Contents

# Contents

## Idea

In perturbative quantum field theory, dimensional regularization is a method for renormalization. Here Feynman amplitudes are expressed via Schwinger parameters in worldline formalism making the resulting expression a function of spacetime dimension $d$ which may formally be set to any real number. Then one regularizes via taking the limit $d \to 4$.

## References

Formulation in the rigorous context of causal perturbation theory/perturbative AQFT is due to