Quantum Mechanics and General Relativity are fully compatible, and have a common origin: the expanding (hyper) balloon universe.

Please download the paper and then read the abstract (since crucial formulas are not appearing in this window, and also hyperlinks are not working). This is just an overall view: Relativity is 'inside the light cone' phenomena, while Quantum Mechanics is 'outside the light cone' phenomena, dictated just by the scale (whether we use human/astronomical scale or sub-atomic scale). Quantum Mechanics (QM) and General Relativity (GR) have both been spectacularly successful, but limited to their own domain (i.e. for the tiniest and largest scales respectively). The reason for their divergent predictions lies hidden within the words ‘tiniest and largest scales’. Special Relativity is based on constancy of speed of light for any observer. By basing his theory on this postulate, Einstein unknowingly selected a scale: the classical/human scale and above (i.e. astronomical scale), which uses 3 spatial coordinates and one time coordinate. However, for Planck scale objects, there is only one spatial dimension and three temporal dimensions (i.e. nature’s viewpoint prevails). That's exactly why physicists like Dirac and Feynman were amazed at how finely tuned Quaternions (which uses 1 real number and 3 imaginary numbers and hence best represents 1+3 spacetime structure) are in describing the physics of the very small. Both QM and GR have a common origin, which can be understood only through the proper model of our universe. Physics and cosmology are intimately linked. On the one hand, the greatest challenges facing cosmology today are dark matter, dark energy, information loss (paradox) due to singularity inside black hole etc. which are just relics of our misinterpretation of General Relativity (GR) of physics. GR is mathematically sound, but is based on a faulty assumption of ‘4 dimensional spacetime continuum’, which is a ‘block universe’ view in which there is no distinction between the past, the present and the future! Unlike real numbers, imaginary numbers cannot be taken as an independent axis. Imaginary number i enters through the temporal dimension, and turns the spacetime metric into (-,+,+,+). All those above-mentioned problems magically vanish when we realize that GR is just the viewpoint of a ‘trapped being’ which is an inside view (since there is no concept of ‘outside’ in GR). That is exactly why GR can’t predict the global structure of the universe, nor can it accommodate ‘external field effect’ (which has now been confirmed to 11 Sigma accuracy in galaxies and galaxy clusters). Don’t worry: we won’t require a fifth dimension. On the other hand, Quantum Mechanics and General Relativity (which are our two greatest physics theories, and the two pillars on which our modern physics rests) seem to be utterly incompatible. But in fact, relativity and quantum principles are like two sides of the same coin. This is what is happening: 3+1 (Classical regime) 2+2 (Compton regime) 1+3 (Planck regime) Relativistic Quantum Mechanics uses the Compton scale lying intermediate between (3+1) and (1+3), and has a spacetime dimension of 2+2 (as proved by G.N. Ord; Fractal space-time: a geometric analogue of relativistic quantum mechanics. 1983 J. Phys. A: Math. Gen. 16 1869). Just as temporal and spatial dimensions changes role at the event horizon of a black hole, similarly, the exchange of temporal and spatial roles at the Planck scale causes it to appear like a Schwarzschild black hole (this view is supported by modern research. Similarly, an electron or other standard model particles can modelled by Kerr type black hole). Therefore, depending just on the scale, the same volume inside a room can be smooth (as GR demands) and punctured everywhere (as Planck objects demands) or appear frothy (as QM demands). Plank scale introduces a minimum length scale in nature, and solves several problems at once: 1) Explains Ultra High energy cosmic ray and the TeV-photon paradoxes 2) Explains why duality (which is immensely powerful concept in physics) arises. 3) Explains the origin of exotic Quantum phenomena (see next paragraph). This recent paper [‘Quantum principle of relativity’; Andrzej Dragan, Artur Ekert, New. J. Phys. 22 (2020) 033098] has shown that every exotic Quantum effect like superposition, entanglement, probabilistic behavior etc. can be explained just by assuming superluminal observers. This superluminal phenomena is not possible in our human scale, since the Minkowskian coordinate system (3+1) we use simply won’t allow velocity greater than velocity of light (c). However nature uses superluminal communications all the time (which allows Quantum entanglement’s ‘spooky action at a distance’ which challenges Einstein’s causality and relative simultaneity restrictions). The largest and the smallest (i.e. the domains of GR and QM) in the universe are tightly linked as highlighted by the ‘large numbers hypothesis (LNH)’ proposed by Hermann Weyl, Eddington, Dirac et al. But due to the unavailability of exact size & shape of the universe, those ratios could not be shown to be exact. The aforementioned tight link also manifests itself in IR/UV mixing, and the 'unnaturalness' of the Higg boson's mass. There are however other very serious issues to deal with (like the ‘time problem’ since quantum mechanics require universal and absolute time, whereas general relativity regards the flow of time as malleable and relative) before any meaningful reconciliation of QM and GR are possible. To see how both the demands of Quantum Mechanics and relativity can be easily satisfied, we need to build the true model of the universe. Unfortunately, our presently accepted model (based on Friedman’s equations, and ultimately on General Relativity) rests on a faulty assumption. The mistake started with our misinterpretation of Minkowski SpaceTime equation (which explains all of special relativity including time dilation, length contraction, relative simultaneity etc.). We have mistaken a dynamic 3d hypersheet (composed of field & particles) moving in a 4d hyperspace, for 4d spacetime continuum. This led to the 'block universe' view (pioneered by Minkowski and Einstein) in which there is no distinction between the past, the present, and the future. This view is in stark contrast to our everyday experience, as well as with an astonishing number of observations in the whole of science. This mistake took place due to our lack of understanding of i (square root of -1), which differentiates the temporal dimension from the spatial dimensions, and hence causing the metric to appear as (-,+,+,+). Imaginary numbers cannot be taken as an independent axis. The same spacetime metric is used by General Relativity (although in the form of tensor calculus), and hence GR is also an inside view. As an immediate consequence of making this correction, one dimension got freed up (which we were reserving unnecessarily). Kaluza’s miracle of obtaining Maxwell’s equation in addition to Einstein’s equations seemed to demand a heavy price: a fifth dimension was required as an embedding space. Actually, 4 dimension is sufficient (and we get electromagnetic phenomena as a bonus!). Using logical reasoning, the correct model of the universe is obtained (an expanding hyper-balloon), whose theoretical value of Hubble constant agrees very well with observed (accepted) value. From this model, we can decipher nature’s deepest secret. Nature does not use two separate rule books, but two different viewpoints. Everything, from the tiniest quark to the Galaxy clusters is telling one single story. From this model, we can see that there are 2 viewpoints involved. From our viewpoint (i.e. from the viewpoint of a trapped creature in the wall of our hyper balloon universe) locality is absolute, while from the center of the universe viewpoint (nature's viewpoint) simultaneity is absolute, since all points which are at the same distance from the true center of the universe exist simultaneously. In other words, the same duration have passed since the Big Bang for all equi-radial points. There indeed is absolute simultaneity (as demanded by Sagnac effect), and absolute universal time (as demanded by quantum mechanics) from this viewpoint. This solves the 'time problem' which had so stubbornly resisted the reconciliation of Quantum Mechanics and General Relativity. Every tiniest point (Planck scale objects) on the wall of the (hyper) balloon appears as 1+3 dimensional since there is only one real dimension (i.e. along the radius of the universe). The other 3 are temporal dimensions. Temporal dimension is that dimension along which any movement can be ignored. For example, we can easily ignore the tremendous velocity with which we are travelling along the radius of the universe. In a similar manner, nature/universe ignores movement along the wall of the balloon whether we travel to the moon or to the sun or to the Andromeda galaxy, because the moon, the sun, and Andromeda galaxy are all equidistant from the true center of the universe. But this 1+3 dimension phenomena is true only as long as the point is so small that it doesn’t start using 3 spatial dimensions of its own (just like we do). For us humans, it is the 3+1 dimensions in classical/human scale which causes all relativistic phenomena to appear. Why exotic Quantum Mechanics phenomena arises is also explained. N.B. Please download the paper and then read the abstract (since crucial formulas are not appearing in this window, and also hyperlinks are not working). This is just an overall view