Separation of spin and orbital angular coherence momenta in the second-order coherence theory of vector electromagnetic fields

2007 ◽  
Vol 32 (18) ◽  
pp. 2656 ◽  
Author(s):  
Wei Wang ◽  
Mitsuo Takeda
Keyword(s):  
Electromagnetic Fields ◽  
Second Order ◽  
Coherence Theory

On the effective Lagrangian for scalar electrodynamics

1985 ◽  
Vol 63 (3) ◽  
pp. 431-434 ◽  
Author(s):  
Abul Mansur Chowdhury ◽  
Gerry McKeon
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Vector Fields ◽  
Quantum Fluctuations ◽  
External Electromagnetic Field ◽  
Second Order ◽  
Type Approximation ◽  
Effective Lagrangian ◽  
Scalar And Vector Fields ◽  
The One

The one-loop effective Lagrangian in scalar electrodynamics is computed using an expansion to second order in the external electromagnetic field and a WKB-type approximation. Quantum fluctuations of both the scalar and vector fields about background scalar and electromagnetic fields are considered.

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