Self-energy: Difference between revisions

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en>Xxanthippe
Reverted good faith edits by 140.181.74.57 (talk): Thanks, bit I think the previous version is better. (TW)
en>Moblecl
Improved introductory style as requested by section tag. Added post-transition comma, corrected mis-implication that quantum field theory is something different than theoretical physics, etc. See more discussion on talk page.
 
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{{Expert-subject|Science|date=November 2008}}
== that is full of horny face ==


'''Brinkmann coordinates''' (named for Hans Brinkmann) are a particular [[coordinate system]] for a [[spacetime]] belonging to the family of [[pp-wave metrics]].  In terms of these coordinates, the [[metric tensor]] can be written as
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:<math>ds^2 \, = H(u,x,y) du^2 + 2 du dv + dx^2 + dy^2</math>
<ul>
 
 
where <math>\partial_{v}</math>, the [[coordinate vector]] field dual to the [[covector]] field <math>dv</math>, is a [[Minkowski space#Causal structure|null vector]] field.  Indeed, geometrically speaking, it is a [[null geodesic congruence]] with vanishing [[optical scalars]]. Physically speaking, it serves as the [[wave vector]] defining the direction of [[wave propagation|propagation]] for the pp-wave.
  <li>[http://lsql.net/plus/feedback.php?aid=38 http://lsql.net/plus/feedback.php?aid=38]</li>
 
 
The coordinate vector field <math>\partial_{u}</math> can be spacelike, null, or timelike at a given [[Spacetime#Basic concepts|event]] in the [[spacetime]], depending upon the sign of <math>H(u,x,y)</math> at that event. The coordinate vector fields <math>\partial_{x}, \partial_{y}</math> are both [[Minkowski space#Causal structure|spacelike vector]] fields. Each surface <math>u=u_{0}, v=v_{0}</math> can be thought of as a [[wavefront]].
  <li>[http://bbs.zgxwhlt.com/home.php?mod=space&uid=79987 http://bbs.zgxwhlt.com/home.php?mod=space&uid=79987]</li>
 
 
In discussions of [[exact solutions]] to the [[Einstein field equation]], many authors fail to specify the intended [[Range (mathematics)|range]] of the [[coordinate]] [[Variable (mathematics)|variables]] <math> u,v,x,y </math>. Here we should take
  <li>[http://bbs.caoduishang.com/home.php?mod=space&uid=46017 http://bbs.caoduishang.com/home.php?mod=space&uid=46017]</li>
 
 
<math>-\infty < v,x,y < \infty, u_{0} < u < u_{1}</math>
</ul>
 
to allow for the possibility that the pp-wave develops a [[null curvature singularity]].
 
==References==
 
*{{cite book | author=Stephani, Hans; Kramer, Dietrich; MacCallum, Malcolm; Hoenselaers, Cornelius & Herlt, Eduard | title=Exact Solutions of Einstein's Field Equations | location=Cambridge | publisher=Cambridge University Press | year=2003 | isbn=0-521-46136-7}}
*{{cite journal | author=H. W. Brinkmann | title=Einstein spaces which are mapped conformally on each other | journal=Math. Ann. | year=1925 | volume=18 | pages = 119 | doi=10.1007/BF01208647}}
 
[[Category:Coordinate charts in general relativity]]
 
 
{{relativity-stub}}

Latest revision as of 19:17, 27 June 2014

that is full of horny face

Northern Alliance that is a huge group of alien inheritors opening shout of laughter, that is full of horny face, Luo Feng has let expressions of disgust.

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'Knife River, I heard you were barking mirror ルイヴィトン キャップ to kill the king, caught in a whirlpool that jiu? there is no such thing?' Chaman king first isolated from the ambient sound, then even whispering.

Luo Feng surprised.

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news has spread fear is, that there is no need to hide it.

'You actually really into jiu whirlpool? 相关的主题文章: