Simulating intergalactic gas for DESI-like small scale Lymanα forest observations

Walther, Michael; Armengaud, Eric; Ravoux, Corentin; Palanque-Delabrouille, Nathalie; Yèche, Christophe; Lukić, Zarija

doi:10.48550/arxiv.2012.04008

Cited by 5 publications

(5 citation statements)

References 87 publications

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“…in preparation). This approach has also been used in studies such as the EuclidEmulator (Euclid Collaboration et al 2019) to model the non-linear corrections to the dark matter power spectrum in preparation for the Euclid mission, the DARK EMULATOR (Nishimichi et al 2019;Kobayashi et al 2020;Miyatake et al 2020) for dark matter halo statistics over a wide redshift range, extensions to ΛCDM cosmologies (Giblin et al 2019;Ramachandra et al 2020), baryonic effects in the matter power spectrum (Aricò et al 2020), the modeling of the Lyman-α forest flux power spectrum (Bird et al 2019;Rogers et al 2019;Walther et al 2020;Pedersen et al 2020), galaxy lensing and clustering for BOSS-LOWZ galaxies (Wibking et al 2017(Wibking et al , 2020, weak lensing signal of galaxy clusters (Salcedo et al 2020), and so on.…”

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confidence: 99%

The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies

Zhai¹,

Tinker²,

Banerjee³

et al. 2022

Preprint

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We analyze clustering measurements of BOSS galaxies using a simulation-based emulator of two-point statistics. We focus on the monopole and quadrupole of the redshift-space correlation function, and the projected correlation function, at scales of 0.1 ∼ 60 h −1 Mpc. Although our simulations are based on wCDM with general relativity (GR), we include a scaling parameter of the halo velocity field, γ f , defined as the amplitude of the halo velocity field relative to the GR prediction. We divide the BOSS data into three redshift bins. After marginalizing over other cosmological parameters, galaxy bias parameters, and the velocity scaling parameter, we find f σ 8 (z = 0.25) = 0.404 ± 0.03, f σ 8 (z = 0.4) = 0.444 ± 0.025 and f σ 8 (z = 0.55) = 0.385 ± 0.019. Compared with Planck observations using a flat ΛCDM model, our results are lower by 2.29σ, 1.3σ and 4.58σ respectively. These results are consistent with other recent simulation-based results at non-linear scales, including weak lensing measurements of BOSS LOWZ galaxies, two-point clustering of eBOSS LRGs, and an independent clustering analysis of BOSS LOWZ. All these results are generally consistent with a combination of γ 1/2 f σ 8 ≈ 0.75. We note, however, that the BOSS data is well fit assuming GR, i.e. γ f = 1. We cannot rule out an unknown systematic error in the galaxy bias model at non-linear scales, but near-future data and modeling will enhance our understanding of the galaxy-halo connection, and provide a strong test of new physics beyond the standard model.

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confidence: 99%

The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies

Zhai¹,

Tinker²,

Banerjee³

et al. 2022

Preprint

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“…As a somewhat more aggressive alternative, we follow [59] and use an estimate of 1% for the relative error at all k-and z-values. We keep the same range for k and z as in our previous analysis, covering the region of validity of the effective model.…”

Section: Prospectsmentioning

confidence: 99%

Neutrino mass bounds from confronting an effective model with BOSS Lyman-α data

Garny

Konstandin

Sagunski

et al. 2021

J. Cosmol. Astropart. Phys.

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We present an effective model for the one-dimensional Lyman-α flux power spectrum far above the baryonic Jeans scale. The main new ingredient is constituted by a set of two parameters that encode the impact of small, highly non-linear scales on the one-dimensional power spectrum on large scales, where it is measured by BOSS. We show that, by marginalizing over the model parameters that capture the impact of the intergalactic medium, the flux power spectrum from both simulations and observations can be described with high precision. The model displays a degeneracy between the neutrino masses and the (unknown, in our formalism) normalization of the flux power spectrum. This degeneracy can be lifted by calibrating one of the model parameters with simulation data, and using input from Planck CMB data. We demonstrate that this approach can be used to extract bounds on the sum of neutrino masses with comparably low numerical effort, while allowing for a conservative treatment of uncertainties from the dynamics of the intergalactic medium. An explorative analysis yields an upper bound of 0.16eV at 95% C.L. when applied to BOSS data at 3 ≤ z ≤ 4.2. We also forecast that if the systematic and statistical errors will be reduced by a factor two the upper bound will become 0.1eV at 95% C.L, and 0.056eV when assuming a 1% error.

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“…The current upper bound from Lyman-α measurements alone is Σm ν < 0.71 eV (95% CL) [106]. Probing cosmological parameters with the Lyman-alpha forest is also challenging because of observational and astrophysical systematics, which need to be modeled in the analyses [110,111].…”

Section: Theoretical Background a Neutrino Mass Constraints From Cosm...mentioning

confidence: 99%

Reconstruction of the neutrino mass as a function of redshift

Lorenz,

Funcke,

Löffler

et al. 2021

Preprint

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We reconstruct the neutrino mass as a function of redshift, z, from current cosmological data using both standard binned priors and linear spline priors with variable knots. Using cosmic microwave background temperature, polarization and lensing data, in combination with distance measurements from baryonic acoustic oscillations and supernovae, we find that the neutrino mass is consistent with mν (z) = const. We obtain a larger bound on the neutrino mass at low redshifts coinciding with the onset of dark energy domination, mν (z = 0) < 1.41 eV (95% CL). This result can be explained either by the well-known degeneracy between mν and ΩΛ at low redshifts, or by models in which neutrino masses are generated very late in the Universe. We convert our results into cosmological limits for models with post-recombination neutrino decay and find mν < 0.19 eV (95% CL), which is below the sensitivity of the KATRIN experiment. Thus, a neutrino mass discovery by KATRIN would hint towards models predicting both post-recombination neutrino mass generation and subsequent relic neutrino annihilation.

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Simulating intergalactic gas for DESI-like small scale Lymanα forest observations

Cited by 5 publications

References 87 publications

The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies

The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies

Neutrino mass bounds from confronting an effective model with BOSS Lyman-α data

Reconstruction of the neutrino mass as a function of redshift

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