Evolution of structure growth during dark energy domination: Insights from the cross-correlation of DESI galaxies with CMB lensing and galaxy magnification
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866915306990993408 |
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| author | Sailer, Noah DeRose, Joseph Ferraro, Simone Chen, Shi-Fan Zhou, Rongpu White, Martin Kim, Joshua Madhavacheril, Mathew |
| author_facet | Sailer, Noah DeRose, Joseph Ferraro, Simone Chen, Shi-Fan Zhou, Rongpu White, Martin Kim, Joshua Madhavacheril, Mathew |
| contents | We use a Hybrid Effective Field Theory (HEFT) model to constrain the evolution of low-redshift $(z\lesssim0.4)$ matter fluctuations by cross-correlating DESI Bright Galaxy Survey (BGS) legacy imaging with the latest CMB lensing maps from Planck and ACT. Our tomographic BGS analysis finds that the evolution and amplitude of matter fluctuations align with CMB-conditioned $Λ$CDM predictions. When including DESI Baryon Acoustic Oscillation (BAO) measurements we obtain $σ_8 = 0.876^{+0.051}_{-0.067}$ from BGS alone. Jointly analyzing BGS and Luminous Red Galaxy (LRG) cross-correlations with the same CMB lensing maps yields $σ_8 = 0.791\pm0.021$. As a complementary approach we isolate the galaxy magnification signal from the cross-correlation of non-overlapping BGS and LRG photometric redshift bins, ruling out the null-magnification hypothesis at $11σ$. For the first time, we constrain structure growth from the (finite-difference calibrated) galaxy magnification signal and find $σ_8=0.720\pm0.047\,\,({\rm stat.})\pm0.050\,\,({\rm sys.})$ when adopting a linear bias model and including BAO data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_24385 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evolution of structure growth during dark energy domination: Insights from the cross-correlation of DESI galaxies with CMB lensing and galaxy magnification Sailer, Noah DeRose, Joseph Ferraro, Simone Chen, Shi-Fan Zhou, Rongpu White, Martin Kim, Joshua Madhavacheril, Mathew Cosmology and Nongalactic Astrophysics We use a Hybrid Effective Field Theory (HEFT) model to constrain the evolution of low-redshift $(z\lesssim0.4)$ matter fluctuations by cross-correlating DESI Bright Galaxy Survey (BGS) legacy imaging with the latest CMB lensing maps from Planck and ACT. Our tomographic BGS analysis finds that the evolution and amplitude of matter fluctuations align with CMB-conditioned $Λ$CDM predictions. When including DESI Baryon Acoustic Oscillation (BAO) measurements we obtain $σ_8 = 0.876^{+0.051}_{-0.067}$ from BGS alone. Jointly analyzing BGS and Luminous Red Galaxy (LRG) cross-correlations with the same CMB lensing maps yields $σ_8 = 0.791\pm0.021$. As a complementary approach we isolate the galaxy magnification signal from the cross-correlation of non-overlapping BGS and LRG photometric redshift bins, ruling out the null-magnification hypothesis at $11σ$. For the first time, we constrain structure growth from the (finite-difference calibrated) galaxy magnification signal and find $σ_8=0.720\pm0.047\,\,({\rm stat.})\pm0.050\,\,({\rm sys.})$ when adopting a linear bias model and including BAO data. |
| title | Evolution of structure growth during dark energy domination: Insights from the cross-correlation of DESI galaxies with CMB lensing and galaxy magnification |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.24385 |