hey guys i just saw a weirdo on TV claiming that the speed of light is not constant......since that is a direct attack on Einstein's postulate of relativity is there any truth in that statement?
If the speed of light were different for different observers, that would affect the theory of relativity as it is based on the fact "c" is constant, time and distance are variables. This has lots of experimental verification...at least indirect but generally overwhelming evidence.does different speeds of light in different times of our history have any effect on the theory of relativity?does the theory of relativity have any experimental findings against it?
Relativity has well known theoretical faults: It doesn't work at the big bang and black hole singularities...neither does quantum mechanics...that's how we can tell neither is entirely correct. Relativity has no experimental contradictions...nor does quantum mechanics...the former is good at macroscopic scales, the latter at microscopic scales........ Maxwell's equations.....predict that the speed c with which electromagnetic waves (such as light) propagate through the vacuum is related to the electric constant ε0 and the magnetic constant μ0 by the equation c = 1/√ε0μ0
On rereading that question, I now think it meant has light speed varied over the history of the universe and would that affect relativity....."c" is a constant in the Einstein Field equations.....so depending on what you were studying, yes it would change solutions.does different speeds of light in different times of our history have any effect on the theory of relativity?does the theory of relativity have any experimental findings against it?
does the book have any thing to do with tachyons?Perhaps you encountered something from Joao Magueijo, a for real Physicist, who has done some speculations by treating c as if it were a function of time. He has written an interesting and readable book about his experiences with this speculation:
Faster then the Speed of Light
If you have time give it a read.
If the speed of light were significantly different during some interval well after the Big Bang then shouldn't chemistry, ultimately an electromagnetic phenomena, be different as well? I'd be surprised if the world can be what it is now with different chemical behavior...I am unsure if the speed of light did change over history how we would detect it, but I suspect there are ways...the cosmic background radiation for example comes from some 13.3 billions years or so ago (about 380,000 years after the bang) and seems 'consistent' with "current" light, say as from our sun....