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SYNTHESIS Particles & Force-Fields

SYNTHESIS Particles & Force-Fields. What is force? Detecting particles “Empty” space. Force. Force transmitted by exchange of (unobserved) particl es. e.g. Electromagnetic force Two electrons exchange short-lived “virtual” photons. Compton “scattering” of a photon & electron

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SYNTHESIS Particles & Force-Fields

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  1. SYNTHESIS Particles & Force-Fields • What is force? • Detecting particles • “Empty” space

  2. Force Force transmitted by exchange of (unobserved) particles e.g. Electromagnetic force Two electrons exchange short-lived “virtual” photons

  3. Compton “scattering” of a photon & electron ….. via virtual electron Bubble chamber photo of electron tracks (photons do not show) Green = electron/positron pair creation Red = Compton scattering

  4. Modern particle detectors

  5. Positron Emission Tomography (PET scan) blood volume, oxygen usage and glucose metabolism

  6. Vacuum Fluctuations

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