# The accuracy of weak lensing simulations

@article{Hilbert2019TheAO, title={The accuracy of weak lensing simulations}, author={Stefan Hilbert and Alexandre Barreira and Giulio Fabbian and Pablo Fosalba and Carlo Giocoli and Sownak Bose and Matteo Calabrese and Carmelita Carbone and Christopher T. Davies and Baojiu Li and Claudio Llinares and Pierluigi Monaco}, journal={Monthly Notices of the Royal Astronomical Society}, year={2019} }

We investigate the accuracy of weak lensing simulations by comparing the results of five independently developed lensing simulation codes run on the same input N-body simulation. Our comparison focuses on the lensing convergence maps produced by the codes, and in particular on the corresponding PDFs, power spectra, and peak counts. We find that the convergence power spectra of the lensing codes agree to $\lesssim 2{{\ \rm per\ cent}}$ out to scales ℓ ≈ 4000. For lensing peak counts, the…

## 19 Citations

### Testing the reliability of fast methods for weak lensing simulations: wl-moka on pinocchio

- Physics
- 2020

The generation of simulated convergence maps is of key importance in fully exploiting weak lensing by Large Scale Structure (LSS) from which cosmological parameters can be derived. In this paper we…

### Weak-lensing observables in relativistic N-body simulations

- Physics
- 2020

We present a numerical weak-lensing analysis that is fully relativistic and non-perturbative for the scalar part of the gravitational potential and first-order in the vector part, frame dragging.…

### Fast estimation of aperture mass statistics – I. Aperture mass variance and an application to the CFHTLenS data

- MathematicsMonthly Notices of the Royal Astronomical Society
- 2020

This method unlocks the door to efficient methods for recovering higher order aperture mass statistics in linear order operations.

### Estimating the integrated bispectrum from weak lensing maps

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

We use a recently introduced statistic called Integrated Bispectrum (IB) to probe the gravity-induced non-Gaussianity at the level of the bispectrum from weak lensing convergence or κ maps. We…

### Fast lightcones for combined cosmological probes

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2021

The combination of different cosmological probes offers stringent tests of the ΛCDM model and enhanced control of systematics. For this purpose, we present an extension of the lightcone generator…

### Comparison of delensing methodologies and assessment of the delensing capabilities of future experiments

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

Most of the CMB experiments proposed for the next generation aim to detect the Primordial Gravitational Wave Background (PGWB). The fulfillment of this objective depends on our capacity to separate…

### DEMNUni: comparing nonlinear power spectra prescriptions in the presence of massive neutrinos and dynamical dark energy

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2022

We provide an accurate comparison, against large cosmological N-body simulations, of different prescriptions for modelling nonlinear matter power spectra in the presence of massive neutrinos and…

### Solving small-scale clustering problems in approximate light-cone mocks

- PhysicsMonthly Notices of the Royal Astronomical Society
- 2022

Realistic light-cone mocks are important in the clustering analyses of large galaxy surveys. For simulations where only the snapshots are available, it is common to create approximate light-cones…

### Snowmass2021 Computational Frontier White Paper: Cosmological Simulations and Modeling

- Physics
- 2022

Powerful new observational facilities will come online over the next decade, enabling a number of discovery opportunities in the “Cosmic Frontier”, which targets understanding of the physics of the…

## References

SHOWING 1-10 OF 133 REFERENCES

### Numerical study of the statistical properties of the lensing excursion angles

- Physics
- 2001

ABSTRA C T We present ray tracing simulations combined with sets of large N-body simulations. Experiments were performed to explore, for the first time, the statistical properties of fluctuations in…

### Ray-tracing Simulations of Weak Lensing by Large-Scale Structure

- Physics
- 2000

We investigate weak lensing by large-scale structure using ray tracing through N-body simulations. Photon trajectories are followed through high-resolution simulations of structure formation to make…

### Fast weak-lensing simulations with halo model

- Physics
- 2017

Full ray-tracing maps of gravitational lensing, constructed from N-Body simulations, represent a fundamental tool to interpret present and future weak lensing data. However the limitation of…

### CMB weak-lensing beyond the Born approximation: a numerical approach

- Physics
- 2018

We perform a complete study of the gravitational lensing effect beyond the Born approximation on the Cosmic Microwave Background (CMB) anisotropies using a multiple-lens raytracing technique through…

### Impact of post-Born lensing on the CMB

- Physics
- 2016

Lensing of the CMB is affected by post-Born lensing, producing corrections to the convergence power spectrum and introducing field rotation. We show numerically that the lensing convergence power…

### High-precision simulations of the weak lensing effect on cosmic microwave background polarization

- Physics
- 2013

We studied the accuracy, robustness, and self-consistency of pixel-domain simulations of the gravitational lensing effect on the primordial cosmic microwave background (CMB) anisotropies due to the…

### Effect of lensing non-Gaussianity on the CMB power spectra

- Physics
- 2016

Observed CMB anisotropies are lensed, and the lensed power spectra can be calculated accurately assuming the lensing deflections are Gaussian. However, the lensing deflections are actually slightly…

### Multiple lensing of the cosmic microwave background anisotropies

- Physics
- 2014

We study the gravitational lensing effect on the Cosmic Microwave Background (CMB) anisotropies performing a ray-tracing of the primordial CMB photons through intervening large-scale structures (LSS)…

### Gravitational lensing simulations - I. Covariance matrices and halo catalogues

- Physics
- 2012

Gravitational lensing surveys have now become large and precise enough that the interpretation of the lensing signal in current and future surveys has to take into account an increasing number of…

### Validity of the Born approximation for beyond Gaussian weak lensing observables

- Physics
- 2016

Accurate forward modeling of weak lensing (WL) observables from cosmological parameters is necessary for upcoming galaxy surveys. Because WL probes structures in the non-linear regime, analytical…