[Navraj Sikand (OP)]

   The reason for my theory   Whenever we try to measure the speed of light mass bends the fabric of spacetime and cause the light to slow down or speed up the speed of light.no matter where ever we go in the emptiness of space to measure it our answer will still be wrong as the empty space isn't empty at all as it is filled with dark matter and dark energy that are even more massive than normal matter. At the end I will like to say that this theory does not violate any laws of physics and Albert Einstein's Theory of Relativity as light speed still might be the fastest and the maximum speed an object or a particle can ever achieve as this theory only states that our 'understanding' of light speed might be wrong it can be even faster or a bit slower than what we understand about its speed now.

[Colin2B]

Your poll does not contain enough options to return a meaningful data set.
An observer in a gravitational field will measure the speed of light at a remote location, having a different gravitational potential, to be different from that measured locally. But the local measurement at any location or gravitational potential will always be the same - 299,792,458m/s.

[jeffreyH]

The speed of light being constant and of the same value in all inertial reference frames is the ultimate triumph of special relativity. To even attempt to question its validity requires a level of scientific knowledge that the layman generally lacks. Just stating it may be so without any supporting observations is naive.

[evan_au]

Is our understanding of the speed of light (299,792,458) metres per second wrong?

In my work, I use a figure of 5ms/1000km. This comes out as 200,000,000 m/s.

This is because I deal with infra-red light propagating through silica glass fibers. Due to the refractive index of glass,light travels considerably slower in optical fiber than 299,792,458 m/s (the number which physicists label as the constant c).

c is only correct in a vacuum, but it is correct for fast-moving observers or slow-moving observers, in strong gravitational fields or weak gravitational fields. This is why it's useful to define it as a constant. The constant c also pops up in many equations in physics, as many physical phenomena depend on it.

Einstein provided equations that let you calculate what a different observer would see - and the constant c also pops up in these equations.

Quantum theory imagines "virtual photons" which (for a short time) could travel faster or slower than c. And we still don't really know what happens at the event horizon of a black hole where the escape velocity is equal to c - or inside the event horizon, where our usual concepts of time (seconds) and space (meters) get scrambled.

[yor_on]

'c' is 'c'.
It's defined as a constant

Try this.. math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_of_light.html

One important thing though, is that it is a 'local' constant. But so is everything you measure, it's locally done. So now you have to decide, either those local observations, when compared and found to be true for all local measurements, consist of a true description of the universe, or they lie. If you think them lying you will have to find a totally new way of explaining why your computer works at all.

[xersanozgen]

The speed of light being constant and of the same value in all inertial reference frames is the ultimate triumph of special relativity.

Well-directed/intentive phrases has importance for life and science and esğecially physics. Correct sentence would must be that:

The velocity of light is measured always the value ' c ' in all reference frames due to current measurement experiment.

 


"to measure" is just the experimental reality and action. To interpret this result as a single meaning (light's local  relative speed) is a humanly defect. There may be other options else: we can measure the velocity which is relative merely according to most external frame not acccording to other local/medium  frames. the isotropic quality of measurements and specify of measurement experiment (mirrored double path, uninterupted light etc) indicates/supports this interpretation.

[yor_on]

Sure, we can pick any frame we like, then define the speed from that. That is a cerebral gymnastic showing how we might like it to be. But the way to do a measurement is locally. When those local interpretations are found to agree with each other we get to a repeatable experiment. Those experiments built the curriculum your school introduced to you. And whatever else you use in your daily life, as your car.

[xersanozgen]

Sure, we can pick any frame we like, then define the speed from that. That is a cerebral gymnastic showing how we might like it to be. But the way to do a measurement is locally. When those local interpretations are found to agree with each other we get to a repeatable experiment. Those experiments built the curriculum your school introduced to you. And whatever else you use in your daily life, as your car.

If we wanted to measure the relative velocity of light according to space or outmost  frame we would set the present measuring experiment  and we would label the result as  "universal velocity". Then we may proceed to understand/use the results of other sub local measurements by this same meaning. This attitude would be correct.

First Galilei event indicated that an observation from local/relative position will can be wrong. We could had generated a significant principle of methodology: outer frames must be preferred in analyses as far as possible.

For light kinematics outmost frame (space) is present / possible and easy.

Einstein had considered/prioritized universal scale for physics events. However he could not overcome anthropocentric habits. But, we can perform.

If we assign and use the space as co-reference frame for light kinematics, the cosmological analyses can be possible by classical/Galilean relativity (second Galilei event) *. As known, The theory SR doesnot allow the cosmological analyzing because of non-simultaneity data.

(*) http://adsabs.harvard.edu/abs/2013PhyEs..26...49E