Probing the primordial Universe with MeerKAT and DES

Fonseca, José; Maartens, Roy; Santos, Mário G.

doi:10.1093/mnras/stw3248

Cited by 39 publications

(42 citation statements)

References 36 publications

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“…Intensity mapping surveys may also be helpful because they can add high redshift information (e.g. see [93] for f NL ). On the CMB side, it would be interesting to study how close the Simons Observatory [4] in combination with pre-LSST LSS surveys can get to the CMB-S4/LSST forecasts presented here.…”

Section: Discussionmentioning

confidence: 99%

Parameter constraints from cross-correlation of CMB lensing with galaxy clustering

2018

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The lensing convergence measurable with future CMB surveys like CMB-S4 will be highly correlated with the clustering observed by deep photometric large scale structure (LSS) surveys such as the LSST, with cross-correlation coefficient as high as 95%. This will enable use of sample variance cancellation techniques to determine cosmological parameters, and use of cross-correlation measurements to break parameter degeneracies. Assuming large sky overlap between CMB-S4 and LSST, we show that a joint analysis of CMB-S4 lensing and LSST clustering can yield very tight constraints on the matter amplitude σ8(z), halo bias, and fNL, competitive with the best stage IV experiment predictions, but using complementary methods, which may carry different and possibly lower systematics. Having no sky overlap between experiments degrades the precision of σ8(z) by a factor of 20, and that of fNL by a factor of 1.5 to 2. Without CMB lensing, the precision always degrades by an order of magnitude or more, showing that a joint analysis is critical. Our results also suggest that CMB lensing in combination with LSS photometric surveys is a competitive probe of the evolution of structure in the redshift range z 1 − 7, probing a regime that is not well tested observationally. We explore predictions against other surveys and experiment configurations, finding that wide patches with maximal sky overlap between CMB and LSS surveys are most powerful for σ8(z) and fNL.

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Section: Discussionmentioning

confidence: 99%

Parameter constraints from cross-correlation of CMB lensing with galaxy clustering

2018

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“…A strong effort in forecasting the possible imprint of primordial non-Gaussianity in LSS has been pushing the limits to order O(1) for local-type non-Gaussianities 14 and O(10) for equilateral and orthogonal ones [16,19,21,30,280,281,285,343,. Several future surveys such as SPHEREx [16], Euclid [408], MeerKAT+DES [411] and SKA [19] might achieve these limits. and we used Bayes' theorem to write N (ν, J 1 ) = N (ν) N (J 1 |ν) and consequently written the conditional gaussian distribution P G (x − µ; s) with shifted mean µ = γ 1 ν and variance s = 1 − γ 2 1 .…”

Section: Observational Prospectsmentioning

confidence: 99%

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe

Biagetti

2019

Galaxies

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The understanding of the primordial mechanism that seeded the cosmic structures we observe today in the sky is one of the major goals in cosmology. The leading paradigm for such a mechanism is provided by the inflationary scenario, a period of violent accelerated expansion in the very early stages of evolution of the universe. While our current knowledge of the physics of inflation is limited to phenomenological models which fit observations, an exquisite understanding of the particle content and interactions taking place during inflation would provide breakthroughs in our understanding of fundamental physics at high energies. In this review, we summarize recent theoretical progress in the modeling of the imprint of primordial interactions in the large-scale structures of the universe. We focus specifically on the effects of such interactions on the statistical distribution of dark-matter halos, providing a consistent treatment of the steps required to connect the correlations generated among fields during inflation all the way to the late-time correlations of halos.

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“…Cosmic variance can be beaten down using multiple tracers, and this is applied to MeerKAT and DES in [18]. It is shown that the multi-tracer technique can achieve errors on f NL better than those of Planck, even with a conservative assumption on the overlap sky area between MeerKAT and DES (3,000 or 4000 deg 2 ), and with a maximum of 4000 hr integration time (σ ( f NL ) ∼ 3.6 in L-band and 2.3 in UHF).…”

Section: Multi-tracer Constraints On Primordial Non-gaussianitymentioning

confidence: 99%

A Large Sky Survey with MeerKAT

Santos¹,

Bull²,

Camera³

et al. 2018

Proceedings of MeerKAT Science: On the Pathway to the SKA — PoS(MeerKAT2016)

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We discuss the ground-breaking science that will be possible with a wide area survey, using the MeerKAT telescope, known as MeerKLASS (MeerKAT Large Area Synoptic Survey). The current specifications of MeerKAT make it a great fit for cosmological applications, which require large volumes. In particular, a large survey over ∼ 4, 000 deg 2 for ∼ 4, 000 hours will potentially provide the first ever measurements of the baryon acoustic oscillations using the 21cm intensity mapping technique, with enough accuracy to impose constraints on the nature of dark energy. The combination with multi-wavelength data will give unique additional information, such as the first constraints on primordial non-Gaussianity using the multi-tracer technique, as well as a better handle on foregrounds and systematics. The survey will also produce a large continuum galaxy sample down to a depth of 5 µJy in L-band, unmatched by any other concurrent telescope, which will allow to study the large-scale structure of the Universe out to high redshifts. Finally, the same survey will supply unique information for a range of other science applications, including a large statistical investigation of galaxy clusters, and the discovery of rare high-redshift AGN that can be used to probe the epoch of reionization as well as produce a rotation measure map across a huge swathe of the sky. The MeerKLASS survey will be a crucial step on the road to using SKA1-MID for cosmological applications, as described in the top priority SKA key science projects.

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Probing the primordial Universe with MeerKAT and DES

Cited by 39 publications

References 36 publications

Parameter constraints from cross-correlation of CMB lensing with galaxy clustering

Parameter constraints from cross-correlation of CMB lensing with galaxy clustering

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe

A Large Sky Survey with MeerKAT

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