Recent content by aams

  1. A

    QFT (derivative the covariant and contravariant fields)

    yess! I'm understand. I am grateful to you thanx Fredrik!
  2. A

    QFT (derivative the covariant and contravariant fields)

    sorry, I mean you explain where (x sub i) what about upper indices? what is the difference?! http://www.gulfup.com/?dSTVRF ??!
  3. A

    QFT (derivative the covariant and contravariant fields)

    thank you very much .. I'm understand ,but the last question, is not to need conversion between contra and covariant ..? How does contra and covariant affect the differentiation?
  4. A

    QFT (derivative the covariant and contravariant fields)

    aah, thanks Fredrik. please just tell me the steps for method to choose the dummy variables. why must be using it? what is the idea of choose it? and how can me use the dummy variables?!
  5. A

    QFT (derivative the covariant and contravariant fields)

    please see here: https://www.physicsforums.com/showthread.php?t=317170 how to calculate the the 2nd term of the euler lagrangian density eq. :(
  6. A

    QFT (derivative the covariant and contravariant fields)

    thanks vanhees71 I know that, but i ask can me consider these vectors as two multiplied functions (quadratic ∂ ø) and derivative becomes 2 ∂αø?
  7. A

    QFT (derivative the covariant and contravariant fields)

    Hi, please help me .. How can I derivative covariant and contravariant fields? as in the attached picture Thanks.. http://www.gulfup.com/?tNXcaN w.r.t alpha
See more
Back
Top