Probing Wilson loops in AdS/QCD

Liu, Yizhuang; Zahed, Ismaïl

doi:10.1103/physrevd.91.055001

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…Given a catalogue of galaxies with shear and redshift estimates, there exist many ways to extract the lensing information that is required to constrain the underlying cosmological parameters that describe our Universe at its largest scales. The central approach adopted by the above-mentioned surveys starts with the measurement of a two-point summary statistics, either the configuration-space correlation function (as in Kilbinger et al 2013;Hildebrandt et al 2017;Troxel et al 2018;Hildebrandt et al 2018) or the Fourier-space power spectra (as in Liu et al 2015a;Köhlinger et al 2017;Hikage et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Cosmic shear covariance matrix in wCDM: Cosmology matters

Harnois-Déraps

Giblin

Joachimi

2019

A&A

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We present here the cosmo-SLICS, a new suite of simulations specially designed for the analysis of current and upcoming weak lensing data beyond the standard two-point cosmic shear. We sample the [Ω m , σ 8 , h, w 0 ] parameter space at 25 points organised in a Latin hyper-cube, spanning a range that contains most of the 2σ posterior distribution from ongoing lensing surveys. At each of these nodes we evolve a pair of N-body simulations in which the sampling variance is highly suppressed, and ray-trace the volumes 800 times to further increase the effective sky coverage. We extract a lensing covariance matrix from these pseudo-independent lightcones and show that it closely matches a brute-force construction based on an ensemble of 800 truly independent N-body runs. More precisely, a Fisher analysis reveals that both methods yield marginalized two-dimensional constraints that vary by less than 6% in area, a result that holds under different survey specifications and that matches to within 15% the area obtained from an analytical covariance calculation. Extending this comparison with our 25 wCDM models, we probe the cosmology dependence of the lensing covariance directly from numerical simulations, reproducing remarkably well the Fisher results from the analytical models at most cosmologies. We demonstrate that varying the cosmology at which the covariance matrix is evaluated in the first place might have an order of magnitude greater impact on the parameter constraints than varying the choice of covariance estimation technique. We present a test case in which we generate fast predictions for both the lensing signal and its associated variance with a flexible Gaussian process regression emulator, achieving an accuracy of a few percent on the former and 10% on the latter.

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Section: Introductionmentioning

confidence: 99%

Cosmic shear covariance matrix in wCDM: Cosmology matters

Harnois-Déraps

Giblin

Joachimi

2019

A&A

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“…In addition to these articles, the effect of strong magnetic fields is also studied on the properties of ρ meson [71], B meson [72,73], charmonium [9,16,17,74] and bottomonium states [74,75]. A lot of work has also been done without taking the effect of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pseudoscalar and scalar D mesons and charmonium decay width in hot magnetized asymmetric nuclear matter

Kumar

2020

Phys. Rev. C

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In this article, we calculate the mass shift and decay constant of isospin averaged pseudoscalar (D + ,D 0 ) and scalar (D + 0 ,D 0 0 ) mesons by the magnetic field induced quark and gluon condensates at finite density and temperature of asymmetric nuclear matter. We have calculated the in-medium chiral condensates from the chiral SU(3) mean field model and subsequently used these condensates in QCD Sum Rules (QCDSR) to calculate the effective mass and decay constant of D mesons.Consideration of external magnetic field effects in hot and dense nuclear matter lead to appreciable modification in the masses and decay constants of D mesons. Furthermore, we also studied the effective decay width of higher charmonium states (ψ(3686), ψ(3770), χ c 0 (3414), χ c 2 (3556)) as a by-product by using 3 P 0 model which can have an important impact on the yield of J/ψ mesons.The results of present work will be helpful to understand the experimental observables of the heavy ion colliders which aim to produce matter at finite density and moderate temperature.

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“…Indeed, WL peak counts are sensitive to changes of shape of the mass function. In the literature, it has been shown that peak counts alone constrain cosmology more strictly than two-point-correlation functions and the combination of both statistics improves the constraints (Dietrich & Hartlap 2010;Liu, J. et al 2015a). Applications to observational data are also multiple.…”

Section: Introductionmentioning

confidence: 99%

Quantifying systematics from the shear inversion on weak-lensing peak counts

Lin

Kilbinger

2018

A&A

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Weak-lensing peak counts provide a straightforward way to constrain cosmology by linking local maxima of the lensing signal to the mass function. Recent applications to data have already been numerous and fruitful. However, the importance of understanding and dealing with systematics increases as data quality reaches an unprecedented level. One of the sources of systematics is the convergence-shear inversion. This effect, inevitable when carrying out a convergence field from observations, is usually neglected by theoretical peak models. Thus, it could have an impact on cosmological results. In this paper, we study the bias from neglecting (mis-modeling) the inversion. Our tests show a small but non-negligible bias. The cosmological dependence of this bias seems to be related to the parameter Σ 8 ≡ (Ω m /(1 − α)) 1−α (σ 8 /α) α , where α = 2/3. When this bias propagates to the parameter estimation, we discovered that constraint contours involving the dark energy equation of state can differ by 2σ. Such an effect can be even larger for future high-precision surveys and we argue that the inversion should be properly modeled for theoretical peak models.

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Probing Wilson loops in AdS/QCD

Cited by 14 publications

References 31 publications

Cosmic shear covariance matrix in wCDM: Cosmology matters

Cosmic shear covariance matrix in wCDM: Cosmology matters

Analysis of pseudoscalar and scalar D mesons and charmonium decay width in hot magnetized asymmetric nuclear matter

Quantifying systematics from the shear inversion on weak-lensing peak counts

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