Density and Destiny

0. Theory: Dicke Coincidences
1. Observation: galaxy surveys
   a fair sample of mass/light?
   
   • galaxy halos: rotation curves:
     
     • the pioneer: Vera Rubin (1970)
       
     • geometry of the problem
     • M31: optical, with 21-cm rotation curve from Carignan et al (2006)
     • M33 rotation curve
     • NGC 2997: images optical here ; data hot off the slit spectrograph
     • typical rotation curves examples, by galaxy type
   • galaxy clusters: Virgo, Coma, Fornax, Hercules, Antlia, Abell 1689, Abell 2218, Abell 370, SDSS J1004+4112 , supernova lensed by cluster
   • Testing dark matter: the bullet cluster (Clowe 2006)
     other displaced clusters: MACS J0025.4-1222 here and here (Bradac et al 2008), Abell 520 (Clowe et al 2012), Abell 1758 (Ragozzine et al 2012), DLSCL J0916.2+2951 (Dawson et al 2012)
2. Observation: CMB anisotropies
   Planck 2018 final determination of cosmological parameters

What about gravity?

• equivalence principle, Galileo experiment
  rocket Gedankenexperiment
• strong lensing: 1919 eclipse; galaxies
• gravitational redshift: Pound & Rebka (1960)