Margaret Burbidge 1919-2020: B²FH

BBN: Implications

• baryon density
• dark matter: two kinds!
  • baryonic dark matter: e.g., hot gas in collapsed structures and intergalactic gas; MACHOs (well, probably not MACHOs)
  • non-baryonic dark matter

Particle Dark Matter

Cold Relics: WIMPS

• annihilation requirements
• cold relic dark matter abundance freezeout
• the WIMP miracle

Particle Dark Matter: WIMP Searches

• Accelerators: Large Hadron Collider
• Direct Detection of WIMP scattering
  • XENON
  • SuperCDMS
  • CoGeNT
  • claimed detection(!): DAMA/LIBRA
• Indirect Detection of WIMP annihilations
  • gamma rays: Fermi sky; Galactic Center anomaly
  • cosmic rays: positron anomaly PAMELA detection AMS confirmation

Cosmological Inflation

Motivation: The Standard Cosmology and its Discontents

• successes
• questions/loose ends
  • >horizon problem
  • smoothness problem
  • flatness problem
  • lumpiness problem
  • monopole problem
• compare: Standard Model of Particle Physics
  • great qualitative, quantitative successes
  • but points beyond itself:
    supersymmetry
    grand unification
    quantum gravity/Planck epoch