What is the quantum realm? Why is it "hidden" from view behind a "door". Is this a door to higher dimensions, or a door to nowhere? Where do the quanta go when we are not looking at them?
Modern theory has looked into the problem of the possibility of a theory of everything. What is the minimum number of dimensions by which we can describe our Universe? This is not an arbitrary number. String Theory indicates that the minimum in which a Universe can be described as one consistent set of equations is 10 dimensions... Nine spatial dimensions and one of time. There can be more dimensions, as much as 26 or even more, but there can be no less.
Wikipedia: String Theory
The assumption is that objects in the Universe are not point-like at all but always extended. A naive view of this proposition would be that the extra dimensions are "curled up" into small loops or even petals so small that no normal physical particles could fit inside. The three dimensional expression of this is usually nominated a Calibri-Yau Space depicted here by an artist.
Thus nothing could "escape" from our three dimensional flat-space no matter what. The theory goes further to say that as we journey backwards to the Big Bang the energies of the Universe increase almost exponentially towards this immensely hot compact moment... the zero of all our time when the Universe came into being. At that point in time all the spatial dimensions of the Universe were "equivalent" due to the high energy of this state.
It is easy to think that at that point in time the symmetry of everything restored a primordial event where every force in our Universe could be expressed as a single mega force. As time went on the four forces of the Universe "distilled" out of the turbulence and the four forces became more and more differentiated. Today in our cold Universe we have four forces... Electromagnetism, weak force, strong force and Gravity. Electromagnetism has been shown to be a special expression of the weak force (the electro-weak force) and electromagnetism is thought to be also a special expression of the strong force (the electro-strong force) and gravity remains the undisputed "odd man out" being so weak that we have not seen a consistent way to unify it with the other three as yet. The way conjectured to be a possible way is through quantizing the manifold at the range of the Planck Length. Alternatively gravity is still answered predominantly by Einstein Theory of General Relativity... In this theory gravity is not a force but only a pseudo-force (false force) and has it's origins actually among the other three forces somehow.
Wikipedia: AdS/CFT correspondence
Perhaps we live in a Holographic Universe and most of our convictions about reality should be turned on their head...
The Illusion of Gravity: Juan Maldacena, Scientific American
If you really think reality is not as we think have your say now and try and add to this thread. Proper references and experiments should be used and any speculations should be backed with experimental results.
Great background reading should include the double slit experiment and the Delayed Choice Quantum Eraser which probably are the most important experiments that man has ever devised.
Wikipedia: Delayed choice quantum eraser
Some other experiments such as the Aharanov-Bohm Experiment and the Aharanov-Cashir Experiment indicate the presence of non-locality in space.
Wolfram Research: Aharonov-Bohm Effect
Verification of the Aharonov-Bohm Effect: Akira Tonomura
I also believe that Special Relativity "wraps around" dimensionally to become de Broglie's Theory of Matter Waves. What really happens to the world lines of particles that "stop" absolutely or even lose their mass? Is this just the "slow end" of special relativity?
Wikipedia: De Broglie hypothesis
Does our entire Universe live inside a fuzzball?
Are Black Holes fuzzballs?
Or is our entire Universe trapped on a lower dimensional "surface" as a holographic image, part of a much wider Universe we are unable to appreciate? You can use this thread to dig up some more information as well do not feel constrained by these topics...
> Problem with the two slit experiment, Observing later
I will listen and I will comment more on these things. Is quantum theory a theory of higher dimensions "projected" into the flat-space of Einstein's Spacetime? Is quantum field theory a theory of Physics that is "not even wrong". Have your say.