Physics in a FLRW Universe

• redshifts
• time dilation observed in extragalactic Type Ia supernovae!
  
  • light curve width (Leibundgut+ 1996)
  • evolution of spectral features (Foley+ 2005; Blondin+ 2008)
• distance measures
  • luminosity distance
  • angular diameter distance
    implications: CMB flucutations yield cosmic parameters
  • particle horizon
• causality in a FLRW universe