Kavli Affiliate: Eiichiro Komatsu
| Summary:
We use the monopole and quadrupole power spectra of [ionO2]-emitting galaxies in the HETDEX Public Data Release 1 to constrain the growth of cosmic structures at $zle0.48$. We interpret the power spectra using a simulation-based model built from the Mucho-Uchuu-1G $N$-body simulation. The best-fit model reproduces the observed power spectra remarkably well up to $k_mathrmmax=0.7~h~mathrmMpc^-1$, and goodness-of-fit tests confirm that the HETDEX [ionO2] clustering is consistent with the textitPlanck flat $Λ$CDM cosmology. We test the general relativity (GR) prediction for the linear growth index, $γsimeq 0.55$. When the Alcock-Paczyński parameters are held fixed at their fiducial values, we find consistency with the GR prediction, $γ=0.55pm 0.05$. And, when the AP parameters are allowed to vary, $γ=0.60pm 0.07$, which is consistent with both the GR prediction and the suppressed growth rate reported by citetNguyen_2023. These results establish HETDEX [ionO2] galaxies as a competitive, independent low-redshift probe of the growth of structures and motivate future full cosmological inference.
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