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Detecting Hallucination in LLMs: Tracing the Topological Signatures of Impaired Context Sharing

arXiv · AI, language, vision and robotics · article · Sep 17, 2026 · UTC

In this work, we examine the topology of information flow patterns within attention graphs to effectively distinguish hallucinated from non-hallucinated responses. We analyze the Forman-Ricci curvature to identify structural patterns indicating information bottlenecks in attention graphs. We then introduce a method that captures both semi-local and global information-flow characteristics of attention heads associated with hallucinated responses. We evaluate our approach extensively across several LLMs and established benchmarks. Empirical results demonstrate that our proposed single-pass appro

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