Recent content by gtw

Thanks, that is an interesting effect. I'll look it up. Perhaps the "speed" of the light was slow enough that it was below relativistic speeds but still showed "relativistic" properties rather than Newtonian. This is all for my own edification. The notion of time dilation is easy to accept...

Good point. I have never seen that mentioned. Simply the extension in the x direction.

Thanks. Someone treating all of this as being a crank. I read sr only works for inertia states. Perhaps it just has nothing to say for this situation. (Can it be restated using angular velocity and put into the sr equations?) It seems always that the clocks need to be adjusted at the turnaround...

I didn't repeat it, that's why I didn't cite it originally. Actually, when I started looking into this, I had no idea so much "nonsense" was out there. Sometimes when you are searching for something using keywords, this is what you get. Some are presented with lots of math purporting this or...

I was looking at the Twin Paradox where the stationary Twin is older than the moving one upon reuniting. However, if they are both moving in opposite directions,(out and then back) the relative speeds would be the same as in the normal example. I would imagine they would be the same age when...

I just read the Michelson-Morley experiment in some detail. It seems to me that the mirrors could be considered to be light emitters in sequence. Since the reflected light is opposite to the generated light why couldn't this simply be a null experiment in the absence of ether? I just thought...

Didn't that just disprove any ether or global frame of reference? The source and receiver were fixed relative to one another so that wouldn't apply would it? I know that some of these questions come off rather basic, but I am unable to find experiments trying to find a variability in light...

I was reading about the Twins Paradox. How about this formulation? At some time t, two objects pass one another at relavistic speeds, go apart for some period of time and observe each other. The other appears to have less time passing relative their own frame of reference. They come back...

I have been searching the net for measurements and how they are done of the speed of light. For some reason, I don't find much on them. I see sites promoting various theories whether sped up or down or is not constant. Claiming prehistorical differences in the speed of light is unverifiable I...

Thats <crank link deleted>.

I simply remarked I was surprised at the expense. I was not expecting it to be a textbook when first directed there. Also I mentioned I read that it did not have answered questions. It is currently in my amazon basket along with Newton's Principia Mathematica , etc. It been a while since I have...

Do you of any books with solutions for D'Inverno? The amazon site says it is too bad the problems are not solved. Not an inexpensive book. True, but a good place to start, but not end. People try to make it better. And many of the articles have links to stable data. I understand that...

I think that blanket statement needs a little elaboration. These philosopher's were clearly bright people. They lived in a period where experimental science and that ethos were just forming. Also mainly they were clerics of some sort. That said, they were taking Greek philosophy forward...

I looked at The Ball is Round. It makes a little mention of the difference in time it takes for light at the back of the ball to reach the observer vs. the time at the front. Thus even without sr, a ball will be elongated because at a point in time the visible back of the ball will be further...

What level of math is assumed in D'Inverno relativity book? Tensor calculus or below? No, Mercury. It was the first real world proof of Einstein's theory. Wkipedia: Tests of Einstein's general theory of relativity did not provide an experimental foundation for the theory until well...