scholarly journals On the degeneracy between baryon feedback and massive neutrinos as probed by matter clustering and weak lensing

2019 ◽  
Vol 2019 (01) ◽  
pp. 010-010 ◽  
Author(s):  
Gabriele Parimbelli ◽  
Matteo Viel ◽  
Emiliano Sefusatti
Keyword(s):  
Weak Lensing ◽  
Massive Neutrinos

scholarly journals κTNG: Effect of baryonic processes on weak lensing with IllustrisTNG simulations

2021 ◽  
Author(s):  
Ken Osato ◽  
Jia Liu ◽  
Zoltán Haiman
Keyword(s):  
Dark Matter ◽  
Weak Lensing ◽  
Small Scale ◽  
Fundamental Physics ◽  
Angular Power Spectrum ◽  
Hydrodynamic Simulations ◽  
Massive Neutrinos ◽  
Non Gaussian ◽  
Analytic Models ◽  
Number Counts

Abstract We study the effect of baryonic processes on weak lensing (WL) observables with a suite of mock WL maps, the κTNG, based on the cosmological hydrodynamic simulations IllustrisTNG. We quantify the baryonic effects on the WL angular power spectrum, one-point probability distribution function (PDF), and number counts of peaks and minima. We also show the redshift evolution of the effects, which is a key to distinguish the effect of baryons from fundamental physics such as dark energy, dark matter, and massive neutrinos. We find that baryonic processes reduce the small-scale power, suppress the tails of the PDF, peak and minimum counts, and change the total number of peaks and minima. We compare our results to existing semi-analytic models and hydrodynamic simulations, and discuss the source of discrepancies. The κTNG suite includes 10,000 realisations of 5 × 5 deg2 maps for 40 source redshifts up to zs = 2.6, well covering the range of interest for existing and upcoming weak lensing surveys. We also produce the κTNG-Dark suite of maps, generated based on the corresponding dark matter only IllustrisTNG simulations. Our mock maps are suitable for developing analytic models that incorporate the effect of baryons, but also particularly useful for studies that rely on mass maps, such as non-Gaussian statistics and machine learning with convolutional neural networks. The suite of mock maps is publicly available at Columbia Lensing (http://columbialensing.org).

scholarly journals The impact of baryonic physics and massive neutrinos on weak lensing peak statistics

2019 ◽  
Vol 488 (3) ◽  
pp. 3340-3357 ◽  
Author(s):  
Matthew Fong ◽  
Miyoung Choi ◽  
Victoria Catlett ◽  
Brandyn Lee ◽  
Austin Peel ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Large Scale ◽  
Cosmological Parameters ◽  
Mass Function ◽  
Weak Lensing ◽  
The Bahamas ◽  
Massive Neutrinos ◽  
Evolution Of Structure ◽  
The Impact ◽  
The Universe

ABSTRACT We study the impact of baryonic processes and massive neutrinos on weak lensing peak statistics that can be used to constrain cosmological parameters. We use the BAHAMAS suite of cosmological simulations, which self-consistently include baryonic processes and the effect of massive neutrino free-streaming on the evolution of structure formation. We construct synthetic weak lensing catalogues by ray tracing through light-cones, and use the aperture mass statistic for the analysis. The peaks detected on the maps reflect the cumulative signal from massive bound objects and general large-scale structure. We present the first study of weak lensing peaks in simulations that include both baryonic physics and massive neutrinos (summed neutrino mass Mν = 0.06, 0.12, 0.24, and 0.48 eV assuming normal hierarchy), so that the uncertainty due to physics beyond the gravity of dark matter can be factored into constraints on cosmological models. Assuming a fiducial model of baryonic physics, we also investigate the correlation between peaks and massive haloes, over a range of summed neutrino mass values. As higher neutrino mass tends to suppress the formation of massive structures in the Universe, the halo mass function and lensing peak counts are therefore modified as a function of Mν. Over most of the S/N range, the impact of fiducial baryonic physics is greater (less) than neutrinos for 0.06 and 0.12 (0.24 and 0.48) eV models. Both baryonic physics and massive neutrinos should be accounted for when deriving cosmological parameters from weak lensing observations.

scholarly journals Higher order spectra of weak lensing convergence maps in parametrized theories of modified gravity

2020 ◽  
Vol 498 (4) ◽  
pp. 5299-5316
Author(s):  
D Munshi ◽  
J D McEwen
Keyword(s):  
Modified Gravity ◽  
Arbitrary Order ◽  
Higher Order ◽  
Tree Level ◽  
Weak Lensing ◽  
The Family ◽  
Normal Branch ◽  
Massive Neutrinos ◽  
Higher Order Spectra ◽  
Good Agreement

ABSTRACT We compute the low-ℓ limit of the family of higher order spectra for projected (2D) weak lensing convergence maps. In this limit these spectra are computed to an arbitrary order using tree-level perturbative calculations. We use the flat-sky approximation and Eulerian perturbative results based on a generating function approach. We test these results for the lower order members of this family, i.e. the skew- and kurt-spectra against state-of-the-art simulated all-sky weak lensing convergence maps and find our results to be in very good agreement. We also show how these spectra can be computed in the presence of a realistic sky-mask and Gaussian noise. We generalize these results to 3D and compute the equal-time higher order spectra. These results will be valuable in analysing higher order statistics from future all-sky weak lensing surveys such as the Euclid survey at low-ℓ modes. As illustrative examples, we compute these statistics in the context of the Horndeski and beyond Horndeski theories of modified gravity. They will be especially useful in constraining theories such as the Gleyzes–Langlois–Piazza–Vernizzi (GLPV) theories and degenerate higher order scalar-tensor theories as well as the commonly used normal-branch of Dvali–Gabadadze–Porrati model, clustering quintessence models and scenarios with massive neutrinos.

scholarly journals Finding evidence for massive neutrinos using 3D weak lensing

2008 ◽  
Vol 77 (10) ◽  
Author(s):  
T. D. Kitching ◽  
A. F. Heavens ◽  
L. Verde ◽  
P. Serra ◽  
A. Melchiorri
Keyword(s):  
Weak Lensing ◽  
Massive Neutrinos

scholarly journals DEMNUni: ISW, Rees-Sciama, and weak-lensing in the presence of massive neutrinos

2016 ◽  
Vol 2016 (07) ◽  
pp. 034-034 ◽  
Author(s):  
Carmelita Carbone ◽  
Margarita Petkova ◽  
Klaus Dolag
Keyword(s):  
Weak Lensing ◽  
Massive Neutrinos

scholarly journals Breaking degeneracies in modified gravity with higher (than 2nd) order weak-lensing statistics

2018 ◽  
Vol 619 ◽  
pp. A38 ◽  
Author(s):  
Austin Peel ◽  
Valeria Pettorino ◽  
Carlo Giocoli ◽  
Jean-Luc Starck ◽  
Marco Baldi
Keyword(s):  
Modified Gravity ◽  
Gravitational Interaction ◽  
Higher Order ◽  
Density Fluctuations ◽  
Weak Lensing ◽  
Angular Scale ◽  
The Standard Model ◽  
Universal Expansion ◽  
Massive Neutrinos ◽  
Non Gaussian

General relativity (GR) has been well tested up to solar system scales, but it is much less certain that standard gravity remains an accurate description on the largest, that is cosmological, scales. Many extensions to GR have been studied that are not yet ruled out by the data, including by that of the recent direct gravitational wave detections. Degeneracies among the standard model (ΛCDM) and modified gravity (MG) models, as well as among different MG parameters, must be addressed in order to best exploit information from current and future surveys and to unveil the nature of dark energy. We propose various higher-order statistics in the weak-lensing signal as a new set of observables able to break degeneracies between massive neutrinos and MG parameters. We have tested our methodology on so-called f(R) models, which constitute a class of viable models that can explain the accelerated universal expansion by a modification of the fundamental gravitational interaction. We have explored a range of these models that still fit current observations at the background and linear level, and we show using numerical simulations that certain models which include massive neutrinos are able to mimic ΛCDM in terms of the 3D power spectrum of matter density fluctuations. We find that depending on the redshift and angular scale of observation, non-Gaussian information accessed by higher-order weak-lensing statistics can be used to break the degeneracy between f(R) models and ΛCDM. In particular, peak counts computed in aperture mass maps outperform third- and fourth-order moments.

scholarly journals Detecting Cold Dark Matter Candidates

1987 ◽  
Vol 117 ◽  
pp. 490-490
Author(s):  
A. K. Drukier ◽  
K. Freese ◽  
D. N. Spergel
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Galactic Halo ◽  
Dark Matter Particle ◽  
Low Energy ◽  
The Sun ◽  
Background Rate ◽  
System Noise ◽  
Weakly Interacting ◽  
Massive Neutrinos

We consider the use of superheated superconducting colloids as detectors of weakly interacting galactic halo candidate particles (e.g. photinos, massive neutrinos, and scalar neutrinos). These low temperature detectors are sensitive to the deposition of a few hundreds of eV's. The recoil of a dark matter particle off of a superheated superconducting grain in the detector causes the grain to make a transition to the normal state. Their low energy threshold makes this class of detectors ideal for detecting massive weakly interacting halo particles.We discuss realistic models for the detector and for the galactic halo. We show that the expected count rate (≈103 count/day for scalar and massive neutrinos) exceeds the expected background by several orders of magnitude. For photinos, we expect ≈1 count/day, more than 100 times the predicted background rate. We find that if the detector temperature is maintained at 50 mK and the system noise is reduced below 5 × 10−4 flux quanta, particles with mass as low as 2 GeV can be detected. We show that the earth's motion around the Sun can produce a significant annual modulation in the signal.

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