Local limit theorem for directed polymers beyond the $L^{2}$-phase
We consider the directed polymer model in the weak disorder phase under the assumption that the partition function is L^{p} -bounded for some p>1+{2}/d . We prove that the point-to-point partition function can be approximated by two point-to-plane partition functions at the startpoint and endpoint, and in particular that it is L^{p} -bounded as well. Some consequences of this result are also discussed, the most important of which is a local limit theorem for the polymer measure. We furthermore show that the required L^{p} -boundedness holds for some range of \beta beyond the L^{2} -critical point, and in the whole interior of the weak disorder phase for environments with finite support.
Authors
- Stefan Junk (ORCID: https://orcid.org/0000-0002-5151-8008)
Institutions
- Gakushuin University (JP)
Publication Details
- Journal
- Journal of the European Mathematical Society
- Published
- 2025-05-20
- DOI
- https://doi.org/10.4171/jems/1650
- Primary Topic
- Mathematical Dynamics and Fractals
- Type
- article
- Field-Weighted Citation Impact
- 0.00