The BINGO Project VII: Cosmological Forecasts from 21cm Intensity Mapping

Abstract

The 21cm line of neutral hydrogen (HI) opens a new avenue in our exploration of the structure and evolution of the Universe. It provides complementary data to the current large-scale structure observations with different systematics, and thus it will be used to improve our understanding of the $\Lambda$CDM model. Among several radio cosmological surveys designed to measure this line, BINGO is a single-dish telescope mainly designed to detect baryon acoustic oscillations (BAOs) at low redshifts ($0.127<z<0.449$). Our goal is to assess the fiducial BINGO setup and its capabilities of constraining the cosmological parameters, and to analyze the effect of different instrument configurations. We used the Phase 1 fiducial configuration of the BINGO telescope to perform our cosmological forecasts. In addition, we investigated the impact of several instrumental setups, taking into account some instrumental systematics, and different cosmological models. Combining BINGO with Planck temperature and polarization data, the projected constraint improves from a $13\%$ and $25\%$ precision measurement at the $68\%$ confidence level with Planck only to $1\%$ and $3\%$ for the Hubble constant and the dark energy equation of state (EoS), respectively, within the wCDM model. Assuming a Chevallier-Polarski-Linder parameterization, the EoS parameters have standard deviations given by ${\sigma }_{w_0}=0.30$ and ${\sigma }_{w_a}=1.2$, which are improvements on the order of $30\%$ with respect to Planck alone. Also, we can access information about the HI density and bias, obtaining $\sim 8.5\%$ and $\sim 6\%$ precision, respectively, assuming they vary with redshift at three independent bins. The fiducial BINGO configuration will be able to extract significant cosmological information from the HI distribution and provide constraints competitive with current and future cosmological surveys. (Abridged)

arXiv comment22 pages, accepted for publication in A&A

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• The BINGO Project I: Baryon Acoustic Oscillations from Integrated Neutral Gas Observations
• An Effective Sign Switching Dark Energy: Lotka-Volterra Model of Two Interacting Fluids
• The BINGO Project II: Instrument Description
• The BINGO Project VI: HI Halo Occupation Distribution and Mock Building
• The BINGO Project V: Further steps in Component Separation and Bispectrum Analysis
• A note on interacting holographic dark energy with a Hubble-scale cutoff
• The BINGO Project IV: Simulations for mission performance assessment and preliminary component separation steps
• Cosmological Probes of Structure Growth and Tests of Gravity
• Constraints on interacting dark energy revisited: implications for the Hubble tension
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• Cosmological constraints from low redshift 21 cm intensity mapping with machine learning
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