Modelling galaxy clustering on small scales to tighten constraints on dark energy and modified gravity

Wang, Yun

doi:10.1093/mnras/stw2602

Cited by 8 publications

(5 citation statements)

References 43 publications

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“…On the real space dark matter evolution part, we have measured, through a set of N-body simulations, the non-linear evolution of the JCAP05(2017)030 dark matter velocity field and its relation with the dark matter density field [46]. The result of non-linear density-velocity relation has been used in BOSS data analysis [56,57] and is proved to be robust in measuring the cosmological structure growth rate.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the multi-streaming effect in redshift space distortion

Zheng

Zhang

2017

J. Cosmol. Astropart. Phys.

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Abstract. Both multi-streaming (random motion) and bulk motion cause the Finger-ofGod (FoG) effect in redshift space distortion (RSD). We apply a direct measurement of the multi-streaming effect in RSD from simulations, proving that it induces an additional, non-negligible FoG damping to the redshift space density power spectrum. We show that, including the multi-streaming effect, the RSD modelling is significantly improved. We also provide a theoretical explanation based on halo model for the measured effect, including a fitting formula with one to two free parameters. The improved understanding of FoG helps break the f σ 8 − σ v degeneracy in RSD cosmology, and has the potential of significantly improving cosmological constraints.

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Section: Introductionmentioning

confidence: 99%

Quantification of the multi-streaming effect in redshift space distortion

Zheng

Zhang

2017

J. Cosmol. Astropart. Phys.

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“…Reid et al (2014) were able to constrain the growth rate of structure with a 2.5 percent precision using CMASS galaxy sample, better than the conventional large scale RSD analysis of the same sample by a factor of two. Subsequent similar works have improved the modelling (Kwan et al 2015;Wang 2017;Nishimichi et al 2019;Zhai et al 2019a).…”

Section: Small Scale Clusteringmentioning

confidence: 98%

“…General discussion of these observational probes in the context of cosmic acceleration can be found in the relevant reviews, e.g., Frieman, Turner, & Huterer (2008), Wang (2010), and Weinberg et al (2013). Our forecasts in this paper draw heavily on the methodology developed by Wang et al (2010); Wang (2012); Wang, Chuang, & Hirata (2013); Wang (2017) and Zhai et al (2019b). As an illustration for broader applications in extragalactic astrophysics, we note that Roman is capable of carrying out a deep galaxy survey over 20 deg 2 in ∼ 5 days, with the same depth as the influential near-IR grism survey of the 3D-HST Treasury Program (5σ line flux limits of 5×10 −17 erg/s/cm 2 for "typical objects", Brammer et al 2012;VanDokkum et al 2013;Momcheva et al 2016), but over an the area more than 100 times larger!…”

Section: Introductionmentioning

confidence: 99%

The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope

Wang,

Zhai,

Alavi

et al. 2021

Preprint

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The Nancy Grace Roman Space Telescope will conduct a High Latitude Spectroscopic Survey (HLSS) over a large volume at high redshift, using the near-IR grism (1.0-1.93 µm, R = 435 − 865) and the 0.28 deg 2 wide field camera. We present a reference HLSS which maps 2000 deg 2 and achieves an emission line flux limit of 10 −16 erg/s/cm 2 at 6.5σ, requiring ∼0.6 yrs of observing time. We summarize the flowdown of the Roman science objectives to the science and technical requirements of the HLSS. We construct a mock redshift survey over the full HLSS volume by applying a semi-analytic galaxy formation model to a cosmological N-body simulation, and use this mock survey to create pixel-level simulations of 4 deg 2 of HLSS grism spectroscopy. We find that the reference HLSS would measure ∼ 10 million Hα galaxy redshifts that densely map large scale structure at z = 1 − 2 and 2 million [OIII] galaxy redshifts that sparsely map structures at z = 2 − 3. We forecast the performance of this survey for measurements of the cosmic expansion history with baryon acoustic oscillations and the growth of large scale structure with redshift space distortions. We also study possible deviations from the reference design, and find that a deep HLSS at f line > 7 × 10 −17 erg/s/cm 2 over 4000 deg 2 (requiring ∼1.5 yrs of observing time) provides the most compelling stand-alone constraints on dark energy from Roman alone. This provides a useful reference for future optimizations. The reference survey, simulated data sets, and forecasts presented here will inform community decisions on the final scope and design of the Roman HLSS.

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“…In this work, we also adopt a different model to compare the results. In particular, we compare a model as demonstrated in Wang (2017):…”

Section: Power Spectrum Modelmentioning

confidence: 99%

Clustering in the Simulated H$α$ Galaxy Redshift Survey from Nancy Grace Roman Space Telescope

Zhai,

Chuang,

Wang

et al. 2020

Preprint

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We present a realistic 2000 deg 2 Hα galaxy mock catalog with 1 < z < 2 for the Nancy Grace Roman Space Telescope galaxy redshift survey, the High Latitude Spectroscopic Survey (HLSS), created using Galacticus, a semi-analytical galaxy formation model, and high resolution cosmological N-body simulations. Galaxy clustering can probe dark energy and test gravity via baryon acoustic oscillation (BAO) and redshift space distortion (RSD) measurements. Using our realistic mock as the simulated Roman HLSS data, and a covariance matrix computed using a large set of approximate mocks created using EZmock, we investigate the expected precision and accuracy of the BAO and RSD measurements using the same analysis techniques used in analyzing real data. We find that the Roman Hα galaxy survey alone can measure the angular diameter distance with 2% uncertainty, the Hubble parameter with 3-6% uncertainty, and the linear growth parameter with 7% uncertainty, in each of four redshift bins. Our realistic forecast illustrates the power of the Roman galaxy survey in probing the nature of dark energy and testing gravity.

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Modelling galaxy clustering on small scales to tighten constraints on dark energy and modified gravity

Cited by 8 publications

References 43 publications

Quantification of the multi-streaming effect in redshift space distortion

Quantification of the multi-streaming effect in redshift space distortion

The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope

Clustering in the Simulated H$α$ Galaxy Redshift Survey from Nancy Grace Roman Space Telescope

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