# Calendar

AQS-automata arise naturally in the description of the athermal dynamics of a disordered system -- such as spin glasses -- when a slowly changing uniform driving force is applied. The response of such systems is characterized by abrupt transitions between quasi-static configurations which are generally irreversible, giving thus rise to hysteresis. The dynamical response of such systems can be described in terms of a pair of random, directed and acyclic graphs, capturing the irreversible transitions triggered by force increases and decreases, respectively. Properties such as return-point memory emerge then as features of these graphs. In this talk I will develop the graph-theoretic description of AQS-automata and then present recent work with T. Witten on modeling the AQS dynamics by random maps.

## Special Institute for Condensed Matter Theory Seminar: AQS-automata, state transition graphs, return-point memory and random maps

Speaker |
(sign-up)
Muhittin Mungan, University of Bonn |
---|---|

Date: | 4/2/2019 |

Time: | 10 a.m. |

Location: | 3110 ESB, 1101 W. Springfield, Urbana |

Sponsor: | Institute for Condensed Matter Theory |

Event Type: | Seminar/Symposium |

AQS-automata arise naturally in the description of the athermal dynamics of a disordered system -- such as spin glasses -- when a slowly changing uniform driving force is applied. The response of such systems is characterized by abrupt transitions between quasi-static configurations which are generally irreversible, giving thus rise to hysteresis. The dynamical response of such systems can be described in terms of a pair of random, directed and acyclic graphs, capturing the irreversible transitions triggered by force increases and decreases, respectively. Properties such as return-point memory emerge then as features of these graphs. In this talk I will develop the graph-theoretic description of AQS-automata and then present recent work with T. Witten on modeling the AQS dynamics by random maps. |

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