en>Addbot: Bot: Migrating 3 interwiki links, now provided by Wikidata on d:q1106636

2013-03-02T10:02:03Z

Bot: Migrating 3 interwiki links, now provided by Wikidata on d:q1106636

← Older revision		Revision as of 12:02, 2 March 2013
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	~~Hello. Let me introduce the writer. Her title~~ is ~~Refugia Shryock. Years~~ in the ~~past we moved~~ to ~~North Dakota and I adore each day living here~~. ~~He used to be unemployed~~ but ~~now he is~~ a ~~computer operator but his marketing never comes. Playing baseball~~ is the ~~hobby he will by no means quit performing.~~<br><br>~~My blog post~~: ~~[http~~://~~www.shipzula.com~~/~~blogs~~/~~post/16377 home std test kit~~]		{{Unreferenced stub\|auto=yes\|date=December 2009}}
			In physics, a '''global symmetry''' is a [[symmetry in physics#Local and global symmetries\|symmetry]] that holds at all points in the [[spacetime]] under consideration, as opposed to a [[local symmetry]] which varies from point to point.

			Global symmetries require [[conservation law]]s, but not [[forces]], in physics.

			An example of a global symmetry is the action of the <math>U(1)=e^{iq\theta}</math> (for <math>\theta</math> a constant - making it a global transformation) group on the Dirac Lagrangian:

			::<math>\mathcal{L}_D = \bar{\psi}\left(i\gamma^\mu \partial_\mu-m\right)\psi</math>

			Under this transformation the wavefunction changes as <math>\psi\rightarrow e^{iq\theta}\psi</math> and <math>\bar{\psi}\rightarrow e^{-iq\theta}\bar{\psi}</math> and so clearly:

			::<math>\mathcal{L}\rightarrow\bar{\mathcal{L}}=e^{-iq\theta}\bar{\psi}\left(i\gamma^\mu \partial_\mu-m\right)e^{iq\theta}\psi=e^{-iq\theta}e^{iq\theta}\bar{\psi}\left(i\gamma^\mu \partial_\mu-m\right)\psi=\mathcal{L}</math>

			==See also==
			*[[Field (physics)]]
			*[[Global spacetime structure]]
			*[[Local spacetime structure]]

			{{DEFAULTSORT:Global Symmetry}}
			[[Category:Quantum field theory]]
			[[Category:Symmetry]]

			{{Physics-stub}}

en>Justincheng12345-bot: r2.7.3) (Robot: Adding zh:多参考组态相互作用方法

2012-06-23T15:33:33Z

r2.7.3) (Robot: Adding zh:多参考组态相互作用方法

New page

Hello. Let me introduce the writer. Her title is Refugia Shryock. Years in the past we moved to North Dakota and I adore each day living here. He used to be unemployed but now he is a computer operator but his marketing never comes. Playing baseball is the hobby he will by no means quit performing.<br><br>My blog post: [http://www.shipzula.com/blogs/post/16377 home std test kit]

Multireference configuration interaction - Revision history

en>Addbot: Bot: Migrating 3 interwiki links, now provided by Wikidata on d:q1106636

en>Justincheng12345-bot: r2.7.3) (Robot: Adding zh:多参考组态相互作用方法