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Unformatted text preview: mass states is “ normal ” or “ inverted ” . each mass is a mixture of flavors 56 Next: Is there even further substructure? • Do quarks and leptons have smaller things inside them? • Much current debate on this topic! • Could all the particles be different “ states ” of a more basic entity? "String theory" suggests so. – Universe is actually 11-dimensional (!?) • All but 3 space dimensions are folded up inside “ strings ” … – Particles correspond to different vibrational modes – The Fabric of the Cosmos (now on PBS) by Brian Greene, describes this view • One difficulty: totally inaccessible for experimental tests! – “ Planck Scale ” , 10-35 meters, requires solar-system sized accelerator! • we need new ideas. .....
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- Fall '09
- Physics, Nobel Prize, 300 km, 35 meters, neutrino oscillations, 1 microsecond