The constant speed of light is valid in the special relativity, but when we consider the a general relativistic metric according to the principle of equivalence, the possibility of the variation of the speed of light may not be ignored if it demanded to justify a property of the the gravitational field. The only problem is then arises is to modify the electromagnetic field equations on the basis of the variable speed of light with the requirement that the field equations reduces to the field equations of the special relativity when the speed of light tends to constant..
Usually from energy considerations,locally, you consider
a variation in the frequency of light, but not in the speed,
as long as the medium is vacuum and not material.
ie, the case of gravitational red shift.
https://www.academia.edu/38373675/Creation_of_a_Quantum_Mechanic_Universe_and_its_Rotation.doc
The Universe has billions of galaxies, the Big Bang theory, GTR, STR are designed for one galaxy. The GTR is not even working in our solar system. best
Dear J.Weisz and J.Fardaei,
I am unable to understand any relation to my question with your answers.
Regards
If you ask if the speed of light in vacuum differs from c,
I said no, what adjusts is the frequency of light, according to the gravity. OK?
pd. speed is a locally defined quantity.
Dear Ramesh, I should be out of this discussion , because I rejecting the whole GTR. I am presenting a Quantum Mechanics Universe, which I send you the copy. A photon is a light and it is traveling ( C- + who care), it has nothing to do with anything, except feeding atoms. This is my perspective of photon, which sun-hydrogen is producing it that is all. I am going to Quantum Physics seminar, France, to present the Quantum Mechanics Universe. I just don't understand, why we are so much concern on a mechanical, and accidental, big bang theory that originally was pronounced for a flat one galaxy's universe. best
Dear J.Weisz
I agree that the speed of light is invariant in vacuum. This is the basis of the formulation of the special relativity leading to the Minkowskian space-time.The general theory of relativity is based on the Reimannian space-time which is locally a Minkowskian space-time. Here, we come across a number of possibilities of defining the variability of constants for different reasons. For example, the cosmological constant and the gravitational constant. We never thought to consider the variation of the speed of light. It is because of the special relativity,which is based on the constant speed of light. This property is the outcome of the Maxwell's equations where the speed of light is a constant.
My question is that if we consider variable speed of light in a Reimannian space-time such that locally the Reimannian space-time reduces to Minkowskian space-time when the speed of light will also be reduces to constant then, is there any mistake? The only modification according to my knowledge ,one has to make is the modification of the formulation of the Maxwell's equations in general relativity on the basis of the variable speed of light with the limit that when the speed of light is a constant, the Maxwell's equations reduce to its original form.
Regards
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