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 20:17, 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.

Feng Luo ignored ルイヴィトン レディース but quickly went to the group that hung League.

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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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'Is it true?' Thousands of rain from the Luo Feng Wang ルイヴィトン 正規店 quickly identify ルイヴィトン コレクション facial expressions.

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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：

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