Supernovae and Cosmology

• thumbnail sketch of supernovae
  taxonomy:
  • Type II, Ib/c: obseravation--SN 1987A; theory--core collapse
  • Type Ia: observation--SN 1994D, SN 2014J in M82; SNIa light curve movie
    theory: thermonuclear disruption of white dwarf--simulation
    
• SN Ia digital discovery via subtraction, e.g., here, here
• Supernova cosmology campaigns
  • Supernova Cosmology Project
  • High-z Supernova Search
• Type Ia SNe as Standardizable Candles
  • Examples: low-z SN 1994D, typical medium-z event, z=1.7 discovery in the Hubble Deep Field
  • light curves
  • raw and cooked light curves

Acceleration in a FLRW Universe

• general considerations:
  • pressure large and negative
  • strong energy condition violated
• a Cosmological Constant?
  • a colorful but checkered past: Einstein (1917), Lemaitre (1931)
  • early figures: High-Z, Supernova Cosmology Hubble diagram Matter-Lambda (Knop+ 2003), combined data, figure
  • Riess (2004): Hubble diagram
  • recent data: Dark Energy Survey luminosity distance, Matter-Lambda (Macaulay+ 2019); SNLS team Lambda vs matter (Sullivan et al 2011)
    Pan-STARRS Omega_Lambda vs Omega_matter (Scolnic+ 2018)
    w vs matter (Betoule+ 2014)
• Ignorance parameterized: dark energy
  • limits on dark energy density, evolution
  • analysis including SDSS