What is Qed: Definition and 339 Discussions

QED: Question, Explore, Discover (also called QEDcon or simply QED) is an annual skeptical conference held in Manchester, England. QED is organised by North West Skeptical Events Ltd (NWSE), a volunteer-owned non-profit organisation originating from a collaboration between the Merseyside Skeptics Society and the Greater Manchester Skeptics Society.

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  1. E

    I Computing QED amplitudes in a collider

    Hi there, While reviewing the theory of Feynman diagrams for QED, a question came into my mind. In the textbooks, one usually deals with processes involving two incoming particles. But I could imagine a process where four particles are interacting (e.g. attached picture) and this can give a...
  2. Srihari05

    I Exploring Feynman's Theory on Reflection of Light from Glass Surfaces

    I recently started reading Feynmans book QED. There are a couple of questions I have regarding his theory on the percentage of light that is reflected of two surfaces of glass. My question is as follows, A piece of glass in fact has four surfaces. The front of the glass the back side of...
  3. K

    A Atomic transitions in QED

    In the straight-forward derivation of the Kramer-Heisenberg formula describing the photon-atom scattering cross section (to second order perturbation theory, see e.g. the path leading to https://quantummechanics.ucsd.edu/ph130a/130_notes/node470.html), the finite lifetimes of the intermediate...
  4. P

    I Understanding Electrons: The Difference Between QFT and QED

    What different between QFT and QED? In QFT electron is field quanta, what is electron in QED?
  5. Ken Gallock

    A QED: redshifting light and infrared divergence

    I am looking for some resources describing the following content: A light with wavelength ##\lambda## is propagating in flat spacetime. The light redshifts as its wavelength gets larger and larger. In quantum field theory, this causes an infrared divergence of the field. What I want to know...
  6. sebomba

    QED Lagrangian in terms of left- and right-handed spinors

    Homework Statement I'm stuck at my particle physics exercise about 4-component chiral fields. The following problem is given: "Derive the expression for the QED Lagrangian in terms of the four component right-handed and left-handed Dirac fields ##\Psi_R(x)## and ##\Psi_L(x)##, respectively."...
  7. Hans de Vries

    A New Covariant QED representation of the E.M. field

    90 years have gone by since P.A.M. Dirac published his equation in 1928. Some of its most basic consequences however are only discovered just now. (At least I have never encountered this before). We present the Covariant QED representation of the Electromagnetic field. 1 - Definition of the...
  8. Glenn Rowe

    A Polarization vector sums in QED

    I'm working through Lahiri & Pal's book A First Book of Quantum Field Theory, Second Edition and I'm stuck on their explanation of the polarization vector in quantum electrodynamics in Chapters 8 and 9. In section 8.8, they derive a formula for the sum over the transverse polarization modes of...
  9. S

    I Spin and helicity conservation in QED

    Hi! I am kinda confused about what gets conserved in QED and what not. So the chirality is always conserved, I got that. So in the massless limit, helicity is too. Now in the massive limit. Are spin and helicity conserved? And if they are, are they at each interaction vertex, or just overall...
  10. S

    I QED: Electron Proton Scattering Differential Cross Section

    Hello! We derived the electron proton scattering differential cross section using QED and I noticed that the equation doesn't depend on the impact parameter. Using classical EM one can calculate the deflection of an incoming electron as a function of the impact parameter, so I was wondering how...
  11. S

    I Feynman Rules for Scalar QED: LRZ Reading

    Hello! Can someone direct me towards a reading where the Feynman rules for scalar QED are derived? Thank you!
  12. S

    I QED sum over polarization states

    Hello! In the calculation of the QED matrix element, it says in the book I read that we have to sum over the polarization states of the photon: $$\sum_\lambda \epsilon_\mu^\lambda\epsilon_\nu^{\lambda *}=-g_{\mu\nu}$$ I am a bit confused why do we do a summation over the orthonormal basis...
  13. C

    Quantum Quantum optics/cavity QED refs?

    I just got put on a project involving quantum optics, but have a background in semiconductor transport physics/electronic structure of materials. Does anybody know of a good textbook in this area, covering topics such as, say, the Jaynes-Cummings model?
  14. B

    A Is Chapter 5's Approach to the Photoelectric Effect Unique in QFT Literature?

    Chapter 5 of this book: https://www.amazon.com/dp/0750633719/?tag=pfamazon01-20 as one can see in the table of contents preview, discusses the photoelectric effect starting from the first principles of quantum field theory developed in the earlier chapters. I can't find another qft book which...
  15. A

    Quantum Pair Production QED: Finding a Study Guide

    Homework Statement In a few more months I have to present a report about pair production in quantum electrodynamics, using Feynman diagrams. I have been using the QFT Schwartz book, I find it a bit advanced for my level, could someone recommend me a book to study this phenomenon?. Thank you...
  16. H

    Quantum QED textbook that covers QED cavity and Purcell effect

    Dear all, I am looking for an introductory QED textbook (or quantum optics if not) that also covers QED cavity and Purcell effect in one of its chapters. I am not planning to extensively understand every single detail about QED cavity and Purcell effect since I am not a physicist and I don't...
  17. P

    A The Optical Theorem for Feynman Diagrams

    In Peskin's textbook section 7.3 The Optical Theorem for Feynman Diagrams(Page233), he said it is easy to check that the corresponding t- and u-channel diagrams have no branch cut singularities for s above threshold. But I can't figure out how to prove it. Can angone help me? Thanks!
  18. ShayanJ

    A Conformal symmetry, qed and qcd

    1-As you know classical electrodynamics has conformal symmetry. But does this symmetry survive renormalization? if not, can anyone give an explanation on why? 2-What is the situation with QCD? Does it have conformal symmetry at a classical level? If yes, does it survive renormalization? Thanks
  19. Quantum Field Theory by Dr. Prasanta Tripathy (NPTEL):- Lecture - 1: Introduction

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

    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
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  20. 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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  21. 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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  22. 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

    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
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  23. 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

    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
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  24. 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

    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
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  25. 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

    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
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  26. 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

    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
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  27. 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

    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
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  28. 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

    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
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  29. 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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  30. 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

    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
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  31. 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

    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
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  32. 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

    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
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  33. 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

    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
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  34. 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

    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
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  35. 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

    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
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  36. 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

    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
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  37. 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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  38. 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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  39. 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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  40. 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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  41. 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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  42. 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

    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
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  43. 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

    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
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  44. 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

    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
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  45. 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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  46. 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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  47. 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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  48. 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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  49. 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

    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
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  50. 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

    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
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