Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2602.16869v1</id>\n    <title>Testing the cosmic distance-duality relation with localized fast radio bursts: a cosmological model-independent study</title>\n    <updated>2026-02-18T20:53:19Z</updated>\n    <link href='https://arxiv.org/abs/2602.16869v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2602.16869v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>We test the Etherington cosmic distance-duality relation (CDDR), by comparing Type Ia supernova (SNIa) luminosity-distance information from the Pantheon+ compilation with an angular-diameter-distance reconstructed from localized Fast Radio Bursts (FRBs). The core of our methodology is a data-driven reconstruction from FRBs using artificial neural networks (ANNs): we infer a smooth mean extragalactic dispersion-measure relation and use its redshift derivative to recover $H(z)$ and hence $D_\\mathrm{A}^{\\rm FRB}(z)$ without assuming a parametric form for the expansion history. Possible deviations from CDDR are parameterized through three one-parameter models of $η(z)\\equiv D_\\mathrm{L}/[(1+z)^2D_\\mathrm{A}]$. We implement two complementary likelihoods: (i) a direct approach using individual SNIa with the full Pantheon+ covariance, and (ii) a machine-learning approach in which we reconstruct the SN Hubble diagram on the FRB redshift grid, propagating SN and FRB uncertainties into non-diagonal covariance matrices via Monte Carlo and bootstrap realizations. Within the FRB reconstruction, we anchor the mean extragalactic dispersion measure at $z=0$, which yields a data-driven constraint on the average host/near-source contribution $\\mathrm{DM}_{\\rm host}=128.8\\pm 34.1\\,\\mathrm{pc\\,cm^{-3}}$ ($3σ$ of statistical confidence). We find that both likelihood implementations give consistent posteriors and no statistically significant evidence for departures from CDDR at the current precision.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.CO'/>\n    <category scheme='http://arxiv.org/schemas/atom' term='hep-ph'/>\n    <published>2026-02-18T20:53:19Z</published>\n    <arxiv:primary_category term='astro-ph.CO'/>\n    <author>\n      <name>Jéferson A. S. Fortunato</name>\n    </author>\n    <author>\n      <name>Surajit Kalita</name>\n    </author>\n    <author>\n      <name>Amanda Weltman</name>\n    </author>\n  </entry>"
}