Recovering Subtle Cosmological Information with the Zel’dovich-inspired Transform

Abstract

Extracting cosmological information from nonlinear and non-Gaussian large-scale structure (LSS) remains a major challenge. We introduce the Zel’dovich-inspired (ZI) transform, a simple one-parameter local nonlinear transform in which η controls the weighting of higher-order information in the transformed density field. For η ≥ 3, the transform can substantially suppress gravitational non-Gaussianity. Using real-space matter density fields from the Q uijote suite and Fisher analysis, we find that the joint data vector of three transformed-field power spectra with { η = ∞ , 6, 3}, denoted P ZI , reduces marginalized errors for all parameters considered. The improvements range from severalfold for some ΛCDM parameters to factors of 290 for local primordial non-Gaussianity (PNG) and 107 for the summed neutrino mass. Tests on independent fiducial simulations yield nearly unbiased parameter estimates. Compared with other state-of-the-art summary statistics, P ZI provides tighter cosmological constraints.

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BibTeX RIS

BibTeX

@article{王2026recovering,
  title = {{Recovering Subtle Cosmological Information with the Zel’dovich-inspired Transform}},
  author = {Yun 云 Wang 王 and Hao-Ran 浩然 Yu 于 and Yu 瑜 Yu 余 and Ping 平 He 何},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = sep,
  doi = {10.3847/1538-4357/aea08c},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea08c},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Recovering Subtle Cosmological Information with the Zel’dovich-inspired Transform
AU  - Yun 云 Wang 王
AU  - Hao-Ran 浩然 Yu 于
AU  - Yu 瑜 Yu 余
AU  - Ping 平 He 何
PY  - 2026
DA  - 2026/09/30
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea08c
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea08c
AB  - Extracting cosmological information from nonlinear and non-Gaussian large-scale structure (LSS) remains a major challenge. We introduce the Zel’dovich-inspired (ZI) transform, a simple one-parameter local nonlinear transform in which η controls the weighting of higher-order information in the transformed density field. For η ≥ 3, the transform can substantially suppress gravitational non-Gaussianity. Using real-space matter density fields from the Q uijote suite and Fisher analysis, we find that the joint data vector of three transformed-field power spectra with { η = ∞ , 6, 3}, denoted P ZI , reduces marginalized errors for all parameters considered. The improvements range from severalfold for some ΛCDM parameters to factors of 290 for local primordial non-Gaussianity (PNG) and 107 for the summed neutrino mass. Tests on independent fiducial simulations yield nearly unbiased parameter estimates. Compared with other state-of-the-art summary statistics, P ZI provides tighter cosmological constraints.
SN  - 0004-637X
SN  - 1538-4357
ER  -

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