Chinese Physics C > 1995, Vol. 19 > Issue(10): 891-897

Cutting Rules and Imaginary Parts of Thermal Green Functions in Thermofield Dynamics

Hou Defu^,,
Li Jiarong

Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 4300702 Wuhan Transportory Science and Technology Technology University, Wuhan 430063

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Abstract：
Under the Thermofield Dynamics, according to the cutting theorem at finite temperature a set of systematic explicit cutting rules to the Feynman diagrams and the relative Feynman rules are proposed, which can be used as an easy approach to calculate the imaginary parts of the thermal Green functions. We applied it to study the imaginary parts of two-point,three-point and four-point Green functions as examples.

References

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Hou Defu and Li Jiarong. Cutting Rules and Imaginary Parts of Thermal Green Functions in Thermofield Dynamics[J]. Chinese Physics C, 1995, 19(10): 891-897.

Hou Defu and Li Jiarong. Cutting Rules and Imaginary Parts of Thermal Green Functions in Thermofield Dynamics[J]. Chinese Physics C, 1995, 19(10): 891-897. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Cutting Rules and Imaginary Parts of Thermal Green Functions in Thermofield Dynamics

Hou Defu^,
Li Jiarong

Corresponding author:Hou Defu,

Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 4300702 Wuhan Transportory Science and Technology Technology University, Wuhan 430063

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1995-10-05

Abstract:Under the Thermofield Dynamics, according to the cutting theorem at finite temperature a set of systematic explicit cutting rules to the Feynman diagrams and the relative Feynman rules are proposed, which can be used as an easy approach to calculate the imaginary parts of the thermal Green functions. We applied it to study the imaginary parts of two-point,three-point and four-point Green functions as examples.