Well, there are two different forms of velocity involved. Light, as a wave, is not the same as a photon but instead constructed from ratios of detections (you need to be able to detect both the reinforcements as well as the cancellations and so measurement of a wave isn't possible with just one detection of a photon).
In order to measure a velocity, we need a unit of distance (meter) and a unit of time (second)
The definition of a meter http://physics.nist.gov/cuu/Units/meter.html is:
Meter
SecondThe meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
Notice that the measurement of a second is a statistical construction that requires a very large number of photon detections to occur. In order to have a high confidence that every transition has been detected, we need a very large number of photons per cycle to be detected (i.e. I'm certain it's well over 20).The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.
There's no manner to actually see any of these photons travelling through space either and they actually accumulate in parallel along the surface of a measurement and so the velocity individually is not being measured. An impulse of a wavefront can arise from a transient increase in the probability of a/the photon being detected at that point and it does not mean that a group of photons were travelling in parallel and waiting to be detected.
Consider the twin list experiment:
If a photon could only travel at light speed, then it couldn't "race ahead" and sideways etc. in order to see what lies ahead and make decisions relative to the space preceeding it but many experiments have shown this phenomenon.
The wave function implies that the photon has preexisting information regarding the space through which is travelling and in theory, the wavefunction could have even orbited around Jupiter (with some small probabilities bias to the detection of such an influence) before being detected.
Notice also that gravity can't travel at light speed if we can detect black holes because it would be a paradox that gravity would contain light but not itself, which should be moving at the same speed.
According to my views, matter and gravity arise from a chaotic diffusion of energy into space and this would also mean that gravity would not possess the same coherent wavelengths that light possess and so far my view has been right - still no gravity waves have been detected as predicted by Relativity. (In my model, the Earth is expanding outward and accelerating you - you're similarly expanding/diffusing and pushing back slightly, though the relative scales remain approximately constant and scales of size are also a form of relative measurement that Relativity seems to have overlooked. The Moon similarly expands and moves laterally and spirals away from the Earth, but because our "rulers" are also increasing in size, this rescales space (making it appear to be contracted or "warped") and the Moon to appearing to be at a constant distance and size - though a slight motion away from the Earth is detected - but it would be spiralling away and appearing similar to spread of spiral arms in a galaxy)
Also, consider that Relativity is actually an ether theory - it requires a medium called "vacuum" through which light propagates and this medium needs to be synchronized in time throughout the visible universe, hence a faster than light manner to maintain disparate events needs to exist. I consider this to be the photon - though it's effectively a Tachyon as well - it all depends upon the context of how it is measured.
Well, "light" in Relativity is referring to the coherent wave component of photon detections and in that sense, yes, light exists in an equivalent space constructed by its own properties, but this is not the same as the velocity of the photon.Also I have learned that even gravity waves travel at the same speed and that space-time warps in order to accommodate this limiting factor. Now if light photon can travel at infinite speed, how do we explain the warping of space-time?
Pleasant
Notice that in order to have space warped, there needs to be something to warp it relative to. There would be no manner to measure any sort of bias unless we had an unbiased version of space detectable as well and you need a faster than light mechanism to communicate these shorten/bent distances.
For example, the waves in the ocean deform the surface of the water, but this deformation moves at a slower rate than the acoustic and electromagnetic properties of water (which can be thousands of miles per hour). This faster manner of communication is necessary to maintain the more macroscopic features of waves. This is a common theme in physical properties - a faster communicating phenomenon constructs events on larger and slower scales that are qualitatively different (for example subatomic particles must move faster than an atom can, as an atom requires that interactions between these subatomic particles occur at its location - similarly space itself needs to communicate virtually instantly in order to assure that a medium in which subatomic particles can interact and this is basically what the search for the Higgs field is in regards to).


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