Recent content by publius

Yes, that is something I'm not clear on at all. Do you "feel" your own gravitational radiation reaction or is it just a perturbation of your geodesic that you don't feel? -Richard

You're most likely right, it is someone's "partisan" opinion, but it sure got put in my head. I think it stems from the real gravity = curvature school, and trying to ordain that tides to inertial (and zero Fermi-Walker derivatives) observers are the defining characteristic of curvature...

Pervect, I was corrected once, either by someone directly or by something I read, I can't remember which, that the term "tides/tidal forces" were absolutely reserved for that experienced by inertial observers, and so "tides" were a feature only of curved space-time, etc, etc. That...

Again, forgive the new poster from jumping in, but I don't think I'd call the Rindler frame gradients "tides". As I understand it, "tides" are reserved for that experienced by free-fallers/floaters due to real curvature of space-time. If you're in Rindler frame, any free-fallers you...

See this paper by Steve Carlip: http://arxiv.org/abs/gr-qc/9909087 This was a response to some of Tom Van Flandern's "stuff" the "speed of gravity". Carlip explicitly shows that GR gravity "extrapolates" motion to the second order, taking acceleration as well as...

Oh, here's something related to this, a couple of papers by Wolfgang Rindler himself and others and gravitational lensing in SdS: http://arxiv.org/abs/0709.2948 http://arxiv.org/abs/0710.4726 Rindler says there was a misconception about gravitational lensing...

DOH! That's right, it's squared, and would nicely expand to 1 +2gz + (gz)^2, giving us the 1 + 2Phi part for small gz, indeed. I forgot all about the squaring, there. Sorry about that. -Richard

Lambda Warp Drive... Here's an interesting paper, http://arxiv.org/abs/0712.1649 It's about "locally manipulating lamdba" to get something similar to the Alcubierre warp "bubble". I love wild stuff like this...

Pardon me for jumping in here, but since you all were so nice the last time, this brings something up about this g_00 = 1 + 2Phi(/c^2 if we're not using c = G = 1). As I understand it, that holds in the "weak field" limit, and if I were comparing clock rates say in the solar system, I could use...

Yes, that's me, warts and all. :) -Richard

How fast a battery will charge depends on much voltage you apply (and there's a limit there, IIRC, too much current and you're basically just electrolyzing the water -- that happens especially when the battery is near fully charged and is the bubbling you see). If your source can't pump the...

Forgive a long time luker, but relatively new poster from jumping here. I was here for something else and saw this topic which caught my eye and here I am. A caution. Many of these newer portable generators are not your simple "analog" AC sychronous machines. Many are actually an AC...

Too advanced? Nah, I understand it all perfectly. Like I do brain surgery -- give me a call if need me to poke around your noggin. I'm cheap. Seriously, my education is just a B.S in physics, and of late, I got interested in GR and have been sort of knocking around with the concepts, just for...

Again, thank you all for taking the time to respond here. It is much appreciated, and given me a lot to chew over. -Richard

Thanks for the welcome -- glad to be here, long time lurker, first time poster and all that -- and thanks for the replies. So Chris above is one of the authors of the Wiki GR articles -- I always thought many of those were pretty good. I'm far from that level of understanding, but I...