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May anybody tell the pre-reqs (on calculus) for learn the lagrangian formalism used on quantum field theory ?

Thanks.

- Thread starter live4physics
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- #1

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May anybody tell the pre-reqs (on calculus) for learn the lagrangian formalism used on quantum field theory ?

Thanks.

- #2

malawi_glenn

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well integration and differentiation with several variables, functionals

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However, you mention its use in QFT. If that's your goal, you'll need a lot more physics. In the introduction to his QFT book, Mark Srdnecki gives a set of equations, mostly from QM, that one should be familiar with as prerequisites. See page 8 of

http://www.physics.ucsb.edu/~mark/ms-qft-DRAFT.pdf

Expressed in English, you should be comfortable with:

- Differential scattering cross-section.
- Creation and annihilation operators.
- Angular momentum ladder operators.
- Evolution of operators in the Heisenberg picture.
- Obtaining the Hamiltonian from the Lagrangian.
- Lorentz transformations.
- Relativistic energy-momentum.
- Electromagnetic vector potential.

Topics that are covered in good QM, E&M, and mechanics texts.

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