November 27, 2023 to December 1, 2023
Dual node
Europe/Paris timezone

Neutrino mass constraint from an Implicit Likelihood Analysis of BOSS voids

Nov 28, 2023, 4:38 PM
Dual node

Dual node

IAP (Paris) & CCA/Flatiron (New York) IAP 98bis Boulevard Arago 75014 Paris FRANCE CCA/Flatiron 5th Avenue New York (NY) USA
Fractional talk New York Contributed talks


Leander Thiele (Princeton University)


Cosmic voids identified in the spatial distribution of galaxies provide complementary information to two-point statistics. In particular, constraints on the neutrino mass sum, $\sum m_\nu$, promise to benefit from the inclusion of void statistics. We perform inference on the CMASS NGC sample of SDSS-III/BOSS with the aim of constraining $\sum m_\nu$. We utilize the void size function, the void-galaxy cross power spectrum, and the galaxy auto power spectrum. To extract constraints from these summary statistics we use a simulation-based approach, specifically implicit likelihood inference. We populate approximate gravity-only, particle neutrino cosmological simulations with an expressive halo occupation distribution model. With a conservative scale cut of $k_\text{max}=0.15\,h\text{Mpc}^{-1}$ and a Planck-inspired $\Lambda$CDM prior, we find upper bounds on $\sum m_\nu$ of $0.43$ and $0.35\,\text{eV}$ from the galaxy auto power spectrum and the full data vector, respectively ($95\,\%$ credible interval). We observe hints that the void statistics may be most effective at constraining $\sum m_\nu$ from below. We also substantiate the usual assumption that the void size function is Poisson distributed.

Primary author

Leander Thiele (Princeton University)


Presentation materials