Asymptotic behaviour of randomly reflecting billiards in unbounded tubular domains

Autor(es)

Menshikov, M. V. ^[1] ; Vachkovskaia, M. ^[2] ; Wade, A. R. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Durham, Dept Math Sci, Durham DH1 3LE - England

^[2] Univ Estadual Campinas, Inst Math Stat & Sci Computat, Dept Stat, BR-13083970 Campinas, SP - Brazil

^[3] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon - England

• Tipo de documento: Artigo Científico
• Fonte: Journal of Statistical Physics; v. 132, n. 6, p. 1097-1133, SEP 2008.
• Citações Web of Science: 16

Resumo

We study stochastic billiards in infinite planar domains with curvilinear boundaries: that is, piecewise deterministic motion with randomness introduced via random reflections at the domain boundary. Physical motivation for the process originates with ideal gas models in the Knudsen regime, with particles reflecting off microscopically rough surfaces. We classify the process into recurrent and transient cases. We also give almost-sure results on the long-term behaviour of the location of the particle, including a super-diffusive rate of escape in the transient case. A key step in obtaining our results is to relate our process to an instance of a one-dimensional stochastic process with asymptotically zero drift, for which we prove some new almost-sure bounds of independent interest. We obtain some of these bounds via an application of general semimartingale criteria, also of some independent interest. (AU)

• Processo FAPESP: 07/50459-9 - Mikhail Menshikov | University Durham - Inglaterra
• Beneficiário: Serguei Popov
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional