AbacusPNG: A modest set of simulations of local-type primordial non-Gaussianity in the DESI era
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2024
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| _version_ | 1866912911642853376 |
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| author | Hadzhiyska, Boryana Garrison, Lehman Eisenstein, Daniel J. Ferraro, Simone |
| author_facet | Hadzhiyska, Boryana Garrison, Lehman Eisenstein, Daniel J. Ferraro, Simone |
| contents | A measurement of a primordial non-Gaussianity (PNG) signal through late- or early-Universe probes has the potential to transform our understanding of the physics of the primordial Universe. $N$-body simulations, such as the public \textsc{AbacusPNG} set presented in this study, consisting of 9 boxes, each of size $L_{\rm box} = 2~{\rm Gpc}/h$ and particle mass of $1.01 \times 10^{10} \ M_\odot/h$, provide a viable path forward. As validation, we find good agreement between the simulations and our expectations from one-loop perturbation theory and the `separate universe' method for the matter bispectrum, matter power spectrum and the halo bias parameter associated with PNG, $b_ϕ$. As a science application, we investigate the link between halo assembly bias and $b_ϕ$ for halo properties known to play a vital role in accurately predicting galaxy clustering: concentration, shear (environment), and accretion rate. We find a strong response for all three parameters, suggesting that the connection between $b_ϕ$ and the assembly history of halos needs to be taken into account by future PNG analyses. We further perform the first study of the $b_ϕ$ parameter from fits to early DESI data of the luminous red galaxy (LRG) and quasi-stellar object (QSO) samples and comment on the effect on $f_{\rm NL}$ constraints for the allowed galaxy-halo models (note that $σ[f_{\rm NL}] \propto \frac{σ[b_ϕ]}{b_ϕ}$). We find that the error on $f_{\rm NL}$ is 21, 6, 22 for the LRGs at $z = 0.5$ and $z = 0.8$ and QSOs at $z = 1.4$, respectively, suggesting that a thorough understanding of galaxy assembly bias is warranted so as to perform robust high-precision analysis of local-type PNG with future surveys. Simulations publicly available at https://app.globus.org/file-manager?origin_id=ffc65d7a-0bf9-11ec-90b4-41052087bc27 |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_10881 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | AbacusPNG: A modest set of simulations of local-type primordial non-Gaussianity in the DESI era Hadzhiyska, Boryana Garrison, Lehman Eisenstein, Daniel J. Ferraro, Simone Cosmology and Nongalactic Astrophysics A measurement of a primordial non-Gaussianity (PNG) signal through late- or early-Universe probes has the potential to transform our understanding of the physics of the primordial Universe. $N$-body simulations, such as the public \textsc{AbacusPNG} set presented in this study, consisting of 9 boxes, each of size $L_{\rm box} = 2~{\rm Gpc}/h$ and particle mass of $1.01 \times 10^{10} \ M_\odot/h$, provide a viable path forward. As validation, we find good agreement between the simulations and our expectations from one-loop perturbation theory and the `separate universe' method for the matter bispectrum, matter power spectrum and the halo bias parameter associated with PNG, $b_ϕ$. As a science application, we investigate the link between halo assembly bias and $b_ϕ$ for halo properties known to play a vital role in accurately predicting galaxy clustering: concentration, shear (environment), and accretion rate. We find a strong response for all three parameters, suggesting that the connection between $b_ϕ$ and the assembly history of halos needs to be taken into account by future PNG analyses. We further perform the first study of the $b_ϕ$ parameter from fits to early DESI data of the luminous red galaxy (LRG) and quasi-stellar object (QSO) samples and comment on the effect on $f_{\rm NL}$ constraints for the allowed galaxy-halo models (note that $σ[f_{\rm NL}] \propto \frac{σ[b_ϕ]}{b_ϕ}$). We find that the error on $f_{\rm NL}$ is 21, 6, 22 for the LRGs at $z = 0.5$ and $z = 0.8$ and QSOs at $z = 1.4$, respectively, suggesting that a thorough understanding of galaxy assembly bias is warranted so as to perform robust high-precision analysis of local-type PNG with future surveys. Simulations publicly available at https://app.globus.org/file-manager?origin_id=ffc65d7a-0bf9-11ec-90b4-41052087bc27 |
| title | AbacusPNG: A modest set of simulations of local-type primordial non-Gaussianity in the DESI era |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.10881 |