Two-season Atacama Cosmology Telescope polarimeter lensing power spectrum

Sherwin, Blake D.; Engelen, Alexander van; Sehgal, Neelima; Madhavacheril, Mathew S.; Addison, Graeme E.; Aiola, Simone; Allison, Rupert; Battaglia, Nicholas; Becker, Daniel; Beall, James A.; Bond, J. R.; Calabrese, E.; Datta, Rahul; Devlin, Mark J.; Dünner, Rolando; Dunkley, Joanna; Fox, Anna E.; Gallardo, Patricio A.; Halpern, M.; Hasselfield, Matthew; Henderson, S.; Hill, J. Colin; Hilton, G. C.; Hubmayr, Johannes; Hughes, John P.; Hincks, Adam D.; Hložek, Renée; Huffenberger, K. M.; Koopman, Brian J.; Kosowsky, Arthur; Louis, Thibaut; Maurin, Loïc; McMahon, Jeff; Moodley, Kavilan; Næss, Sigurd; Nati, F.; Newburgh, Laura; Niemack, Michael D.; Page, Lyman A.; Sievers, Jonathan; Spergel, David N.; Staggs, Suzanne T.; Thornton, Robert J.; Lanen, Jeff Van; Vavagiakis, Eve M.; Wollack, Edward J.

doi:10.1103/physrevd.95.123529

Cited by 138 publications

(138 citation statements)

References 67 publications

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“…After numerous detections with data from ground-based telescopes (e.g. [2][3][4][5]) and the WMAP and Planck satellites (e.g. [6][7][8]), a base set of analysis techniques is now well-established.…”

Section: Introductionmentioning

confidence: 99%

Baryonic effects on CMB lensing and neutrino mass constraints

2020

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Measurements of gravitational lensing of the cosmic microwave background (CMB) hold the promise of yielding unique insights into cosmology at high redshift. Uncertainties due to baryonic effects associated with galaxy formation and evolution, including gas cooling, star formation, and feedback from active galactic nuclei (AGN) and supernovae, have typically been neglected when forecasting the sensitivity of future CMB surveys. In this paper, we determine the impact of these effects using four suites of hydrodynamical simulations which incorporate various prescriptions for baryonic processes, namely OWLS, BAHAMAS, Horizon, and IllustrisTNG. Our analysis shows characteristic power suppressions of several percent in CMB lensing due to baryonic effects, compared to dark-matter only simulations, at experimentally observable angular scales. We investigate the associated bias in the inferred neutrino mass for experiments like the upcoming Simons Observatory and CMB-S4. Depending on the experimental precision and the strength of the baryonic feedback within the simulations, biases in the neutrino mass sum show significant dispersion, ranging from very small to an over-estimation by 1.1σ. We conclude that baryonic effects will likely be non-negligible for a detection of neutrino mass using CMB lensing.

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Section: Introductionmentioning

confidence: 99%

Baryonic effects on CMB lensing and neutrino mass constraints

2020

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“…With this information theory bound we can place limits on the string detection possible. We evaluate the bound and present the limits this bound places on the string tension for experiments like the the Atacama Cosmology Telescope (ACT) (Louis et al 2017;Sherwin et al 2017), the South Pole Telescope 3G (SPT-3G) (Benson et al 2014), the Simons Observatory (SO) (Ade et al 2019), the Cosmic Origins Explorer (CORE) (Delabrouille et al 2018) and the CMB-S4 (Abazajian et al 2019). The results of these bounds are presented in table 1.…”

Section: Introductionmentioning

confidence: 99%

Information theoretic bounds on cosmic string detection in CMB maps with noise

Ciuca

Hernández

2019

Monthly Notices of the Royal Astronomical Society

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We use a convolutional neural network (CNN) to study cosmic string detection in cosmic microwave background (CMB) flat sky maps with Nambu-Goto strings. On noiseless maps we can measure string tensions down to order 10 −9 , however when noise is included we are unable to measure string tensions below 10 −7 . Motivated by this impasse, we derive an information theoretic bound on the detection of the cosmic string tension Gµ from CMB maps. In particular we bound the information entropy of the posterior distribution of Gµ in terms of the resolution, noise level and total survey area of the CMB map. We evaluate these bounds for the ACT, SPT-3G, Simons Observatory, Cosmic Origins Explorer, and CMB-S4 experiments. These bounds cannot be saturated by any method.

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“…Reconstructed maps of the CMB lensing deflections have been made with data from ground-based instruments (e.g., refs. [14][15][16][17][18]) and from the Planck satellite [7,19]. Due to its nearly full-sky coverage, the Planck lensing results currently have the greatest statistical power but are very far from exhausting the information available in the lensed CMB.…”

Section: Jcap04(2018)018mentioning

confidence: 99%

“…The EB estimator for large scale lenses is only sensitive to shear as the dilation of small-scale polarization by a constant convergence does not convert E-mode polarization into B-mode. 2 Polarization-based lens reconstructions have been demonstrated recently from ground-based experiments [14][15][16][17], and also Planck, but are currently very noisy. Future, funded wide-area CMB surveys (see S3-wide in figure 1, which has specifications similar to AdvACT) also do not have the sensitivity to exploit polarizationbased lensing fully.…”

Section: Jcap04(2018)018mentioning

confidence: 99%

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Exploring cosmic origins with CORE: Gravitational lensing of the CMB

Challinor

Allison

Carron

et al. 2018

J. Cosmol. Astropart. Phys.

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Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of a clean map of the lensing deflections over nearly the full-sky. The number of high-S/N modes in this map will exceed current CMB lensing maps by a factor of 40, and the measurement will be sample-variance limited on all scales where linear theory is valid. Here, we summarise this mission product and discuss the science that will follow from its power spectrum and the cross-correlation with other clustering data. For example, the summed mass of neutrinos will be determined to an accuracy of 17 meV combining CORE lensing and CMB two-point information with contemporaneous measurements of the baryon acoustic oscillation feature in the clustering of galaxies, three times smaller than the minimum total mass allowed by neutrino oscillation measurements. Lensing has applications across many other science goals of CORE, including the search for B-mode polarization from primordial gravitational waves. Here, lens-induced B-modes will dominate over instrument noise, limiting constraints on the power spectrum amplitude of primordial gravitational waves. With lensing reconstructed by CORE, one can “delens” the observed polarization internally, reducing the lensing B-mode power by 60 %. This can be improved to 70 % by combining lensing and measurements of the cosmic infrared background from CORE, leading to an improvement of a factor of 2.5 in the error on the amplitude of primordial gravitational waves compared to no delensing (in the null hypothesis of no primordial B-modes). Lensing measurements from CORE will allow calibration of the halo masses of the tens of thousands of galaxy clusters that it will find, with constraints dominated by the clean polarization-based estimators. The 19 frequency channels proposed for CORE will allow accurate removal of Galactic emission from CMB maps. We present initial findings that show that residual Galactic foreground contamination will not be a significant source of bias for lensing power spectrum measurements with CORE.

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Two-season Atacama Cosmology Telescope polarimeter lensing power spectrum

Cited by 138 publications

References 67 publications

Baryonic effects on CMB lensing and neutrino mass constraints

Baryonic effects on CMB lensing and neutrino mass constraints

Information theoretic bounds on cosmic string detection in CMB maps with noise

Exploring cosmic origins with CORE: Gravitational lensing of the CMB

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