##### Department of Mathematics,

University of California San Diego

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### Special Colloquium

## Gideon Simpson

#### University of Minnesota

## Numerical Analysis of Parallel Replica Dynamics

##### Abstract:

Parallel replica dynamics was proposed by A.F. Voter as a tool for accelerating molecular dynamics simulations characterized by a sequence of infrequent, but rapid, transitions from one state to another. An example would be the migration of a defect through a crystal. Parallel replica dynamics accelerates this by simulating many replicas simultaneously, concatenating the simulation times of the realizations as though it were a single long trajectory. This motivates important questions: Is parallel replica dynamics algorithm doing what we hope? For what systems will it be useful? How do we implement it efficiently? In this talk, I will thoroughly describe the algorithm and report on progress towards rigorous justification. Open questions and related problems will also be discussed.

Host: Michael Holst

### January 18, 2013

### 9:00 AM

### AP&M 5402

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