Search Results for author:
Found 13 papers, 2 papers with code
Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects
In particular, de Santi et al. (2023) developed models that could accurately infer the value of $\Omega_{\rm m}$ from catalogs that only contain the positions and radial velocities of galaxies that are robust to uncertainties in astrophysics and subgrid models.
Robust Field-level Likelihood-free Inference with Galaxies
We train graph neural networks to perform field-level likelihood-free inference using galaxy catalogs from state-of-the-art hydrodynamic simulations of the CAMELS project.
Robust field-level inference with dark matter halos
More importantly, we find that our models are very robust: they can infer the value of $\Omega_{\rm m}$ and $\sigma_8$ when tested using halo catalogues from thousands of N-body simulations run with five different N-body codes: Abacus, CUBEP$^3$M, Enzo, PKDGrav3, and Ramses.
Virgo: Scalable Unsupervised Classification of Cosmological Shock Waves
Cosmological shock waves are essential to understanding the formation of cosmological structures.
Satellite galaxy abundance dependency on cosmology in Magneticum simulations
Conclusions: This work provides a preliminary calibration of the cosmological dependency of the satellite abundance of high mass halos, and we showed that modelling HOD with cosmological parameters is necessary to interpret satellite abundance, and we showed the importance of using FP simulations in modelling this dependency.
A New View of Observed Galaxies through 3D Modelling and Visualisation
Observational astronomers survey the sky in great detail to gain a better understanding of many types of astronomical phenomena.
Instrumentation and Methods for Astrophysics Graphics
High-Energy Neutrino Production in Clusters of Galaxies
For CRs injected with a power-law energy spectrum $\propto E^{-2}$, we find that clusters contribute to the diffuse flux observed by the IceCube Neutrino Observatory with up to $\sim 20 \;\%$.
High Energy Astrophysical Phenomena Astrophysics of Galaxies
Impact of baryons in cosmic shear analyses with tomographic aperture mass statistics
However, baryons need to be accounted for at the percentage level for future Stage IV surveys and we propose to include the uncertainty on the AGN feedback amplitude by marginalizing over this parameter using multiple simulations such as those presented in this paper.
Cosmology and Nongalactic Astrophysics
Cosmic Shear Cosmology Beyond 2-Point Statistics: A Combined Peak Count and Correlation Function Analysis of DES-Y1
With mock DES-Y1 data we calibrate the impact of photometric redshift and shear calibration uncertainty on the peak-count, marginalising over these uncertainties in our cosmological analysis.
Cosmology and Nongalactic Astrophysics
Peculiar Velocity Estimation from Kinetic SZ Effect using Deep Neural Networks
The Sunyaev-Zel'dolvich (SZ) effect is expected to be instrumental in measuring velocities of distant clusters in near future telescope surveys.
Cosmology and Nongalactic Astrophysics
Stellar Property Statistics of Massive Halos from Cosmological Hydrodynamics Simulations: Common Kernel Shapes
The highest resolution simulations find $\gamma \simeq -0. 8$ for the $z=0$ shape of $p(\ln M_{\star,\rm BCG}\,|\, M_{\rm halo}, z)$ and also that the fractional scatter in total stellar mass is below $10\%$ in halos more massive than $10^{14. 3} M_{\odot}$.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
Using X-Ray Morphological Parameters to Strengthen Galaxy Cluster Mass Estimates via Machine Learning
This procedure is performed for two different mock observation series in an effort to bracket the potential enhancement in mass predictions that can be made possible by including dynamical state information.
Cosmology and Nongalactic Astrophysics
Numerical study of halo concentrations in dark-energy cosmologies
We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant and time-variable equation of state, and compare them with "standard'' Lambda-CDM and OCDM models.
