Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with A. Steger, D. Steurer and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Thursday, March 07, 2013, 12:15 pm

Duration: 30 minutes

Location: OAT S15/S16/S17

Speaker: Ueli Peter

Fast Simulation of the IDLA Process

The internal diffusion limited aggregation (IDLA) process places n particles one after another on the two dimensional integer grid Z2. Every particle starts a random walk at (0,0) and remains at the first unoccupied grid position that it hits. The expected running time of a straightforward step-by-step simulation is \Theta(n2). Recently, Friedrich and Levine described an algorithm that samples from all possible outcomes of the IDLA process with the correct distribution and has an expected running time of O(n3/2). We improve on their result by presenting an algorithm that has an expected running time of O(n\log2 n). This is joint work with Karl Bringmann, Fabian Kuhn, Konstantinos Panagiotou and Henning Thomas.

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