Talk:Sine-Gordon equation

Untitled
discussion of the significance and physical interpretation of the sine gordon model would be useful for non technical readers. and perhaps... even technical readers. as of yet, there is just a description of the terminology, but not why the theory is interesting, or who developed it.Wilgamesh 16:34, 22 October 2005 (UTC)

I will try to update the article in the next few days. I think the elastic ribbon visualizations released by me in the public domain will be of help for nonspecialists interested to get acquainted with the soliton concept. Danko Georgiev MD 14:18, 15 January 2007 (UTC)

The animations of various soliton solutions of the sine-Gordon equation are very nice, though a bit mysterious with all the arrows and twisting matter -- we cannot assume the reader is familiar with Dodd's elastic-ribbon analogy. More importantly, many browsers (e.g., Firefox on *nix) get overwhelmed when that many GIFs have to be rendered simultaneously. Perhaps there is a way to make it so they aren't animated until the reader clicks on them? Evilmathninja 22:57, 22 January 2007 (UTC)

And on a slightly different note: the convention in the literature is to include a -1 in the Lagrangian density, which of course doesn't change anything, but assures that the Lagrangian (the integral of the Lagrangian density over all of space) will converge. Then, that also improves the analogy with the Klein-Gordon Lagrangian density, as there is no longer the need to subtract 1 from the sine-Gordon Lagrangian density. Just a thought. Evilmathninja 23:06, 22 January 2007 (UTC)
 * Hello, the animations are produced by Maple 5.0, and I am not a specilaist in animations, so I don't know what should I do to edit them in the way suggested by you. They are released under GFDL license, so anyone who knows what to do, can edit the animations any way he/she likes. See also the pendulum model, and the plain 2D model at Miroshnichenko's web. By the way I use almost exclusively Wolfram's Mathematica 5.2, that is why the algorithms for Maple are not written by me but by Miroshnichenko and colleagues. Regards, Danko Georgiev MD 02:14, 5 February 2007 (UTC)

Unauthorised use of computer-manipulated images
The images and content inserted onto this page by User:Danko Georgiev MD have been removed. They were a very slightly modified version of work by Andrey E. Miroshnichenko to be found here. The colouring and time direction of the gif images had been computer-modified, but this does not alter the fact that these images were plagiarized without the permission of the original authors. Some explanation available in the original article had not been included by User:Danko Georgiev MD which explains why the images might have appeared mysterious. Plagiarizing images and content in this way seems entirely against the spirit of WP. I found the original images on google images by searching for kink and antikink where other moving images were also available. User: Danko Georgiev MD has indicated in the WP image files that he created the images from scratch: this does not seem to be the case. --Mathsci 05:09, 23 June 2007 (UTC)


 * I don't see any evidence of plagiarism. The images look similar, but unless you can provide evidence that "the colouring and time direction of the gif images had been computer-modified" and not simply recreated from scratch, you should not remove the images. – Quadell (talk) (random) 00:56, 25 June 2007 (UTC)


 * The evidence is written in the last paragraph of the previous section if you read it carefully. Danko Georgiev claims that his image was generated using the maple files of Miroshnichenko which he himself confesses he is unable to modify. Thus he himself tells us where the original image came from, but he has not explained in detail on the image file why and how he has received permission from Miroshnichenko to use the images or the original maple files wherever they are. --Mathsci 02:07, 25 June 2007 (UTC)

Dear User:Mathsci, source codes by Miroshnichenko can be used from everyone to input the source code in Maple and then get the images. Also for your information I have already discussed some issues with Andrey Miroshnichenko, and although I did not agree with the correctness of some plots concerning kinks and antikinks and their proper definition in the ribbon model, we are in perfectly good relations and if you see, I HAVE ADDED LINK TO MIROSHNICHENKO'S SITE MYSELF -- http://homepages.tversu.ru/~s000154/collision/main.html AND ALSO IF YOU BROWSE A LIITLE IN THE MIROSHNICHENKO'S MAIN PAGE YOU WILL FIND THE EXACT TEXT: Test examples: A.E. Miroshnichenko, A.A. Vasiliev, S.V. Dmitriev A Maple package for the derivation of multi-soliton solutions to the sine-Gordon equation using the Backlund transformations.

Link: Danko Georgiev Solitonic effects of the local electromagnetic field on neuronal microtubules – tubulin tail sine-Gordon solitons could control MAP attachment sites and microtubule motor protein function. Cogprints 2004, 3894; D.D. Georgiev, S.N. Papaioanou, and J.F. Glazebrook Biomedical Reviews 2004.

I have not plagiarized anything, Miroshnichenko himself added links to my work on his web site, and if he had expressed any concerns about copyright violations, he would have informed me, so that I could immediately resolve the problem. His work is widely quoted by me, and in the last 3-4 years me and prof. James Glazebrook have worked extensively on sine-Gordon models in neurobiology. So dear User:Mathsci You have posted FALSE accusations in plagiarism for THIRD time, agaqinst me, please stop this farce. You even have not appologized for the previous two times, the first one, you have accused me of plagiarizing my own text, without even knowing that the original text is written by me also. Kind regards, Danko Georgiev MD 03:16, 25 June 2007 (UTC) p.s. Striking example of gif not present in Miroshnichenko's web is the ANTIKINK model. The source was programmed exclusively by me. The dialogue between me and Miroshnichenko was in my concern that time inversed kink, remains kink, and does not become antikink. In some of Miroshnichenko's animations -- exactly here http://homepages.tversu.ru/~s000154/collision/ribbon/ribbon3.html#MapleAutoBookmark3 The captions are ERRONEOUS -- the kink is represented clockwise twist, but it is written to be counterclockwise, the inverse holds for antikink. If you want to know where is the error read by introductory entry on right handed coordinate systems, in Invited chapter for ELECTRONEUROBIOLIGIA -- then read the definition for positive direction of countour, and positive direction of normal to given surface. Danko Georgiev MD 03:29, 25 June 2007 (UTC)

There appears to be some graffiti on the page. —Preceding unsigned comment added by 128.230.195.113 (talk) 18:25, 10 July 2008 (UTC)

Typesetting
The TeX code:
 * a_{\textrm{Gordon}} \,
 * a_{\mathrm{Gordon}} \,
 * a_\text{Gordon} \,
 * a_\text{Gordon} \,

The results:
 * $$ a_{\textrm{Gordon}} \, $$
 * $$ a_{\mathrm{Gordon}} \, $$
 * $$ a_\text{Gordon} \, $$
 * $$ a_\text{Gordon} \, $$

I changed to the third version within this article. No nested braces –, and I think there's something to be said for simplicity. Michael Hardy (talk) 04:50, 18 February 2009 (UTC)

Correct Capitalization?
What is the correct capitalization of Sine-Gordon? I ran into this from the Topological quantum number page. All the instances seem to have a lower-case "S" and capital "G" - except for the page title, but I read somewhere that that's a WikiMedia limitation. The math is way over my head, but my impression is that "sine" refers to the trig/(other kind of "sine"?) function, not a person. I'm sure this happens in other places as well - a type of a particular function that happens to be named after it's discoverer for instance. Is there a "standard" naming convention? I was going to "correct" this on the other page, but I left all the capitalization alone (as above) after seeing the apparent convention here. Jimw338 (talk) 16:33, 19 June 2013 (UTC)


 * Lower case is correct, but it's OK that the title has an initial capital. Dicklyon (talk) 06:09, 17 June 2014 (UTC)

Requested move

 * The following discussion is an archived discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review. No further edits should be made to this section. 

The result of the move request was: page moved. Armbrust The Homunculus 14:07, 24 June 2014 (UTC)

Sine–Gordon equation → Sine-Gordon equation – I'm not sure what's right here, but it's worth discussing: If the name sine-Gordon is a pun on Klein–Gordon, does it inherit the en dash from that parallel combination of names, even though sine and Gordon are obviously very non-parallel? Or should it be sine-Gordon, like sinh-Gordon, as more like an ordinary compound used as a modifier? Dicklyon (talk) 06:08, 17 June 2014 (UTC)
 * Rename. Very interesting case here. I think we could get away with either, but I simply prefer the latter interpretation of this. Good Ol’factory (talk) 01:15, 20 June 2014 (UTC)
 * The above discussion is preserved as an archive of a requested move. Please do not modify it. Subsequent comments should be made in a new section on this talk page or in a move review. No further edits should be made to this section.

asymptotic lines parameterized and Chebyshev coordinates
I'm not a specialist but, it seem's to me that, it is not right that, every asymptotic line parametrization has the form


 * $$ ds^2 = du^2 + 2\cos\varphi \,du\, dv + dv^2,\, $$

but rather that this is the definition of Chebyshev coordinates. — Preceding unsigned comment added by 130.60.188.209 (talk) 14:11, 4 July 2014 (UTC)

Surfaces of constant negative curvature not always a pseudosphere
In the introduction there is a link named "surfaces of constant negative curvature" that links to pseudosphere

But there are many more surfaces of constant negative curvature: (see for example http://virtualmathmuseum.org/Surface/gallery_o.html#PseudosphericalSurfaces )

Three surfaces of revolution:

Pseudospherical Surfaces of the parabolic type (this is the tracioid or pseudosphere)

Pseudospherical Surfaces of the hyperbolic type

Pseudospherical Surfaces of the elliptic type (called the conic type at the virtual math museum) Other surfaces of constant negative curvature: Dini surface (and i think this page is mostly about variations on the dini surface

and the breezers, and others that are named on this page

what to do now? (PS I am not an expert in this field, nor on wikipedia) WillemienH (talk) 10:08, 16 September 2014 (UTC)

Who is "Gordon"? Whom is it named after?
Equinox ◑ 05:58, 1 April 2023 (UTC)


 * The "Gordon" is Walter Gordon. The name comes from a physicist's 'joke' as the equation is similar in form to the Klein–Gordon equation $$\square\varphi^2 = \varphi$$, but in the sine-Gordon equation the right hand side is changed to $$\sin \varphi$$, hence the 'sine'. Zephyr the west wind (talk) 10:25, 1 April 2023 (UTC)