Constraining cosmology with weak lensing voids
Abstract
Upcoming surveys such as LSST and EUCLID will significantly improve the power of weak lensing as a cosmological probe. To maximize the information that can be extracted from these surveys, it is important to explore novel statistics that complement standard weak lensing statistics such as the shearshear correlation function and peak counts. In this work, we use a recently proposed weak lensing observable  weak lensing voids  to make parameter constraint forecasts for an $\small {\rm LSST}$like survey. We use the cosmoSLICS wCDM simulation suite to measure void statistics as a function of cosmological parameters. The simulation data is used to train a Gaussian process regression emulator that we use to generate likelihood contours and provide parameter constraints from mock observations. We find that the void abundance is more constraining than the tangential shear profiles, though the combination of the two gives additional constraining power. We forecast that without tomographic decomposition, these void statistics can constrain the matter fluctuation amplitude, S_{8}, within 0.3 per cent (68 per cent confidence interval), while offering 1.5, 1.5, and 2.7 per cent precision on the matter density parameter, Ω_{m}, the reduced Hubble constant, h, and the dark energy equation of state parameter, w_{0}, respectively. These results are tighter than the constraints from the shearshear correlation function with the same observational specifications for Ω_{m}, S_{8}, and w_{0}. The constraints from the weak lensing voids also have complementary parameter degeneracy directions to the shear 2PCF for all combinations of parameters that include h, making weak lensing void statistics a promising cosmological probe.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 October 2021
 DOI:
 10.1093/mnras/stab2251
 arXiv:
 arXiv:2010.11954
 Bibcode:
 2021MNRAS.507.2267D
 Keywords:

 gravitational lensing: weak;
 methods: data analysis;
 largescale structure of Universe;
 cosmology: theory;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 12 pages, 8 figures, accepted by MNRAS