ASTRON 2B03 Lecture Notes - Counterintuitive, Extra Dimensions, Big Crunch
25 Sep 2013
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Vs. the historic piece of metal sitting in france. Mass piece of metal sitting in france. Strong enough to kee moon in orbit around earth. Keeps galaxies together: balance between gravity of mass and motions of the stars. Gravity acts on short as well as really long ranges. Is it a strong force (relative to other forces?) The big crunch idea -> possible scenario for outcome of the universe (not the favoured model). It is strong - the big crunch has gravity at its base. Gravitational attraction between neighbour and i are small. 1) strong force only imp. on incredibly small scales: keeping protons and neutrons in the nucleus -> keeps corks together, *we are using strong force as our metric. 2) electromagnetic force interaction of light w/ matter -> keeps atoms together: 100x less strong than strong force, infinite range.
