Peskin Definition and 115 Threads

Aaron Dan Peskin (born June 17, 1964) is an American elected official in San Francisco, California. He serves as a member of the San Francisco Board of Supervisors representing Supervisorial District 3, and is currently Dean of the Board. He was elected in 2015, having previously served two terms in 2001–2009.District 3 includes the neighborhoods of North Beach, Chinatown, Telegraph Hill, North Waterfront, Financial District, Nob Hill, Union Square, Maiden Lane, Polk Gulch and part of Russian Hill.

View More On Wikipedia.org
Recent contents Top users
  1. I

    What are some common questions about Peskin's QFT book?

    Dear all, While I was reading chap2 of Peskin, I got some questions. (1) The vanishment of the commutator of fields [\phi(x),\phi(y)]=0 means that the measurements at x and y do not interfere at all. Is this a postulate? Is this the so-called micro-causality? (2) How Peskin deform the...
  2. 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...
  3. 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.
  4. 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
  5. 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...
  6. S

    QFT Peskin Errata: Pauli Vilars Regularization & Ward Takahashi Identity

    Hi, This is regarding showing, in ch.7, around p.220, that the Pauli Vilars regularization technique is consistent with the ward takahashi identity. I cannot get the following to work: I add eq. 7.31 to eq. 7.32 and do not get zero. I get alpha over 4 pi. (I am left with integral ( 1...
  7. B

    Choosing the Right Quantum Field Theory Book: Peskin or Mandl?

    Hi I'm planning on studying quantum field theory, but I can't choose which book I should buy. I've heard great opinions of both, that's making my decision so hard Peskin's Introduction to Quantum Field Theory https://www.amazon.com/gp/product/0201503972/?tag=pfamazon01-20 or Mandl...
  8. E

    Peskin & Schroeder's proof of Wick's Theorem

    Hi, I am stuck on a step Peskin & Schroeder give in their proof of Wick's Theorem (Intro to Quantum Field Theory, p 90). In the middle of the page when they consider the term with no contraction, it seems like in between the 1st and 2nd lines they somehow factor out the normal ordering...
  9. 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...
  10. 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
  11. 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
  12. P

    Solving Problem 10.3 from Peskin's QFT Book

    Hi, I'm stuck with problem 10.3 from Peskin's QFT book. I'm trying to evaluate the 2-loop sunset diagram in massless phi^4 theory however I keep running into trouble. I'm trying to use standard feynman parameter + dimensional regularisation techniques however i keep getting stuck when it...
  13. 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...
  14. 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...
  15. 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
Back
Top