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Path integral formulation (Due to Feynman) is a major formulation of Quantum Mechanics along with Matrix mechanics (Due to Heisenberg and Pauli), Wave Mechanics (Due to Schrodinger), and Variational Mechanics (Due to Dirac). DO NOT USE THIS TAG for line/contour integrals.

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The path integral representation of the transition amplitude between the vacua of two field ...

The background of the question: PhysRevLett.115.261602. $ \newcommand\ket[1]{| #1 \rangle} \newcommand\braket[1]{\left\langle{#1}\right\rangle} \newcommand\dif{\mathrm{d}} \newcommand\E{\mathrm{e}} …
Hoyan Mok's user avatar
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The path integral representation of the transition amplitude between the vacua of two field ...

After some discussion with a friend we came out the following explanations.$ \newcommand\ket[1]{| #1 \rangle} \newcommand\bra[1]{\langle #1 |} \newcommand\braket[1]{\left\langle{#1}\right\rangle} \ne …
Hoyan Mok's user avatar
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