Anti-symmetric Operator - Application in Quantum Field Theory

Application in Quantum Field Theory

The creation of a particle and anti-particle from a boson is defined similarly but for infinite dimensions. Therefore the Levi-Civita symbol for infinite dimensions is introduced.

\varepsilon_{ijk\ell\dots} = \left\{ \begin{matrix} +1 & \mbox{if }(i,j,k,\ell,\dots) \mbox{ is an even permutation of } (1,2,3,4,\dots) \\ -1 & \mbox{if }(i,j,k,\ell,\dots) \mbox{ is an odd permutation of } (1,2,3,4,\dots) \\ 0 & \mbox{if any two labels are the same} \end{matrix} \right.

The commutation relations are simply carried over to infinite dimensions . is now equal to where n=∞. Its eigenvalue is . Defining the magnetic quantum number, angular momentum projected in the z direction, is more challenging than the simple state of spin. The problem becomes analogous to moment of inertia in classical mechanics and is generalizable to n dimensions. It is this property that allows for the creation and annihilation of bosons.

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