Schroeder Definition and 71 Threads

Schroeder is a North German (from Schröder) occupational name for a cloth cutter or tailor, from an agent derivative of Middle Low German schroden, schraden "to cut". The same term was occasionally used to denote a gristmiller as well as a shoemaker, whose work included cutting leather, and also a drayman, one who delivered beer and wine in bulk to customers; in some instances the surname may have been acquired in either of these senses. This name is widespread throughout central and eastern Europe which has been held by many notable people, including:

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  1. C

    Peskin and Schroeder, equation 2.51

    Hi I am struggling to justify D(x-y) \approx e^{-i m t} as t \rightarrow \infty from \int dE \sqrt{E^2-m^2} e^{-i E t} . I thought I might get some insight from discretizing, as e^{-i m t} \sum_{n=0}^{\infty} \epsilon \sqrt{ n \epsilon ( 2 m + n \epsilon ) } e^{-i...
  2. J

    PF is a resource for questions about Peskin & Schroeder

    Here is a list of questions that have been posted in the past concerning Peskin & Schroeder, An Introduction to Quantum Field Theory. If you have a question about the book, you can look here first to see if it has already been answered. One caveat, sometimes the page numbering that I used can be...
  3. N

    Peskin Schroeder which chapter

    Hi, May you please asdvise me where in Peskin Schroeder it is described how to derive 1/r potential for electrodynamics... (I mean from quantum field point of view) Thanks
  4. T

    Conserved charge as a generator of symmetry, Peskin & Schroeder

    Hey! I am stuck at a passage in the QFT book of Peskin & Schroeder and I need your help :) It is about page 698, last break. The sentence is: "At long wavelength, the Goldstone bosons become infinitesimal symmetry rotations of the vacuum, Q |0> , where Q is the global charge associated...
  5. N

    Schroeder on thermodynamical reversibility, entropy and quasi-static equilibrium

    Hello, In "An Introduction to Thermal Physics" Schroeder goes to deduce that for any quasi-static process: W = -PdV (p.21), and then on page 112, with the help of dE = Q + W (= first law of Td.) and dE = TdS - PdV (= the Td. identity), he deduces that Q = TdS for ALL quasi-static processes...
  6. P

    Peskin Schroeder Problem 5.6 (b) Weyl spinors

    Hey! I have a problem with problem 5.6 (b) from Peskin + Schroeder. Maybe I just don't see how it works, but I hope somebody can help me! Homework Statement We are asked to calculate the amplitude for the annihilation of a positron electron pair into two photons in the high-energy limit. The...
  7. P

    Peskin & Schroeder QFT 5.6 Need help

    Hey! I need some help for problem 5.6 (b) in Peskin + Schroeder QFT. I can't get rid of the term including three gamma matrices in my amplitude. I get two terms of the form: \frac{-\gamma^{\nu}*\slash{k_2}*\gamma^{\mu} + 2\gamma^{\nu}p_1^{\mu}}{-2*p_1*k_2} and the same with k_1 <->...
  8. S

    How Do Peskin and Schroeder Derive the Integral in Equation (2.52)?

    Hi there. I've just finished reading chapter 2 of Peskin and Schroeder, and I managed to follow all of their calculations - with one exception: Homework Statement I'm not sure how P&S arrive at the integral in equation (2.52) (page 27) from the previous step in the calculation of D(x-y)...
  9. maverick280857

    More correlation functions (Chapter 4, Peskin and Schroeder)

    Hi everyone I am trying to get equation 4.29 of Peskin and Schroeder from equation 4.28. This is what I did |\Omega\rangle = \lim_{T\rightarrow\infty(1-i\epsilon)}\left(e^{-iE_{0}(t_{0}-(-T))}\langle\Omega|0\rangle\right)U(t_0, -T)|0\rangle Take the Hermitian Adjoint of both sides. \langle...
  10. maverick280857

    Problem with Path Integral Expressions in Peskin And Schroeder Section 9.1

    Hi again everyone, I have some doubts about the path integral expressions given in Section 9.1 of Peskin and Schroeder (pg 281 and 282). For a Weyl ordered Hamiltonian H, the propagator has the form given by equation 9.11, which reads U(q_{0},q_{N};T) = \left(\prod_{i,k}\int dq_{k}^{i}\int...
  11. nicksauce

    Peskin and Schroeder p. 20-21

    In equation 2.23 we have \phi = \frac{1}{\sqrt{2\omega}}(a + a^{\dagger}) So how come equation 2.25 is \phi(x) = \int{\frac{d^3p}{(2\pi)^3}\frac{1}{\sqrt{2\omega_p}}(a_pe^{ipx} + a_p^{\dagger}e^{-ipx})} And not \phi(x) = \int{\frac{d^3p}{(2\pi)^3}\frac{1}{\sqrt{2\omega_p}}(a_p +...
  12. I

    Learning Feynman Diagrams from Peskin & Schroeder

    Homework Statement I’m trying to learn Feynman diagrams from Peskin and Schroeder. I’m stuck right now on page 91-93, especially about constant factors and symmetry factors. Equation 4.44 and the two constants 3 and 12 in it make perfect sense to me. The trouble starts with 4.45. I understand...
  13. S

    Peskin Schroeder: How to Derive Sin^2 Using Compton Relation?

    Dear PF, I have one question form Peskin Schroeder...could you pls help me It is very simple question... Since I don't know how to write formulas here I put my question in attachment. Thank you very much.
  14. S

    Question form Peskin Schroeder

    Sorry for bothering... How does righthand side of formula 5.94 is derived from its left handside after some approximation? Probably it is very simple question but I could't get that expression:confused: Thank u very much
  15. S

    Learning QFT from Peskin and Schroeder

    I'm still pretty new to QFT, so forgive me if I have made a ridiculous mistake. I've been learning QFT from Peskin and Schroeder mostly but decided to read Ryder recently and I have just come across an amazing result (in my opinion) in Chapter 3. Ryder basically shows that the electromagnetic...
  16. N

    How Does Causality Emerge in Quantum Field Theory Expressions?

    Gentlemen, Could you help me please, I am sure it is not even worthy of your attention, but anyway... In Peskin, Schroeder - from expresion <0|\phi(x)\phi(y)|0> survives <0|a_p a_q^\dag|0> so it creates one-particle state |q> at position y and another one-particle state | p> at postion...
  17. R

    What Do the Commutators in Peskin and Schroeder's Equation (2.30) Represent?

    Can someone tell me what the two commutators in (2.30) stand for? It has to be Dirac delta functions, but which one exactly? thank you
  18. R

    Peskin & Schroeder: Opening p.20 to Understand Equation 2.21

    would someone mind opening his/her beloved P&S and help me out.. on p.20 it says if we expand the classical Klein-Gordon field in Fourier (momentum) space, we arrive at equation 2.21...why is that? gracias
  19. F

    Questions on An Introduction to Quantum Field Theory by Peskin and Schroeder

    Greetings--I have a few questions from An Introduction to Quantum Field Theory by Peskin and Schroeder. Note: I'm not sure how to construct the contraction symbol using \LaTeX, so instead I will use the following cumbersome convention: \overbrace{\psi(x)\overline{\psi(y)}}=S_F(x-y), they...
  20. Norman

    QFT proof from Peskin and Schroeder

    I am unsure if this is the proper forum for this, since it is not actually homework... but here goes anyway. I am trying to Prove Peskin and Schroeder equation 2.33( the second equal sign) P=-\int d^3 x \pi (x) \nabla \phi (x) = \int \frac{d^3 x}{(2 \pi)^3} p a^{\dagger}_p a_p so...
  21. Norman

    Peskin & Schroeder: Is it a Good First Time QFT Book?

    Hello all, Just wondering if Peskin and Schroeder is a good first time QFT book? If so, what would be a good book to supplement it with? Cheers, Norm
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