{
  "annotation_id": "e6c2250f-db3f-401b-960f-0d46a6958b28",
  "date_created": "2026-02-17T05:53:04.895000Z",
  "date_modified": "2026-02-17T05:53:04.895000Z",
  "file_hash": "11a9a1cc80ba41ad53eaee8f1e834dc90e6d8de32e2db2b76cb51dbcefc85f39",
  "private": false,
  "record": {
    "abstract": "Near-cloaks based on passive coatings can strongly suppress scattered-field energy in a narrow frequency band, yet an observer\u0027s ability to infer object parameters from noisy measurements need not decrease proportionally. We develop a fully theoretical two-dimensional (2D) framework for a coated acoustic cylinder in an air background. Using an exact cylindrical-harmonic solution of the Helmholtz equation, we compute the modal scattering coefficients a_m(omega) for a core of radius a surrounded by two concentric effective-fluid layers, and we design the coating to cancel the dominant low-order multipoles (monopole m=0 and dipole m=+/-1) at a target frequency, yielding a narrowband near-cloak. Beyond the conventional energetic metric (total scattering width), we quantify information-based detectability through the Fisher information matrix (FIM) and the associated Cramer-Rao lower bounds (CRLBs) for joint estimation of the size-material parameter vector x=[a, rho1, c1]^T from noisy far-field data. A representative air-background study exhibits an approximately 25 dB reduction in total scattering width near the design frequency, while tr(FIM) decreases by only a few dB, demonstrating that energy-based and inference-based notions of invisibility are distinct objectives. We further provide a low-order analytic argument clarifying the mechanism behind this energetic-informational decoupling and report design-space and local-robustness diagnostics that highlight persistent trade-offs between scattering suppression and parameter identifiability.",
    "arxiv_id": "2601.06091",
    "authors": [
      "J. Sumaya-Martinez",
      "J. Mulia-Rodriguez"
    ],
    "categories": [
      "physics.optics",
      "cond-mat.soft",
      "physics.flu-dyn"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Energetic vs Inference-Based Invisibility: Fisher-Information Analysis of Two-Layer Acoustic Near-Cloaks",
    "url": "https://arxiv.org/abs/2601.06091",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cf693dee-1c47-47d2-9532-9af5a5d2e860",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}