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Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing

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Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing. / Ballardini, Mario; Matthewson, William Luke; Maartens, Roy.

In: Monthly Notices of the Royal Astronomical Society, Vol. 489, No. 2, 01.10.2019, p. 1950-1956.

Research output: Contribution to journalArticle

Harvard

Ballardini, M, Matthewson, WL & Maartens, R 2019, 'Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing', Monthly Notices of the Royal Astronomical Society, vol. 489, no. 2, pp. 1950-1956. https://doi.org/10.1093/mnras/stz2258

APA

Ballardini, M., Matthewson, W. L., & Maartens, R. (2019). Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing. Monthly Notices of the Royal Astronomical Society, 489(2), 1950-1956. https://doi.org/10.1093/mnras/stz2258

Vancouver

Ballardini M, Matthewson WL, Maartens R. Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing. Monthly Notices of the Royal Astronomical Society. 2019 Oct 1;489(2):1950-1956. https://doi.org/10.1093/mnras/stz2258

Author

Ballardini, Mario ; Matthewson, William Luke ; Maartens, Roy. / Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 489, No. 2. pp. 1950-1956.

Bibtex

@article{f36a0b4b882247d09ed5427b4c204f20,
title = "Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing",
abstract = "Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multi-tracer approach. Furthermore we then include CMB lensing from a CMB Stage 4 experiment in the multi-tracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB-S4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.",
keywords = "astro-ph.CO, RCUK, STFC, ST/N000668/1",
author = "Mario Ballardini and Matthewson, {William Luke} and Roy Maartens",
note = "7 pages, 2 figures. Version accepted by MNRAS",
year = "2019",
month = "10",
day = "1",
doi = "10.1093/mnras/stz2258",
language = "English",
volume = "489",
pages = "1950--1956",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

RIS

TY - JOUR

T1 - Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing

AU - Ballardini, Mario

AU - Matthewson, William Luke

AU - Maartens, Roy

N1 - 7 pages, 2 figures. Version accepted by MNRAS

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multi-tracer approach. Furthermore we then include CMB lensing from a CMB Stage 4 experiment in the multi-tracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB-S4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.

AB - Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys – a 21cm intensity mapping survey and two photometric galaxy surveys – via the multi-tracer approach. Furthermore we then include CMB lensing from a CMB Stage 4 experiment in the multi-tracer, which can improve the constraints on bias parameters. We forecast σ(fNL) ≃ 0.9 (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB-S4 lensing. With CMB lensing, the precision on fNL improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of fNL, our results show that the combination of upcoming cosmological surveys could achieve σ(nNL) ≃ 0.12 (0.22) on the running index.

KW - astro-ph.CO

KW - RCUK

KW - STFC

KW - ST/N000668/1

U2 - 10.1093/mnras/stz2258

DO - 10.1093/mnras/stz2258

M3 - Article

VL - 489

SP - 1950

EP - 1956

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 2

ER -

ID: 15176421