Ultimate Free Lunch - Ultimate Free Lunch Four fundamental...

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Ultimate Free Lunch Four fundamental forces in nature o gravity – extremely weak, but acts on all matter o electromagnetism (E.M.) – acts only on charged particles holds us together o strong nuclear – 100x stronger than EM but acts only at extremely short range just outside the nucleus o Weak nuclear force – very short range decay is an example of o weak nuclear force and EM are unified – come from the same common force When particles smash into each other can’t tell the difference between weak nuclear and EM Grand Unified Theories (GUTs) o attempt to unifty the electroweak and strong nuclear forces o predict that protons will decay – current estimates – about 10^32 years o excess of matter over antimatter is ok Theory of Everything o Unify GUT force and gravity o superstring theory o 10 or 11 dimensions necessary for it to work Forces of nature were once unified o right after Big Bang the temperature was exceedingly high o photons would smash together, forming particle-antiparticle pairs, which
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This note was uploaded on 04/04/2008 for the course ASTRO C 10 taught by Professor Filippenko during the Fall '08 term at University of California, Berkeley.

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Ultimate Free Lunch - Ultimate Free Lunch Four fundamental...

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