SCI 102 Lecture Notes - Lecture 5: Vera Rubin, Cosmological Constant, Vacuum Energy
13 Apr 2016
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> 5 protons per m3 of space: gravity will dominate and re-contract the universe, a closed or oscillating universe. Dark matter etc : ultimate fate of the universe is still undetermined. Galaxy rotation curve: plots star velocities vs/ their distance from the center of the galaxy, vera rubin -> star velocities measured at the edge of a galaxy violate. Invisible material: permeates the galaxy, exerts gravitational influence on the stars. Universe is composed of: 4% baryonic matter = normal matter, 23% dark matter, 73% dark energy (presently causing an acceleration of our universe = another mystery!) Dark energy: totally empty space, the vacuum, contains energy. This energy is variously called dark energy.
