How to be causal: time, spacetime and spectra

  title={How to be causal: time, spacetime and spectra},
  author={Paul Kinsler},
  journal={European Journal of Physics},
  • Paul Kinsler
  • Published 2011
  • Physics
  • European Journal of Physics
  • I explain a simple definition of causality in widespread use, and indicate how it links to the Kramers–Kronig relations. The specification of causality in terms of temporal differential equations then shows us the way to write down dynamical models so that their causal nature in the sense used here should be obvious to all. To extend existing treatments of causality that work only in the frequency domain, I derive a reformulation of the long-standing Kramers–Kronig relations applicable not only… CONTINUE READING

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