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SYNTHESIS Particles & Force-Fields 1.What is force? 2.Detecting particles 3.“Empty” space.

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Presentation on theme: "SYNTHESIS Particles & Force-Fields 1.What is force? 2.Detecting particles 3.“Empty” space."— Presentation transcript:

1 SYNTHESIS Particles & Force-Fields 1.What is force? 2.Detecting particles 3.“Empty” space

2 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

7

8 Vacuum Fluctuations

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