3 papers
astro-ph.CO2025
Equilateral non-Gaussian Bias at the Field Level
Divij Sharma, James M. Sullivan, Kazuyuki Akitsu +1
Primordial non-Gaussianity (PNG) is a common prediction of a wide class of inflationary models. Equilateral-type PNG, generically predicted by single-field inflationary models with…
astro-ph.CO2024
A comparative study of cosmological constraints from weak lensing using Convolutional Neural Networks
Divij Sharma, Biwei Dai, Uros Seljak
Weak Lensing (WL) surveys are reaching unprecedented depths, enabling the investigation of very small angular scales. At these scales, nonlinear gravitational effects lead to highe…
astro-ph.CO2024
A field-level emulator for modeling baryonic effects across hydrodynamic simulations
Divij Sharma, Biwei Dai, Francisco Villaescusa-Navarro +1
We develop a new and simple method to model baryonic effects at the field level relevant for weak lensing analyses. We analyze thousands of state-of-the-art hydrodynamic simulation…