BBN: Theory vs Observations

• Predictions: Schramm plot, predictions vs observation likelihoods (BDF, Olive, Yeh, & Young 2020)
• Concordance? Schramm plot (BDF, Molaro, & Sarkar 2019)

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