Transience of second-class particles and diffusive bounds for additive functionals in one-dimensional asymmetric and exclusion processes

• Timo Seppäläinen ^[2] ; Sunder Sethuraman ^[1]
  1. [1] Iowa State University

     Iowa State University

     Township of Franklin, Estados Unidos

     
  2. [2] University of Wisconsin
• Localización: Annals of probability: An official journal of the Institute of Mathematical Statistics, ISSN 0091-1798, Vol. 31, Nº. 1, 2003, págs. 148-169
• Idioma: inglés
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• Resumen

  • Consider a one-dimensional exclusion process with finite-range translation-invariant jump rates with nonzero drift. Let the process be stationary with product Bernoulli invariant distribution at density ρ. Place a second-class particle initially at the origin. For the case ρ≠1/2 we show that the time spent by the second-class particle at the origin has finite expectation. This strong transience is then used to prove that variances of additive functionals of local mean-zero functions are diffusive when ρ≠1/2. As a corollary to previous work, we deduce the invariance principle for these functionals. The main arguments are comparisons of H−1 norms, a large deviation estimate for second-class particles and a relation between occupation times of second-class particles, and additive functional variances.