistic possibilities that the baseball could technically do will ever happen (it is
possible for a baseball to Quantum tunnel through a brick wall, just
incredibly unlikely), and therefore simple Newtonian Mechanics will give you the same answer with much less effort.
For that matter, you wouldn't use General Relativity to calculate the trajectory of a baseball either, although you could, and it would eventually give you the same answer as the one you quickly calculated with basic Newtonian Mechanics.