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# Lecture 12

## Review of Boltzman equation based galaxy collisions

### Plummer model used as an example

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### (1) Plummer model at rest and Monte Carlo (built on Assignment 3)

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### (2) Role of smeared gravitational potential in collisionless realization (like in Arseth code)

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### (3) Embedding small Plummer sphere inside large Plummer sphere (mimicking the bulge inside the disk)

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### (4) Plummer model in uniform motion

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### (5) Plummer model in external gravitational field (CBE Monte Carlo)

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### (6) Two Plummer spheres colliding on elliptic orbits (CBE Monte Carlo)