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

__Mittagsseminar Talk Information__ | |

**Date and Time**: Tuesday, March 31, 2009, 12:15 pm

**Duration**: This information is not available in the database

**Location**: OAT S15/S16/S17

**Speaker**: Rajesh Ramaswamy (Mosaic Group)

## A new class of highly efficient exact stochastic simulation algorithm for chemical reaction networks

Stochastic chemical kinetics is modeled by the chemical master equation (CME),
a Markov-chain model that incorporates thermal fluctuations accurately. The
trajectories of the CME are sampled using the stochastic simulation algorithm
(SSA), a kinetic Monte-Carlo scheme proposed by Gillespie. The computational
complexity of the current exact SSA formulations scales with the number of
reactions. Using factored-out reaction propensities, coined the partial-propensity,
we propose a new class of SSA formulations whose computational complexity
scales with the number of species. Since, the number of reactions in a chemical
reaction network grows faster than the number of species when the latter is
increased, our SSA formulation is orders of magnitude faster than the current
exact SSA formulations.

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