Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > sci.physics.relativity > #399512
| From | Steven Carlip <carlip@physics.ucdavis.edu> |
|---|---|
| Newsgroups | sci.physics.relativity, sci.physics |
| Subject | Re: This is your guru |
| Date | 2016-11-23 10:46 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <o14o3d$ms7$1@dont-email.me> (permalink) |
| References | (13 earlier) <o0v276$44d$1@gioia.aioe.org> <o10d8g$86o$1@dont-email.me> <o1179k$1f4h$1@gioia.aioe.org> <o13ekb$5vp$1@dont-email.me> <o1462n$3e7$1@gioia.aioe.org> |
Cross-posted to 2 groups.
On 11/23/16 5:37 AM, Dusty Kollman wrote:
> Steven Carlip wrote:
>> Gravity is a little more complicated -- it takes more than one number
>> ("how much light") to describe spacetime curvature, and there are
>> conservation laws that come in, so you get things like quadrupole
>> radiation and velocity-dependent effects. But the basic idea is the
>> same.
[...]
> In spite of what you said is pretty much consistent, I'm not convinced. As
> you say, light shadows are not a one-to-one analogy. The point is that it
> is about the geometry/projection, not the shadow.
Good. You shouldn't be convinced by an analogy -- you should just take
it as a starting point for learning more.
The simplest next step is electromagnetism rather than gravity.
There's a beautiful quantitative description of how the field of a
moving charge "separates" from the charge in Purcell, _Electricity
and Magnetism_, section 5.7. This is very close to my description
of what happens with the shadow of a moving object, but it has all
of the details.
For gravity, as I said, it's more complicated, especially since the
field equations are nonlinear. You can find a derivation of the
linear approximation in any GR textbook, and if you compare to
Purcell, you'll see that the description is very similar. Once
you really understand this, it might be fun to do a more direct
analogue of Purcell's argument. This should be possible by using
the Kinnersley metric (you can get a start by looking at my paper
at https://arxiv.org/abs/gr-qc/9909087).
Steve Carlip
Back to sci.physics.relativity | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
This is your guru mlwozniak@wp.pl - 2016-11-16 00:09 -0800
Re: This is your guru Melzzzzz <mel@zzzzz.com> - 2016-11-16 10:52 +0100
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 02:41 -0800
Re: This is your guru Melzzzzz <mel@zzzzz.com> - 2016-11-16 11:43 +0100
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 03:49 -0800
Re: This is your guru Melzzzzz <mel@zzzzz.com> - 2016-11-16 13:18 +0100
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 04:48 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-16 21:54 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 23:19 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-16 23:32 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 23:38 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 00:14 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-17 00:38 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 10:37 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-17 22:36 -0800
Re: This is your guru Tom Roberts <tjroberts137@sbcglobal.net> - 2016-11-16 10:26 -0600
Re: This is your guru Kieth Staudt <KiethS@StaudtInstitute.info> - 2016-11-16 18:12 +0000
Re: This is your guru Melzzzzz <mel@zzzzz.com> - 2016-11-16 19:28 +0100
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-16 21:57 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 23:34 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 00:23 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-17 03:37 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 10:39 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-17 22:50 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 23:52 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-18 00:53 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-18 12:28 -0800
Re: This is your guru Maciej Woźniak <mlwozniak@wp.pl> - 2016-11-19 10:07 +0100
Re: This is your guru Marion Vanriper <Marion@Vanriper.info> - 2016-11-26 09:30 +0000
Re: This is your guru Tom Roberts <tjroberts137@sbcglobal.net> - 2016-11-17 10:09 -0600
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-16 12:11 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 23:14 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-16 23:35 -0800
Re: This is your guru mlwozniak@wp.pl - 2016-11-16 23:52 -0800
Re: This is your guru JanPB <filmart@gmail.com> - 2016-11-17 00:25 -0800
Re: This is your guru paparios <paparios@gmail.com> - 2016-11-17 03:59 -0800
Re: This is your guru "Dan S. MacAbre" <no@way.com> - 2016-11-17 12:12 +0000
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-18 05:07 +0100
Re: This is your guru "Dan S. MacAbre" <no@way.com> - 2016-11-18 10:02 +0000
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-18 22:13 +0100
Re: This is your guru "David (Time Lord) Fuller" <fuller.david@hotmail.com> - 2016-11-18 21:46 -0800
Re: This is your guru "Paul B. Andersen" <relativity@paulba.no> - 2016-11-19 09:30 +0100
Re: This is your guru Tom Roberts <tjroberts137@sbcglobal.net> - 2016-11-19 10:01 -0600
Re: This is your guru "David (Time Lord) Fuller" <fuller.david@hotmail.com> - 2016-11-19 08:07 -0800
Re: This is your guru Norberto Haman <norberman@norberman.info> - 2016-11-19 16:37 +0000
Re: This is your guru Steven Carlip <carlip@physics.ucdavis.edu> - 2016-11-20 09:37 -0800
Re: This is your guru Norberto Haman <norberman@norberman.info> - 2016-11-20 20:32 +0000
Re: This is your guru Steven Carlip <carlip@physics.ucdavis.edu> - 2016-11-20 15:54 -0800
Re: This is your guru Maryann Tonn <libradaz@libradazert.info> - 2016-11-21 15:00 +0000
Re: This is your guru Steven Carlip <carlip@physics.ucdavis.edu> - 2016-11-21 19:16 -0800
Re: This is your guru Maryann Tonn <libradaz@libradazert.info> - 2016-11-22 10:39 +0000
Re: This is your guru paparios <paparios@gmail.com> - 2016-11-22 03:16 -0800
Re: This is your guru Maryann Tonn <libradaz@libradazert.info> - 2016-11-22 11:24 +0000
Re: This is your guru Ned Latham <nedlatham@woden.valhalla.oz> - 2016-11-22 12:13 +0000
Re: This is your guru benj <benj@nobody.net> - 2016-11-22 17:37 -0500
Re: This is your guru Steven Carlip <carlip@physics.ucdavis.edu> - 2016-11-22 22:57 -0800
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 13:37 +0000
Re: This is your guru paparios <paparios@gmail.com> - 2016-11-23 06:04 -0800
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 14:27 +0000
Re: This is your guru paparios <paparios@gmail.com> - 2016-11-23 06:44 -0800
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 14:56 +0000
Re: This is your guru Steven Carlip <carlip@physics.ucdavis.edu> - 2016-11-23 10:46 -0800
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-23 23:21 +0100
Re: This is your guru Bob Goodman <bobg@boobgodman.info> - 2016-11-23 22:58 +0000
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-25 20:00 +0100
Re: This is your guru Bernardo Dearmond <bnard@dearmond.org> - 2016-11-25 21:46 +0000
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-25 22:56 +0100
Re: This is your guru "David (Lord Kronos) Fuller" <fuller.david@hotmail.com> - 2016-11-23 20:13 -0800
Re: This is your guru Odd Bodkin <bodkinodd@gmail.com> - 2016-11-23 09:24 -0600
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 15:33 +0000
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-23 23:23 +0100
Re: This is your guru "David (Lord Kronos) Fuller" <fuller.david@hotmail.com> - 2016-11-23 20:15 -0800
Re: This is your guru Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-11-25 20:05 +0100
Re: This is your guru "David (Lord Kronos) Fuller" <fuller.david@hotmail.com> - 2016-11-25 14:57 -0800
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 18:28 +0000
Re: This is your guru Poutnik <poutnik4nntp@gmail.com> - 2016-11-23 19:37 +0100
Re: This is your guru Dusty Kollman <uberdriver@uberdriver.info> - 2016-11-23 18:39 +0000
Re: This is your guru "David (Lord Kronos) Fuller" <fuller.david@hotmail.com> - 2016-11-21 22:40 -0800
Re: This is your guru Tom Roberts <tjroberts137@sbcglobal.net> - 2016-11-19 10:47 -0600
Re: This is your guru Norberto Haman <norberman@norberman.info> - 2016-11-19 17:20 +0000
Re: This is your guru mlwozniak@wp.pl - 2016-11-17 04:37 -0800
csiph-web