quantumdream

"In phase" suggests that gravity has a dimensionality with wavelengths on cosmological order, and "out of phase" that E-M has this dimensionality with wavelengths on the order of a millimeter (from extradimensionality models of spacetime and lower limit on measured gravitational effect). Long wavelengths tend to stay in phase over a given distance, whereas short ones would tend to interfere over that same distance. Coherent-phase extradimensional waves enable the efficient transfer of gravitational information through vast spacetime, but only narrowly for light.

Assuming inflation with its greatly superluminal expansion, there should be multiple spherical event horizons (cycles) alternating outward for each multiple of "c." First our local forward time universe, then a tachyonic reverse time spacetime, then forward, etc., reflected many powers of ten times relative to our observation. Our initial horizon is defined by where the conventional-time cosmos first expands away from us at the speed of light. Beyond that a mirror tachyonic spacetime (c<v<2c) reverses the direction of time, as does the third region of spacetime (2c<v<3c) over that of the second, now effecting forward time once more. This continues for n cycles, where n~10^80/10^28, the ratio between the inflationary and linearly expanding universe radii.

Close enough. It seems like you are near the definition of a brane, where gravity is always "in phase," and parallel E-M "out of phase" with parallel dimensions of compactified/extradimensional space. It would take years for a light signal to travel the distance which for gravity would take a moment.

Radical Edward, That should be E^2=... (Otherwise, you have the crux of the solution.) and light, because of the negative time term, takes the longest path in spacetime. ........... One way to think of photons having energy is their different curvature for different gravitational potentials.

The question might be, [how] does eliminating information paradoxes restrict the topology of spacetime? If there are no spacetime singularities allowed, anomalies involving an intersection from joining two separate timelines might be eliminated. Then again, branes or strings could smoothly connect disparate paths. In this latter case, uncertainty may justify the "coexistance" of many parallel, indistinguisable events.

I propose that any quantum, such as a photon, has a phase space inherent to itself, reciprocal (through Planck's constant) to the conventional phase space surrounding it. It follows that the inner and outer phase spaces may interfere at this "h" surface. "Reciprocal phase space infers to the individual photon the information needed for interference with surrounding conventional phase space. Correlated at some past event, these phase spaces together enable single particles to 'self interfere' where [action eigennumber equals reciprocal action eigennumber]." Any mutation of Young's experiment may be cast as phase space interference local to the quantum's spacetime. More detail may be found at the first article of my website, http://www.quantumdream.net. blike, does not the quantum eraser you mention depend whether or not the detector records the events macroscopically? I. e., I cannot chalk up an event on a slate, then erase it, and expect the interference pattern to change. Scientific American has had some good articles on quantum logic in the past few years.