Density reconstruction from biased tracers and its application to primordial non-Gaussianity

Darwish, Omar; Foreman, Simon; Abidi, Muntazir; Baldauf, Tobias; Sherwin, Blake D.; Meerburg, P. Daniel

doi:10.1103/physrevd.104.123520

Cited by 13 publications

(14 citation statements)

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“…Beyond BAO, there is potential to constrain the linear growth rate of structures as a way to test general relativity (Obuljen et al 2018;Chen et al 2019), constrain models of cosmic inflation through signatures in the primordial power spectrum of fluctuations (Xu et al 2016;Beutler et al 2019) or non-Gaussian statistics in large-scale structure (Xu et al 2015;Karagiannis et al 2020), and probe the nature of dark matter (Carucci et al 2015;Bauer et al 2021). In addition, "tidal reconstruction" techniques, which reconstruct large-scale (foreground-obscured) modes from the correlations they induce between smaller-scale modes (Zhu et al 2018;Modi et al 2019;Darwish et al 2021), can greatly expand the opportunities for cross-correlations with surveys of the CMB or photometric galaxy redshifts. Additionally, lower-frequency observations of the 21 cm line are well suited to probing the era of reionization (Furlanetto et al 2019b) or, more ambitiously, the cosmic "dark ages" up to z 100 ( ) ~ (Furlanetto et al 2019a).…”

Section: Discussionmentioning

confidence: 99%

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

Amiri

Bandura

Boskovic

et al. 2022

ApJS

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The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400–800 MHz band. CHIME is located at the Dominion Radio Astrophysical Observatory near Penticton, BC, Canada. The instrument is designed to map neutral hydrogen over the redshift range 0.8–2.5 to constrain the expansion history of the universe. This goal drives the design features of the instrument. CHIME consists of four parallel cylindrical reflectors, oriented north–south, each 100 m × 20 m and outfitted with a 256-element dual-polarization linear feed array. CHIME observes a two-degree-wide stripe covering the entire meridian at any given moment, observing three-quarters of the sky every day owing to Earth’s rotation. An FX correlator utilizes field-programmable gate arrays and graphics processing units to digitize and correlate the signals, with different correlation products generated for cosmological, fast radio burst, pulsar, very long baseline interferometry, and 21 cm absorber back ends. For the cosmology back end, the N feed 2 correlation matrix is formed for 1024 frequency channels across the band every 31 ms. A data receiver system applies calibration and flagging and, for our primary cosmological data product, stacks redundant baselines and integrates for 10 s. We present an overview of the instrument, its performance metrics based on the first 3 yr of science data, and we describe the current progress in characterizing CHIME’s primary beam response. We also present maps of the sky derived from CHIME data; we are using versions of these maps for a cosmological stacking analysis, as well as for investigation of Galactic foregrounds.

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Section: Discussionmentioning

confidence: 99%

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

Amiri

Bandura

Boskovic

et al. 2022

ApJS

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, LSS tracers are biased in a unique way in the presence of local primordial non-Gaussianitys [59,60]. Whilst direct measurements of this bias are hindered by large scale cosmic variance, in principle through the use of multitracer analysis [61] constraints on local primordial non-Gaussianity can possibly be improved by almost an order of magnitude this decade [28,62,63].…”

Section: Primordial Non-gaussianitymentioning

confidence: 99%

The primordial information content of Rayleigh Anisotropies

Coulton,

Beringue,

Meerburg

2020

Preprint

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Anisotropies in the cosmic microwave background (CMB) are primarily generated by Thomson scattering of photons by free electrons. Around the time of recombination, the Thomson scattering probability quickly diminishes as the free electrons combine with protons to form neutral hydrogen. This production of neutral hydrogen enables a new type of scattering to occur: Rayleigh scattering of photons by hydrogen atoms. Unlike Thomson scattering, Rayleigh scattering is frequency dependent resulting in the generation of anisotropies with a different spectral dependence. Unfortunately the Rayleigh scattering efficiency rapidly decreases with the expansion of the neutral universe, with the result that only a small percentage of photons are scattered off of neutral hydrogen after recombination. Although the effect is very small, future CMB missions with higher sensitivity and improved frequency coverage are poised to measure the effect of Rayleigh scattering. The uncorrelated component of the Rayleigh anisotropies contains unique information on the primordial perturbations that could potentially be leveraged to expand our knowledge of the early universe. In this paper we explore whether measurements of Rayleigh scattering anisotropies can be used to constrain primordial non-Gaussianity and examine the hints of anomalies found by WMAP and Planck satellites. We show that the additional Rayleigh information has the potential to improve primordial non-Gaussianity constraints over pure Thompson constraints by 30%, or more. Primordial bispectra that are not of the local type benefit the most from these additional scatterings, which we attribute to the different scale dependence of the Rayleigh anisotropies. Unfortunately this different scaling means that Rayleigh measurements can not be used to constrain anomalies or features on large scales. On the other hand, anomalies that may persist to smaller scales, such as the potential power asymmetry seen in WMAP and Planck, could be improved by the addition of Rayleigh measurements.

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“…Beyond BAO, there is potential to constrain the linear growth rate of structures as a way to test general relativity (Obuljen et al 2018;Chen et al 2019;; constrain models of cosmic inflation through signatures in the primordial power spectrum of fluctuations (Xu et al 2016;Beutler et al 2019) or non-Gaussian statistics in large-scale structure (Xu et al 2015;Karagiannis et al 2020); and probe the nature of dark matter (Carucci et al 2015;Bauer et al 2021). In addition, "tidal reconstruction" techniques, which reconstruct large-scale (foreground-obscured) modes from the correlations they induce between smaller-scale modes (Zhu et al 2018;Modi et al 2019;Darwish et al 2021), can greatly expand the opportunities for cross-correlations with surveys of the cosmic microwave background or photometric galaxy redshifts. Additionally, lower-frequency observations of the 21 cm line are well-suited to probing the era of reionization (Furlanetto et al 2019a), or more ambitiously, the cosmic "dark ages" up to z ∼ O(100) (Furlanetto et al 2019b).…”

Section: Discussionmentioning

confidence: 99%

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

Amiri,

Bandura,

Boskovic

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400 MHz to 800 MHz band. CHIME is located at the Dominion Radio Astrophysical Observatory near Penticton, BC Canada. The instrument is designed to map neutral hydrogen over the redshift range 0.8 to 2.5 to constrain the expansion history of the Universe. This goal drives the design features of the instrument. CHIME consists of four parallel cylindrical reflectors, oriented north-south, each 100 m × 20 m and outfitted with a 256 element dual-polarization linear feed array. CHIME observes a two degree wide stripe covering the entire meridian at any given moment, observing 3/4 of the sky every day due to Earth rotation. An FX correlator utilizes FPGAs and GPUs to digitize and correlate the signals, with different correlation products generated for cosmological, fast radio burst, pulsar, VLBI, and 21 cm absorber backends. For the cosmology backend, the N 2 feed correlation matrix is formed for 1024 frequency channels across the band every 31 ms. A data receiver system applies calibration and flagging and, for our primary cosmological data product, stacks redundant baselines and integrates for 10 s. We present an overview of the instrument, its performance metrics based on the first three years of science data, and we describe the current progress in characterizing CHIME's primary beam response. We also present maps of the sky derived from CHIME data; we are using versions of these maps for a cosmological stacking analysis as well as for investigation of Galactic foregrounds.

show abstract

Density reconstruction from biased tracers and its application to primordial non-Gaussianity

Cited by 13 publications

References 100 publications

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

The primordial information content of Rayleigh Anisotropies

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

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