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The Worldline Quantum Field Theory (WQFT) has proven to be an efficient toolfor calculating observables in gravitational wave physics. In contrast to otherQFT-based techniques in the realm of gravitational wave physics, it makes theclassical limit very apparent. However, a natural question remains: How does itrelate to ordinary quantum field theories that we know from particle physics?This question will be addressed by extending existing approaches to adescription including spin. Furthermore, it will be explicitly shown that theWQFT can retain quantum contributions by summing up infinite towers ofworldline loops.

Relations between the Worldline Quantum Field Theory and scattering amplitudes for particles with spin