ASTRON 2B03 Lecture Notes - Lecture 32: Subatomic Particle, Massive Compact Halo Object, Dark Energy
28 Aug 2016
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Document Summary
Dark matter: wimps are weakly-interacting massive particles. The evidence suggests that dark matter is wimpy: massive project aimed at looking for low mass stars, black holes, and other machos in the milky way outskirts however, they didn"t find anything. It was used full-time, with two wavelengths of light measured. When a macho passes through the line of sight of a star, then its brightness is magnified. The mass of all neutrinos is not high enough to add up to the amount of dark matter in the universe. If all the dark matter were all in neutrinos, structure in the universe would have formed anti-hierarchically. (galaxy clusters galaxies stars) instead we observe the opposite (stars galaxies galaxy clusters). What do we know about dark matter: it forms 90% of the mass of galaxies, it extends well beyond the visible part of galaxies, it does not interact with light, and is hence not normal matter , non-baryonic.
