Symmetry factors of Feynman diagrams for scalar fields |
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Authors: | P V Dong L T Hue H T Hung H N Long N H Thao |
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Institution: | 1.Institute of Physics,Vietnamese Academy of Science and Technology, Bo Ho,Hanoi,Vietnam |
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Abstract: | We calculate the symmetry factors of diagrams for real and complex scalar fields in general form using an analysis of the
Wick expansion for Green’s functions. We separate two classes of symmetry factors: factors corresponding to connected diagrams
and factors corresponding to vacuum diagrams. The symmetry factors of vacuum diagrams play an important role in constructing
the effective action and phase transitions in cosmology. In the complex scalar field theory, diagrams with different topologies
can contribute the same, and the inverse symmetry factor for the total contribution is therefore the sum of the inverse symmetry
factors. |
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Keywords: | |
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