@article{matrixdecoupledconcentrationforautoregre,
  title = {Matrix-Decoupled Concentration for Autoregressive Sequences: Dimension-Free Guarantees for Sparse Long-Context Rewards},
  author = {Pei-Sen Li},
  year = {2026},
  eprint = {2605.06017},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.06017},
}