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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 - PowerPoint PPT Presentation
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SYNTHESIS Particles & Force-Fields
1. What is force?2. Detecting particles3. “Empty” space
Force transmitted by exchange of (unobserved) particles
e.g. Electromagnetic force
Two electrons exchange short-lived “virtual” photons
Force
Compton “scattering” of a photon & electron
….. via virtual electron
Bubble chamber photo of electron tracks (photonsdo not show)
Green = electron/positron pair creation
Red = Compton scattering
Modern particle detectors
Positron Emission Tomography (PET scan)blood volume, oxygen usage and glucose metabolism
Vacuum Fluctuations
