Spherical Collapse Revisited

• nonlinear density contrast evolution
• linearized evolution
• forecasting strutures: critical linearized density

Intermission

• for inspiration/intuition: structure formation movies!
• large scales, dark matter only: Millenium simulation
• a galaxy cluster emergers: Springel simulation
• a Milky Way emerges via mergers; FIRE simulation

Growth of Cosmological Perturbations: Newtonian Linear Theory

• Jeans analysis in non-expanding background
• Perturbation in expanding FLRW background
• Unstable modes, linear growth factor