Talk:Kerr–Newman metric

message: This article concerns a topic dear to my heart, and I had been monitoring it for bad edits, and had planned to greatly improve it, but I am leaving the WP and am now abandoning this article to its fate.
Just wanted to provide notice that I am only responsible (in part) for the last version I edited;
see User:Hillman/Archive.  I emphatically do not vouch for anything you might see in more recent versions, although I hope for the best.  Unfortunately, general relativity attracts many cranks and the Kerr solution is well known to some of them, so it is likely that at least some future versions of this article will contain slanted information, misinformation, or disinformation.  Beware also of external links to outside websites, which may portray a wide variety of pseudoscience or fringe science topics as more respectable than they really are.
Good luck to all students in your search for information, regardless!---CH 01:26, 1 July 2006 (UTC)
replies: text: Also, note that this article states that the units are geometrized, but doesn't state how. Can we get a statement saying how they are geometrized? McKay 14:45, 20 February 2007 (UTC)
thread_title: Students beware

message: I've been working on this article a bit lately.  The special cases section looks okay, except for some of the stuff that was added here.  In particular, I don't think we really need that info about "orthogonal metric for the oblate spheroidal coordinates in the non-relativistic limit."  The cited source is an article about "maximal analytic extension" which seems like more of a generalization than a special case, and James Hartle has said that the maximal analytic extension “is not very important for physics”.  Certainly, it has not been deemed by Wikipedia editors to be important enough to be covered in articles about other metrics (e.g. Schwarzschild).  So, while I'm not 100% confident about this, I'll go ahead and remove it for now.Ferrylodge (talk) 23:00, 1 January 2009 (UTC)
thread_title: Special cases

message: Hello, Does the mass has an importance in the value of the electromagnetic potential? It doesn't look like, but I don't understand well I am french. What about the synchroton radiation of a rotated body, I know they are weak for a uniform charged body at slow speed, but I don't know at high speed. What about an equivalent phenomenon with gravity, a gravitysynchrotron radiation? Does the acceleration is already in these equation or is there only rotation? thanksKlinfran (talk) 01:08, 14 February 2009 (UTC)
replies: text: No, it appears that the mass does not affect the electromagnetic potential, according to the Kerr-Schild formulation provided here in this Wikipedia article.  Also, the Kerr-Newman solution does not involve any synchotron radiation, since there is only rotation.Ferrylodge (talk) 20:58, 15 February 2009 (UTC)
replies: text:  Well, its an excellent question, though. There may not be any synchrotron radiation in this solution, but how do we know that its physically correct or physically obtainable? How do we know that the correct physical system isn't some null-dust solution with a Kerr-Newman at the center of it? (the null dust being the emitted synchrotron radiation?) That answer to this is hardly obvious. 67.198.37.16 (talk) 05:08, 17 March 2016 (UTC)
thread_title:  synchrotron radiation 

message: Its almost shocking that none of these articles have associated penrose diagrams for them.  67.198.37.16 (talk) 05:08, 17 March 2016 (UTC)
replies: text: I agree!  Someone should do something!   But not me.  :-)  John Baez (talk) 07:39, 4 September 2016 (UTC)
replies: text: Working on it.67.198.37.16 (talk) 06:29, 24 April 2019 (UTC)
thread_title:  Penrose diagrams please 

message: There was a quantity α used to describe the Kerr-Newman metric, which seems to be the same as the quantity "a" used later in the page.  I changed the α's to a's, since most books use a for this quantity, namely J/mc.  John Baez (talk) 07:39, 4 September 2016 (UTC)
thread_title:  alpha becomes a 

message: This is not a typo, the article says "when the rotational parameter a approaches zero" and then r is the same as R. This section is clearly about r. --Yukterez (talk) 21:50, 8 September 2017 (UTC)
thread_title:  r and R

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thread_title:  External links modified 

message: An electron as a naked singularity? Someone decided to pollute the article with obscure nonsense, I am not deleting it because I dont like to get into an edit war on an article which I didnt author, but if this is read by a previous editor of this article, please go ahead and delete it. Kotika98 (talk) 18:00, 29 January 2021 (UTC)
thread_title:  Burinskii?