99 citations · 99 across the 8 of their papers we have counts for
8 papers
How Transformers Reject Wrong Answers: Rotational Dynamics of Factual Constraint Processing
Javier Marín
When a decoder-only transformer is forced to process matched correct and incorrect single-token continuations of a factual query, the two pathways through hidden-state space diverg…
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…
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…
Empirical Characterization of Temporal Constraint Processing in LLMs
Javier Marín
When deploying LLMs in agentic architectures requiring real-time decisions under temporal constraints, we assume they reliably determine whether action windows remain open or have…
Loss Given Default Prediction Under Measurement-Induced Mixture Distributions: An Information-Theoretic Approach
Javier Marín
Loss Given Default (LGD) modeling faces a fundamental data quality constraint: 90% of available training data consists of proxy estimates based on pre-distress balance sheets rathe…
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…
APE: Selective Fine-tuning with Acceptance Criteria for Language Model Adaptation
Javier Marín
We present Adjacent Possible Exploration (APE), a selective fine-tuning method for adapting large language models that systematically explores parameter modifications while maintai…
Localized moving breathers in a 2-D hexagonal lattice
J. L. Marín, J. C. Eilbeck, F. M. Russell
We show for the first time that highly localized in-plane breathers can propagate in specific directions with minimal lateral spreading in a model 2-D hexagonal non-linear lattice.…