## Free Boundary Problems in PDEs and Particle SystemsIn this volume a theory for models of transport in the presence of a free boundary is developed.Macroscopic laws of transport are described by PDE's. When the system is open, there are several mechanisms to couple the system with the external forces. Here a class of systems where the interaction with the exterior takes place in correspondence of a free boundary is considered. Both continuous and discrete models sharing the same structure are analysed. In Part I a free boundary problem related to the Stefan Problem is worked out in all details. For this model a new notion of relaxed solution is proposed for which global existence and uniqueness is proven. It is also shown that this is the hydrodynamic limit of the empirical mass density of the associated particle system. In Part II several other models are discussed. The expectation is that the results proved for the basic model extend to these other cases.All the models discussed in this volume have an interest in problems arising in several research fields such as heat conduction, queuing theory, propagation of fire, interface dynamics, population dynamics, evolution of biological systems with selection mechanisms.In general researchers interested in the relations between PDE’s and stochastic processes can find in this volume an extension of this correspondence to modern mathematical physics. |

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### Contents

3 | |

6 | |

7 | |

3 The Basic Model Definitions and Results | 11 |

4 Regularity Properties of the Barriers | 21 |

5 Lipschitz and L1 Estimates | 26 |

6 Mass Transport Inequalities | 31 |

7 The Limit Theorems on Barriers | 40 |

10 Proof of the Main Theorem | 61 |

11 The Basic Particle Model and Its Hydrodynamic Limit | 71 |

Part II Variants of the Basic Model | 85 |

12 Introduction to Part II | 87 |

13 Independent Walkers with Current Reservoirs | 89 |

14 Beyond Diffusive Scaling | 97 |

15 Other Models | 101 |

108 | |

### Other editions - View all

Free Boundary Problems in PDEs and Particle Systems Gioia Carinci,Anna De Masi,Cristian Giardina,Errico Presutti No preview available - 2016 |

### Common terms and phrases

2)-particle Author(s basic FBP basic model basic problem boundary conditions bounded function Carinci cell chapter classical solution compact support configuration continuous function converges weakly counting measure CŞu current reservoirs defined definition denote existence Fasano follows Free Boundary Problems free evolution operator Giardinà Green function heat equation hence hydrodynamic limit independent Brownian motions initial datum interval iteration Lemma lower barriers macroscopic Masi mass density mass transport Math Mathematical Physics 12 modulo jö motions with reflections Neumann boundary condition optimal sequence Particle Systems particles move PDEs and Particle Poisson process Presutti Problems in PDEs profiles proof of Theorem prove r)dr relaxed solution rightmost particle scaling limit Sect solves the heat Sºu Sºu(r SpringerBriefs in Mathematical Stefan problem Super-hydrodynamic Theorem 3.2 total mass u e M5 upper barriers