Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering
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| Format: | Preprint |
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2024
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| _version_ | 1866929594557267968 |
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| author | Chen, Shi-Fan Ivanov, Mikhail M. Philcox, Oliver H. E. Wenzl, Lukas |
| author_facet | Chen, Shi-Fan Ivanov, Mikhail M. Philcox, Oliver H. E. Wenzl, Lukas |
| contents | We present a new perturbative full-shape analysis of BOSS galaxy clustering data, including the full combination of the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with the gravitational lensing of cosmic microwave background measured from \textit{Planck}. Assuming the $Λ$CDM model, we constrain the matter density fraction $Ω_m = 0.3138\pm 0.0086$, the Hubble constant $H_0=68.23\pm 0.78\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$, and the mass fluctuation amplitude $σ_8=0.688\pm 0.026$ (equivalent to $S_8 = 0.703\pm 0.029$). Cosmic structure at low redshifts appears suppressed with respect to the Planck $Λ$CDM concordance model at $4.5σ$. We explore whether this tension can be explained by the recent DESI preference for dynamical dark energy (DDE): the BOSS data combine with DESI BAO and PantheonPlus supernovae competitively compared to the CMB, yielding no preference for DDE, but the same $\sim 10\%$ suppression of structure, with dark energy being consistent with a cosmological constant at 68\% CL. Our results suggest that either the data contains residual systematics, or more model-building efforts may be required to restore cosmological concordance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_13388 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering Chen, Shi-Fan Ivanov, Mikhail M. Philcox, Oliver H. E. Wenzl, Lukas Cosmology and Nongalactic Astrophysics We present a new perturbative full-shape analysis of BOSS galaxy clustering data, including the full combination of the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with the gravitational lensing of cosmic microwave background measured from \textit{Planck}. Assuming the $Λ$CDM model, we constrain the matter density fraction $Ω_m = 0.3138\pm 0.0086$, the Hubble constant $H_0=68.23\pm 0.78\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$, and the mass fluctuation amplitude $σ_8=0.688\pm 0.026$ (equivalent to $S_8 = 0.703\pm 0.029$). Cosmic structure at low redshifts appears suppressed with respect to the Planck $Λ$CDM concordance model at $4.5σ$. We explore whether this tension can be explained by the recent DESI preference for dynamical dark energy (DDE): the BOSS data combine with DESI BAO and PantheonPlus supernovae competitively compared to the CMB, yielding no preference for DDE, but the same $\sim 10\%$ suppression of structure, with dark energy being consistent with a cosmological constant at 68\% CL. Our results suggest that either the data contains residual systematics, or more model-building efforts may be required to restore cosmological concordance. |
| title | Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2406.13388 |