I've heard that relativity and quantum mechanics are at odds ie that they "can't both be right." Hence I was weary, not about Plank's constant, but all those other things: mass, time and length. That seem to have as much to do with relativity c as with the constant.
It seems like taking a quanta from from quantum mechanics and taking the speed of light which relativity was built upon. Putting them together to make mathematical predictions that if were proved, would then assume that there was never a conflict between relativity and quantum mechanics.
There is a speculative part about where "theories of everything" should "go" from here... There are some who believe that particle theory can be extrapolated to an ideological "extreme" where space and time 'break down" into quantum foam. Prometheus has brought this point up in mentioning Planck Length and 'stuff" going down the quantum drain to "who knows where". I believe this extreme POV may be pure "bunk"... though "bunk" does have it's uses (... beyond endless amusement for the mathematicians). Special Relativity is an exercise in which phenomena are measured in the real world in which the extremes of a theory become the beginnings of "new theory". The old theory was Newtonian Mechanics and the new Theory is Relativistic Mechanics (Special and General Relativity) and Quantum Mechanics. What is important to note is how to interpret this mix in our physical world. A hundred years from now a lot of what we are saying in this area of "philosophy" will be laughable. In hindsight we will consider some of this really 'dumb".
The concept of the Heisenberg Uncertainty Principle (HUP) along with the speed of light, the universal Gravitational Constant and Planck's Constant 'defining" a distance which this expected "defect" in spacetime occurs is IMHO a 'failure of imagination" and not a failure of the continuum. It is like saying that spacetime is like a carpet on the floor and if you stand in it in "high heels" it tears a "hole". What any theory of spacetime tearing avoids is discussing what is "under the carpet". In Physics HUP is a measure of the way in which orthogonal observables in many various physical systems 'diverge" when one is measured with greater and greater accuracy. There is a 'granularity" in a product of the precision of these measurables which can never reach zero. When measuring a "measurable" if you try to determine its value to a degree greater than a certain value, it alters the other conjugate variable by an even greater amount.
Wikipedia: Complementarity (physics)A couple of these linked parameters in a system are position and momentum, energy and time, space and time. This phenomenon is linked to the collapse of a quantum state and a particular interpretation of Quantum Mechanics called the Copenhagen Interpretation... There exists a prior condition in which the measurables are not known (in this situation the values are in a 'superposition of states")... The condition collapses into a state in which two parameters are known but with an imprecision that is strictly "limited".
In the case of position and momentum and we may use "tiny projectiles" to determine the position of a small object such as a nucleus, we have ways to detect "particles" of every kind so this initially sounds like a 'good idea". The deflection and final distribution of these tiny particles can be used to determine where the "unseen" target is. Fire a lot of small projectiles and this gives you an idea, when you look at the distribution of deflections around the targeted position, where you 'think" the unseen particle exists. This is 'good" when the particle you are firing is very small and light and the thing you wish to determine the position is big and heavy. Case in point is firing electrons or alpha particles at a thin gold foil... Contrary to what you may think most will go through suggesting that gold is mostly 'empty space". Some are deflected at high angles suggesting that there are tiny "hard" particles somewhere inside of that 'matter"... the nucleus. An analysis of this deflection gives us an indication of the size of the nucleus to the size of the entire atom in gold. Take the case of a gunslinger practicing with a light tin can and his six shooter. Each "bullet" that hits the can "kicks" it many meters away from it's initial position. This makes gunslinging practice 'fun" but particle physics a "Hell". The target is "scattered" with each "hit" an indeterminable amount.
Perhaps we should use really light bullets traveling at a very low velocity? The "phenomenon" suggests that a fuzzy measurement of one variable would necessary lead to a fuzzy determination of the other variable because the second measurement depends on the first variable. In the past the idea was to improve the measurement of the first variable and this will lead to an improvement in the accuracy second "dependent" variable. IMHO this problem arises with out methods of analysis which are based on the concept of 'point particles" where the position of a point particle can "theoretically" be determined with infinite accuracy (right down to a single point). In actual fact a particle could only be determined up to a limiting condition since a particle is a
distributed object so has no "point distribution". You can use bigger and bigger "hammers" to try and probe the "core" of the "point particle" but the more energy you use the more the particle you are trying to "probe" is kicked by this "force" to Hell and back.
Many processes we are trying to measure revolve around small and very light particles compared with your standard blacksmith's anvil. In many cases the energy that even a single photon carries compared with the mass of some of these very light particles is "significant"... so even firing a single photon at it suddenly "boots" the very light object into "the next room". It is like playing billiards with billiard balls weighting a trillionth of a gram. All photons have a relationship to energy that forces it to carry a particular "kick" related to it's wavelength (E = hf). The other problem is the physically smaller the particle you want to "see" is... the shorter the wavelength of light is required to "see" it. If you do not use "short wavelength light" to "see" it with you run the risk of missing seeing it altogether. Conversely larger objects are able to to scatter longer wavelength light but the energy of long wavelength light carries is much lower than short wavelength light.
In the first case we are using sticks of TNT to detect a ping pong ball in the later case we are striking the Empire State Building with a feather. In both cases we wish to see what the "response" of object being "struck". These measurements are are odds with each other. So while we know where the particle "was" we now do not know where it presently "is" after making a "measurement". So a stationary particle at a particular position in a room is now moving with a considerable velocity in some direction away from where it originally was with a certain momentum. The "harder we try to accurately determine position" the worse the estimate of the momentum since these are mutually influencing strategies. The relationship is the Heisenberg Uncertainty Principle.
To be strictly correct with your statement above Beer w/Straw the "flavor" of Relativity is General Relativity (Electromagnetism, Quantum Physics were "unified" using Quantum Electrodynamics (QED) in the early 1950's). We know about absolutely 'everything" and how it works... except some "minor" aspects of "radioactivity"... which has to do with 'resonances" in the Nucleus in atoms... Quantum Chromodynamics (QCD)... and Gravity. This is the same position science was in at the turn of the 19th century when it was simply a case of 'dotting the "i's" and crossing the "t's" and then they would have known 'everything... he he eh! What is "work outstanding" is unification between General Relativity (Gravity) and Quantum Physics (QCD and QED). This is the "continuum" vs the quanta or "discretization" of all thing "material" into "packets". Flows easily off the tongue but there are a lot of pitfalls in that "simple" step. IMHO it has led to quite a few "Black Holes" between peoples ears.
The "automatic" approach was to assume to go down the path of quantizing this "manifold" which is continuous in General Relativity to "accommodate" particles... this would mean that way way down below there would be this "quantum foam" at or around the Planck Length. In the opinion of those in the know (not me) this approach is "apparently" mathematically contradictory and does not balance dimensionally (parameterwise). Yet there is a group of hard nosed individuals that think that if you get a big enough hammer the square peg can be driven into the round hole. Some string Theorists and some Loop quantum gravity people believe that it can be dome.
IMHO this approach is not valid. There are other approaches that can be taken. The other problem with these theories that rely on a Planck Length 'failure" in spacetime is this theory is not directly testable. We would need to harness a significant portion of the amount of energy of the Big Bang to actually test it and a particle accelerator the size of a couple of decent galaxies. I am not kidding about that. Our civilization will probably never be able to test these ideas. If we can't test them then it is not Physics... by definition. Physics is not philosophy and every physics theory must be tested to remain physics. One small failure where the theory fails to match the experiment does not mean the Universe has "got it wrong"... the theorists have got it wrong.
If I can express an 'opinion" the direction of progress in these matters is not towards a "breaking down of spacetime". Black Holes are not necessarily a "breakdown" of any kind but a warping in spacetime into "higher dimensions". The "fabric of spacetime" does not "tear" and there is "nothing under the carpet" to explain. The next step is to ask a question about that 'highly stretched" elastic surface which "appears like a boundary"... must separate our universe from something else... It is a surface on the "Light Cone wall of our spacetime". That "something else" may be other spaces in which our Universe is "embedded"... someplace where this universe has originally come from ... before there was a Big Bang.... outside of our time and space.
Wikipedia: Light ConeCheers