Quantum Field Theory pp 45-65 | Cite as

# Disturbing the Vacuum

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## Abstract

We started our discussion in Sect. 1.1 with the amplitude for the process \(\mathcal{A}=\mathcal{D}(x_2)\mathcal{G}(x_2;x_1)\mathcal{C}(x_1) \) involving creation, propagation and detection (usually accompanied by destruction) of a particle and concentrated on the middle part \(\mathcal{G}(x_2;x_1)\).

## Keywords

Harmonic Oscillator Momentum Space Functional Derivative Divergent Term Weak Source
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© Springer International Publishing Switzerland 2016