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Ward identities in nonequilibrium QED

✍ Scribed by Carrington, M. E.; Thoma, Markus H.


Book ID
115517053
Publisher
The American Physical Society
Year
1998
Tongue
English
Weight
206 KB
Volume
58
Category
Article
ISSN
1550-7998

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We present a field-theoretical method to obtain consistently the equations of motion for small amplitude condensate perturbations in a homogeneous Bose-condensed gas directly in real time. It is based on a linear response and combines the Schwinger-Keldysh formulation of nonequilibrium quantum field