# Constraints on the dark matter and dark energy interactions from weak lensing bispectrum tomography

## TL;DR

This paper investigates how weak lensing bispectrum tomography can constrain interactions between dark matter and dark energy, forecasting parameter uncertainties and potential bounds using upcoming survey data.

## Contribution

It introduces a Fisher matrix analysis of weak lensing bispectrum tomography to constrain dark sector interactions, providing forecasts for future survey capabilities.

## Key findings

- Forecasts upper bounds on dark sector interaction strength.
- Demonstrates bispectrum tomography improves constraints over power spectrum alone.
- Highlights potential of upcoming surveys to tighten dark energy and dark matter interaction limits.

## Abstract

We estimate uncertainties of cosmological parameters for phenomenological interacting dark energy models using weak lensing convergence power spectrum and bispectrum. We focus on the bispectrum tomography and examine how well the weak lensing bispectrum with tomography can constrain the interactions between dark sectors, as well as other cosmological parameters. Employing the Fisher matrix analysis, we forecast parameter uncertainties derived from weak lensing bispectra with a two-bin tomography and place upper bounds on strength of the interactions between the dark sectors. The cosmic shear will be measured from upcoming weak lensing surveys with high sensitivity, thus it enables us to use the higher order correlation functions of weak lensing to constrain the interaction between dark sectors and will potentially provide more stringent results with other observations combined.