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Peierls bracket
In theoretical physics, the Peierls bracket is an equivalent description of the Poisson bracket. It directly follows from the action and does not require the canonical coordinates and their canonical momenta to be defined in advance.
The bracket
- [A,B]
is defined as
- DA(B) - DB(A),
as the difference between some kind of action of one quantity on the other, minus the flipped term.
In quantum mechanics, the Peierls bracket becomes a commutator i.e. a Lie bracket.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details