Wavelet-scattering Signatures of Fuzzy Dark Matter in Simulated 21 cm Brightness–Temperature Maps
4 affiliations
- 1Yunnan University
- 2Nagoya University
- 3School of Physical Science and Technology
- 4Beijing Normal University
Abstract
We study the effect of fuzzy dark matter (FDM) on the multiscale morphology of simulated redshifted 21 cm maps during Cosmic Dawn and the Epoch of Reionization. Using FDM-modified 21cmFAST light cones, we apply the two-dimensional wavelet scattering transform (WST) to matched 2 MHz map products. The first-order coefficients S ₁ ( j ) summarize wavelet-band amplitudes, while the normalized second-order ratio R = S ₂ / S ₁ ( j ₁ ) measures ordered cross-scale modulation. FDM shifts and reshapes both summaries through delayed halo and source formation. We compare a two-dimensional power spectrum (PS), WST, and their combination on the same transferred and noisy maps. In this controlled local Fisher analysis, PS+WST reduces the marginalized errors on the FDM mass, effective X-ray emissivity normalization, and ionizing efficiency by approximately a factor of 1.8 relative to the matched two-dimensional PS baseline, although the dominant mass-heating degeneracy remains. An idealized three-wedge test shows that R is less reshaped at the coefficient level than S ₁ . The covariance includes thermal noise conditional on one fiducial light cone but not cosmic variance or foreground residuals; the results are, therefore, relative information comparisons, not survey forecasts or a demonstration of superiority over a full three-dimensional PS analysis.
Related
- HierArchical Wavelet Coefficients on the Sphere (HAWCS): the Scattering Transform on Spherical Maps
- Generative and deterministic deep learning models comparison for fine-scale precipitation retrievals from infrared brightness temperature
- FSSDataBase: a reconstructable dataset of simulated frequency-selective surface structures and scattering responses
- Signatures of bi-altermagnetism revealed by sublattice-specific circular dichroism in resonant inelastic X-ray scattering
- Signatures of Narrowband and Ultrashort-Pulse-Like Probing in Coherent Anti-Stokes Raman Scattering Using Twin Beams and Sum-Frequency Generation Readout
BibTeX
@article{shimabukuro2026waveletscattering,
title = {{Wavelet-scattering Signatures of Fuzzy Dark Matter in Simulated 21 cm Brightness–Temperature Maps}},
author = {Hayato Shimabukuro and Shihang Liu and Bohua Li},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aea4a6},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea4a6},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Wavelet-scattering Signatures of Fuzzy Dark Matter in Simulated 21 cm Brightness–Temperature Maps
AU - Hayato Shimabukuro
AU - Shihang Liu
AU - Bohua Li
PY - 2026
DA - 2026/10/06
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aea4a6
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aea4a6
AB - We study the effect of fuzzy dark matter (FDM) on the multiscale morphology of simulated redshifted 21 cm maps during Cosmic Dawn and the Epoch of Reionization. Using FDM-modified 21cmFAST light cones, we apply the two-dimensional wavelet scattering transform (WST) to matched 2 MHz map products. The first-order coefficients S ₁ ( j ) summarize wavelet-band amplitudes, while the normalized second-order ratio R = S ₂ / S ₁ ( j ₁ ) measures ordered cross-scale modulation. FDM shifts and reshapes both summaries through delayed halo and source formation. We compare a two-dimensional power spectrum (PS), WST, and their combination on the same transferred and noisy maps. In this controlled local Fisher analysis, PS+WST reduces the marginalized errors on the FDM mass, effective X-ray emissivity normalization, and ionizing efficiency by approximately a factor of 1.8 relative to the matched two-dimensional PS baseline, although the dominant mass-heating degeneracy remains. An idealized three-wedge test shows that R is less reshaped at the coefficient level than S ₁ . The covariance includes thermal noise conditional on one fiducial light cone but not cosmic variance or foreground residuals; the results are, therefore, relative information comparisons, not survey forecasts or a demonstration of superiority over a full three-dimensional PS analysis.
SN - 0004-637X
SN - 1538-4357
ER -