The Martin boundary of the Directed Landscape
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866910241365426176 |
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| author | Rassoul-Agha, Firas Sweeney, Mikhail |
| author_facet | Rassoul-Agha, Firas Sweeney, Mikhail |
| contents | In the directed landscape, the Martin boundary coincides with the horofunction boundary. We show that functions in this boundary are precisely the eternal solutions possessing a spatial growth rate, and that the minimal Martin boundary is given by the Busemann functions. Moreover, every eternal solution can be expressed as a max-plus convex combination of countably many Busemann functions. Horofunctions are exactly those eternal solutions that admit a representation in terms of at most two Busemann functions with a common growth rate. As a consequence of instability, not all horofunctions are Busemann functions, and the Martin boundary is strictly larger than its minimal part. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_21366 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Martin boundary of the Directed Landscape Rassoul-Agha, Firas Sweeney, Mikhail Probability Dynamical Systems Metric Geometry 60K35, 60K37, 60J50, 31C35, 35F21 In the directed landscape, the Martin boundary coincides with the horofunction boundary. We show that functions in this boundary are precisely the eternal solutions possessing a spatial growth rate, and that the minimal Martin boundary is given by the Busemann functions. Moreover, every eternal solution can be expressed as a max-plus convex combination of countably many Busemann functions. Horofunctions are exactly those eternal solutions that admit a representation in terms of at most two Busemann functions with a common growth rate. As a consequence of instability, not all horofunctions are Busemann functions, and the Martin boundary is strictly larger than its minimal part. |
| title | The Martin boundary of the Directed Landscape |
| topic | Probability Dynamical Systems Metric Geometry 60K35, 60K37, 60J50, 31C35, 35F21 |
| url | https://arxiv.org/abs/2605.21366 |