3 1 neutron ddu n 9396 0 electron e 0511

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Unformatted text preview: _______ x –  Universe is ___ ___________ –  Universe is __________ 5/21/13 UW, ASTR 323, SP13, Eric Agol ©2013 5 Hot Big Bang Model •  Resolu8on of Olber’s paradox: Hubble’s law – Universe is expanding – must have been _____ & _____ in the past – a(t)=1/(1+z) •  Another confirma8on: Cosmic Microwave background – blackbody photons emihed when Universe was _______ •  Temperature _______ with 8me: T(t)=T0( )=T0/ . 5/21/13 UW, ASTR 323, SP13, Eric Agol ©2013 6 Par8cle Proper8es Review Par$cle Symbol Rest mass (MeV/c2) Charge Proton (uud) p 938.3 +1 Neutron (ddu) n 939.6 0 Electron e- 0.511 - 1 Neutrino νe, νμ, ντ <2×10- 6 0 Photon ϒ 0 0 Dark maher ? ? 0 Up quark u 2.4 +2/3 Down quark d 5/21/13 4....
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