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  1. Replies
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    Assume we can neglect air resistance, and that...

    Assume we can neglect air resistance, and that the rock moves in a uniform downwards gravitational field of strength 9.8 m/s2. Proceed in the standard way, as x0x seems about to try, and resolve the...
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    I'd like to start by recommending the referee's...

    I'd like to start by recommending the referee's comments (starting on page 527). Its subject matter completely aside, the paper has serious issues.

    That said, the answer to your question is that...
  3. Thread: Resignation

    by btr
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    I just heard. I hope it isn't too late to say...

    I just heard. I hope it isn't too late to say that I'm very sorry to see you leave, Markus, and to offer hearty congratulations on the birth of your new grandchild!

    Take care,

    -btr
  4. The problem is that when it comes to the...

    The problem is that when it comes to the particular metric I posted above, we still need to establish whether the light can or can't get out of some region or other. As yet, we don't know anything;...
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    I can do the calculation for you if you want.

    I can do the calculation for you if you want.
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    Unfortunately, to continue discussion with you,...

    Unfortunately, to continue discussion with you, I'd have to at least believe that you believed in your claims. However, as erroneous as some of your previous posts have been, I still cannot bring...
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    I'm still waiting for your explanation on this...

    I'm still waiting for your explanation on this point, x0x:



    You do realise that it's wrong, surely? I mean, the fact that it predicts a finite return time for a signal bouncing off an object...
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    It's entirely up to you.

    It's entirely up to you.
  9. Replies
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    You said neither Rindler nor Will are crackpots...

    You said neither Rindler nor Will are crackpots that would appeal to the "varying (coordinate) speed of light" in their explanations. Since Rindler quite clearly refers to the notion of the...
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    (See the correction to my earlier post, due to...

    (See the correction to my earlier post, due to misreading your claim slightly.)

    Blowing up is the correct answer. If a photon is emitted from an object which is exactly on the event horizon (at...
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    At the start of section 11.7, Rindler points out...

    At the start of section 11.7, Rindler points out that in isotropic coordinates "the coordinate speed of light direction-independent", and uses this fact to simplify his derivation of the time delay....
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    No worries - I already fixed your error for you....

    No worries - I already fixed your error for you.



    Yes, expressing the physical fact that if you try to bounce a radar pulse off something on the event horizon, you'll be waiting a long time for...
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    What puzzles me is that Rindler's text was simply...

    What puzzles me is that Rindler's text was simply a terrible example for someone to choose, if they hoped to illustrate that the Shapiro delay could be computed without using the variable coordinate...
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    That's incorrect, I'm afraid (which is quite...

    Frankly, based on your earlier errors, I don't think you have a clue:

    \tau_{12}=2|\int_{r1}^{r2}{dr \sqrt{\frac{r}{2m}}|[/QUOTE]

    That's incorrect, I'm afraid (which is quite amusing in light of...
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    If you really want to go on acting as though...

    Rindler integrates dt as a variable of x along the geodesic path. This is what basic calculus says. You can stop trolling now and go take care of your earlier errors. You have no standing to give me...
  16. But surely there must be some objective way to...

    But surely there must be some objective way to determine the answer, otherwise we're just left with individual opinions (which would be a very clear signal that the theory is incomplete). Here's a...
  17. Thread: Editing posts

    by btr
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    Thank you, Markus.

    Thank you, Markus.
  18. I see this as two questions: (1) does the local...

    I see this as two questions: (1) does the local speed of light actually vary (from what I think you might call a "God's eye view"), and (2) could we objectively improve our present physical theories...
  19. I know. I didn't go into details on the...

    I know. I didn't go into details on the definition of the second, as it wasn't the focus of my post.



    The definition of the metre is based on the physical assumption that the locally-measured...
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    It's just an illustrative toy example, one among...

    It's just an illustrative toy example, one among many, of an expression which is rotationally symmetric, but with a minimum that's not at the origin. There exists a particularly simple scalar field...
  21. Thread: Editing posts

    by btr
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    I use Chrome on a Linux desktop and an Android...

    I use Chrome on a Linux desktop and an Android phone, and have the same issue as KJW (post #3) with replying to posts on both platforms.

    No-one knows the answers to my questions in the OP, I take...
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    As I recall, the original "pilot wave" idea is...

    As I recall, the original "pilot wave" idea is indeed not Bohm's, but rather due to de Broglie; however, it was Bohm who actually developed it into something capable of handling multiple particles,...
  23. Don't worry about what it's called; just see if...

    Don't worry about what it's called; just see if you can figure out the physics starting purely with the metric. Or at least, think about how you would do so.
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    I recall that we recently had a discussion about...

    I recall that we recently had a discussion about this, on SciForums: The screw nature of electromagnetism

    I asked you (here) to see if you could construct diagrams like your "radial lines +...
  25. Thread: Editing posts

    by btr
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    Editing posts

    More a question than feedback, I suppose.

    What are the edit time limits in the software set to? As I understand it, there's one limit within which you don't get the "last edited by..." notice,...
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