Occupation times of long-range exclusion and connections to KPZ class exponents

Cédric Bernardin, Patrícia Gonçalves, Sunder Sethuraman

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

With respect to a class of long-range exclusion processes on Zd, with single particle transition rates of order | · | - ( d + α ), starting under Bernoulli invariant measure νρ with density ρ, we consider the fluctuation behavior of occupation times at a vertex and more general additive functionals. Part of our motivation is to investigate the dependence on α, d and ρ with respect to the variance of these functionals and associated scaling limits. In the case the rates are symmetric, among other results, we find the scaling limits exhaust a range of fractional Brownian motions with Hurst parameter H∈ [ 1 / 2 , 3 / 4 ]. However, in the asymmetric case, we study the asymptotics of the variances, which when d= 1 and ρ= 1 / 2 points to a curious dichotomy between long-range strength parameters 0 < α≤ 3 / 2 and α> 3 / 2. In the former case, the order of the occupation time variance is the same as under the process with symmetrized transition rates, which are calculated exactly. In the latter situation, we provide consistent lower and upper bounds and other motivations that this variance order is the same as under the asymmetric short-range model, which is connected to KPZ class scalings of the space-time bulk mass density fluctuations.

Original languageEnglish (US)
Pages (from-to)365-428
Number of pages64
JournalProbability Theory and Related Fields
Volume166
Issue number1-2
DOIs
StatePublished - Oct 1 2016

Keywords

  • Additive functional
  • Exclusion
  • Exponent
  • KPZ class
  • Long-range
  • Occupation time
  • Simple

ASJC Scopus subject areas

  • Analysis
  • Statistics and Probability
  • Statistics, Probability and Uncertainty

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