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<p>Tidal-torque theory predicts that galaxy angular momenta are imprinted by the primordial tidal field acting on proto-structures and that they can retain information about the early Universe through cosmic evolution. Here we test this prediction by comparing observed galaxy angular momentum vectors with those predicted from the primordial density field reconstructed by ELUCID for the nearby Universe. Among the galaxy populations considered, the gas component of central massive elliptical galaxies provides the clearest signal, exhibiting a strong direction correlation at a significance of about 7<i>σ</i>. These results provide robust observational evidence for tidal-torque theory and open a window for cosmological measurements of neutrino mass and other cosmological parameters.</p>

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A high-significance detection of primordial tidal torque imprints

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Ming-Jie Sheng,
  • Hao-Ran Yu,
  • Min Bao,
  • Bing-Hang Chen,
  • Fang-Na Shao,
  • Qi Guo,
  • Yan-Mei Chen,
  • Huiyuan Wang,
  • Ue-Li Pen,
  • Jie Wang,
  • Xiaohu Yang

摘要

Tidal-torque theory predicts that galaxy angular momenta are imprinted by the primordial tidal field acting on proto-structures and that they can retain information about the early Universe through cosmic evolution. Here we test this prediction by comparing observed galaxy angular momentum vectors with those predicted from the primordial density field reconstructed by ELUCID for the nearby Universe. Among the galaxy populations considered, the gas component of central massive elliptical galaxies provides the clearest signal, exhibiting a strong direction correlation at a significance of about 7σ. These results provide robust observational evidence for tidal-torque theory and open a window for cosmological measurements of neutrino mass and other cosmological parameters.