Hello everyone! I'm currently a physics student in my sophomore year of undergrad. I just stumbled upon this forum and am curious about the site - very excited to explore and enjoy the ride.
If anyone could give me any tips about using these forums and this site in general, it would be much...
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...
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...
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...
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...
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."...
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...
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...
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...
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...
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...
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?
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...
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...
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...
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!
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
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