Feynman rules Definition and 97 Threads

  1. Q

    A Feynman rules for Entangled photons

    Should we add to the usual amplitude (sum over all extremal paths of this photon) also the amplitude of the other photon of the pair?
  2. topsquark

    A Derivation of free fields... coefficient question

    Editing... Please be patient! I came across this difficulty comparing several versions of the Feynman rules for QED. I traced the problem back to a statement of Weinberg's in "The Quantum Theory of Fields (Vol 1)", Chapter 5, page 195. Weinberg is busy setting up for deriving free field...
  3. E

    I Schwartz derivation of the Feynman rules for scalar fields

    Hi everyone, In his book "Quantum field theory and the standard model", Schwartz derives the position-space Feynman rules starting from the Schwinger-Dyson formula (section 7.1.1). I have two questions about his derivation. 1) As a first step, he rewrites the correlation function as $$...
    • eoghan
    • Thread
    • Derivation Feynman Feynman rules Fields Qft Rules Scalar Scalar fields
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    • Forum: Quantum Physics
  4. E

    A HQET Feynman Rule: QCD Interaction Vertex Explained

    Several texts state the vertex HQET Feynman rule as : igTijvμ\frac{1}{1+\slashed{v}} with the reasoning for vμ presented as being due to the QCD interaction vertex being between two heavy quark propagators, which are \frac{1+\slashed{v}}{2v.k}, giving ...
  5. M

    Feynman rules and the tree level cross section of two scalar fields

    Hi there. I'm trying to solve the problem mentioned above, the thing is I'm truly lost and I don't know how to start solving this problem. Sorry if I don't have a concrete attempt at a solution. How do I derive the Feynman rules for this Lagrangian? What I think happens is that in momentum...
    • MT777
    • Thread
    • Cross Cross section Feynman Feynman diagrams Feynman rules Fields Quanfum field theory Rules Scalar Scalar fields Scattering cross section Section Tree
    • Replies: 6
    • Forum: Advanced Physics Homework Help
  6. JD_PM

    I Understanding how to derive the Feynman rules out of the path integral

    I am studying interacting scalar fields (from Osborn) using the path integral approach. We define the functional integral \begin{equation*} Z[J] := \int d[\phi] e^{iS[\phi] + i\int d^d x J(x) \phi(x)} \tag{1} \end{equation*} The idea is to differentiate ##Z[J]## with respect to ##J## and end...
    • JD_PM
    • Thread
    • Derive Feynman Feynman rules Integral Path Path integral Rules
    • Replies: 33
    • Forum: Quantum Physics
  7. JD_PM

    Feynman Rules on ##\phi^3, \phi^4## theory

    Let us first take the S-matrix expansion (i.e. Dyson's formula) \begin{align*} S_{fi}&=\langle f | T \left\{ \exp\left( i\frac{\lambda_3}{3!}\int d^4 x :\phi \phi \phi (x) : + i\frac{\lambda_4}{4!}\int d^4 x :\phi \phi \phi \phi (x) : \right) \right\}| i \rangle \\ &= \langle f | i...
  8. M

    I Calculating 2nd Order Scattering Amplitude: Feynman Diagrams

    In the following I will try to deduce the scattering amplitude for a specific interaction. My question is at the bottom, the entire rest is my reasoning to explain how I came to the results I present. My working Let's assume I would like to calculate the second order scattering amplitude in ##...
  9. RicardoMP

    A Trace of a product of Dirac Matrices in a Fermion loop

    I'm working out the quark loop diagram and I've drawn it as follows: where the greek letters are the Lorentz and Dirac indices for the gluon and quark respectively and the other letters are color indices. For this diagram I've written...
    • RicardoMP
    • Thread
    • Dirac Fermion Feynman diagrams Feynman rules Loop Matrices Product Quantum chromodynamics Quantum field theory Trace
    • Replies: 5
    • Forum: Quantum Physics
  10. D

    Calculating Divergent Amplitude in Phi-4 Theory

    For the diagram In scalar field theory, I have obtained an integral which looks like $$\int_{0}^{\Lambda} \frac{d^4 q}{(2\pi)^4} \frac{i}{q^2 - m^2 + i\varepsilon} \frac{i}{(p - q)^2 - m^2 + i\varepsilon}$$ I am required to calculate this and obtain the divergent amplitude $$i\mathcal{M} =...
  11. CharlieCW

    Feynman rules for ##\phi^3## theory

    This is one of the problems I'm currently working on but understanding how to deduce the Feynman rules for this case would give me a better idea on how to do it for more general cases besides ##\phi^4## theory (which is the example commonly covered in books like Peskin and Greiner). 1. Homework...
  12. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 1: Introduction

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 1: Introduction

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  13. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 2: Introduction to Classical Field Theory

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 2: Introduction to Classical Field Theory

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  14. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 3: Quantization of Real Scalar Field - 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 3: Quantization of Real Scalar Field - 1

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  15. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 4: Quantization of Real Scalar Field - 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 4: Quantization of Real Scalar Field - 2

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  16. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 5: Quantization of Real Scalar Field - 3

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 5: Quantization of Real Scalar Field - 3

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  17. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 6: Quantization of Real Scalar Field - 4

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 6: Quantization of Real Scalar Field - 4

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  18. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 7: Quantization of Complex Scalar Field

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 7: Quantization of Complex Scalar Field

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  19. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 8: Interacting Field Theory - 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 8: Interacting Field Theory - 1

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  20. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 9: Interacting Field Theory -2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 9: Interacting Field Theory -2

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  21. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 10: Interacting Field Theory - 3

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 10: Interacting Field Theory - 3

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  22. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 11: Interacting Field Theory - 4

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 11: Interacting Field Theory - 4

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  23. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 12: Interacting Field Theory - V

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 12: Interacting Field Theory - V

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  24. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 13: Interacting Field Theory - VI

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 13: Interacting Field Theory - VI

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  25. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 14: Interacting Field Theory - 7

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 14: Interacting Field Theory - 7

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  26. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 15: Quantization of Electromagnetic Field 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 15: Quantization of Electromagnetic Field 1

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  27. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 16: Quantization of Electromagnetic Field 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 16: Quantization of Electromagnetic Field 2

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  28. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 17: Fermion Quantization 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 17: Fermion Quantization 1

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  29. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 18: Fermion Quantization 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 18: Fermion Quantization 2

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  30. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 19: Fermion Quantization 3

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 19: Fermion Quantization 3

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  31. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 20: Fermion Quantization 4

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 20: Fermion Quantization 4

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  32. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 21: Fermion Quantization 5

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 21: Fermion Quantization 5

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  33. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 22: Fermion Quantization 6

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 22: Fermion Quantization 6

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  34. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 23: The S-Matrix Expansion in QED 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 23: The S-Matrix Expansion in QED 1

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  35. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 24: The S-Matrix Expansion in QED 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 24: The S-Matrix Expansion in QED 2

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  36. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 25: Feynman Rules in QED 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 25: Feynman Rules in QED 1

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  37. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 26: Feynman Rules in QED 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 26: Feynman Rules in QED 2

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  38. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 27: Compton Scattering 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 27: Compton Scattering 1

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  39. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 28: Compton Scattering 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 28: Compton Scattering 2

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  40. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 30: Moller Scattering 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 30: Moller Scattering 1

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  41. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 31: Moller Scattering 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 31: Moller Scattering 2

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  42. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 32: Vertex Correction 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 32: Vertex Correction 1

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  43. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 33: Vertex Correction 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 33: Vertex Correction 2

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  44. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 34: Vertex Correction 3

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 34: Vertex Correction 3

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  45. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 35: Vertex Correction 4

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 35: Vertex Correction 4

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  46. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 36: Electron Self-energy

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 36: Electron Self-energy

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  47. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 37: Photon Self-energy 1

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 37: Photon Self-energy 1

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  48. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 38: Photon Self-energy 2

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 38: Photon Self-energy 2

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  49. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 29: Compton Scattering 3

    Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 29: Compton Scattering 3

    Copyright reserved to Prof. Tripathy and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://nptel.ac.in/courses/115106065/ Syllabus: http://nptel.ac.in/syllabus/syllabus.php?subjectId=115106065
    • Wrichik Basu
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    • Category: Quantum
  50. MathematicalPhysicist

    A Why Do Feynman Rules Successfully Model Particle Interactions?

    I am reading Peskin and Schroeder and finished a few years ago Srednicki. What I don't understand is why do Feynman rules work? They are supposed to represent the diverging integrals that appear in the calculations, i.e momentum integrals, are they supposed to be regarded as a pictorial...