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cs.AI2026
A Geometric Taxonomy of Hallucinations in LLMs
Javier Marín
Hallucinations in deployed language models can have real consequences for downstream decisions in domains such as healthcare, legal, and financial services. In production, detectio…
cs.AI2025
Semantic Grounding Index: Geometric Bounds on Context Engagement in RAG Systems
Javier Marín
When retrieval-augmented generation (RAG) systems hallucinate, what geometric trace does this leave in embedding space? We introduce the Semantic Grounding Index (SGI), defined as…
cs.AI2025
Capability Ceilings in Autoregressive Language Models: Empirical Evidence from Knowledge-Intensive Tasks
Javier Marín
We document empirical capability ceilings in decoder-only autoregressive language models across knowledge-intensive tasks. Systematic evaluation of OPT and Pythia model families (7…