Nonlinear Reality

• spherical collpase model
• forecasting structures from initial density field

The Nonlinear Universe: Press-Schechter Theory

• ingredients/worldview
  smoothing of density field
• derivation I: quick-n-dirty
• derivation II: excursion set
• results (with animated evolution) and their limitations
• tests of PS
• applications of PS:
  clusters, mergers, quasar abundances