@article{directionalcurvaturefromarmijobacktracki,
  title = {Directional Curvature from Armijo Backtracking: A Low-Cost Sharpness Probe and a Calibration-Free Learning-Rate Safeguard for Adam},
  author = {Ashmitha R and Jörg Frochte},
  year = {2026},
  eprint = {2607.03998},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.03998},
}