Gradient estimates of the heat kernel for random walks among time-dependent random conductances
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arXiv
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| Format: | Preprint |
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2023
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| author | Deuschel, Jean-Dominique Kumagai, Takashi Slowik, Martin |
| author_facet | Deuschel, Jean-Dominique Kumagai, Takashi Slowik, Martin |
| contents | In this paper we consider a time-continuous random walk in $\mathbb{Z}^d$ in a dynamical random environment with symmetric jump rates to nearest neighbours. We assume that these random conductances are stationary and ergodic and, moreover, that they are bounded from below but unbounded from above with finite first moment. We derive sharp on-diagonal estimates for the annealed first and second discrete space derivative of the heat kernel which then yield local limit theorems for the corresponding kernels. Assuming weak algebraic off-diagonal estimates, we then extend these results to the annealed Green function and its first and second derivative. Our proof which extends the result of Delmotte and Deuschel (2005) to unbounded conductances with first moment only, is an adaptation of the recent entropy method of Benjamini et. al. (2015). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_09675 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Gradient estimates of the heat kernel for random walks among time-dependent random conductances Deuschel, Jean-Dominique Kumagai, Takashi Slowik, Martin Probability 60K37, 60F17, 82C41, 82B43 In this paper we consider a time-continuous random walk in $\mathbb{Z}^d$ in a dynamical random environment with symmetric jump rates to nearest neighbours. We assume that these random conductances are stationary and ergodic and, moreover, that they are bounded from below but unbounded from above with finite first moment. We derive sharp on-diagonal estimates for the annealed first and second discrete space derivative of the heat kernel which then yield local limit theorems for the corresponding kernels. Assuming weak algebraic off-diagonal estimates, we then extend these results to the annealed Green function and its first and second derivative. Our proof which extends the result of Delmotte and Deuschel (2005) to unbounded conductances with first moment only, is an adaptation of the recent entropy method of Benjamini et. al. (2015). |
| title | Gradient estimates of the heat kernel for random walks among time-dependent random conductances |
| topic | Probability 60K37, 60F17, 82C41, 82B43 |
| url | https://arxiv.org/abs/2309.09675 |