What is the Operator Product Expansion in Interacting Field Theory?

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The discussion centers on the Operator Product Expansion (OPE) in interacting field theory, with a user seeking a comprehensive explanation. They have read about renormalization and Weinberg but still struggle to grasp OPE, particularly for the λφ^4 theory. Another participant suggests consulting the "big yellow book" by Francesco, which focuses on conformal field theory. However, the user clarifies that their interest lies in non-conformal theories and expresses difficulty in writing down the OPE for λφ^4. The conversation highlights a gap in resources for understanding OPE in non-conformal contexts.
gullio
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hello,
I'm trying to find a good and exaustive explanation of operator product expansion.
I've read "renormalization" and weinberg but i continue to not understand ope in interacting field theory.
someone could help me?
 
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Do you have a specific question? Also, have you read the big yellow book (Francesco)?
 
Yes but explain only conformal field theory.
For example I'm not able to wright down the ope for \lamda \phi^4. I don't know how to start
 
Sorry, I don't know anything about OPEs for non-conformal theories.
 

Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?
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