{"paper":{"title":"Ancient shrinking spherical interfaces in the Allen-Cahn flow","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.AP","authors_text":"Konstantinos T. Gkikas, Manuel del Pino","submitted_at":"2017-03-26T09:46:37Z","abstract_excerpt":"We consider the parabolic Allen-Cahn equation in $\\mathbb{R}^n$, $n\\ge 2$, $$u_t= \\Delta u + (1-u^2)u \\quad \\hbox{ in } \\mathbb{R}^n \\times (-\\infty, 0].$$ We construct an ancient radially symmetric solution $u(x,t)$ with any given number $k$ of transition layers between $-1$ and $+1$. At main order they consist of $k$ time-traveling copies of $w$ with spherical interfaces distant $O(\\log |t| )$ one to each other as $t\\to -\\infty$. These interfaces are resemble at main order copies of the {\\em shrinking sphere} ancient solution to mean the flow by mean curvature of surfaces: $|x| = \\sqrt{- 2(n"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.08797","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}