Cosmology with the kinetic Sunyaev-Zeldovich effect: Independent of the optical depth and $\sigma_8$

Understand

The cosmological constraints from the kinetic Sunyaev-Zeldovich experiments are degenerate with the optical depth measurement, which is commonly known as the optical-depth degeneracy.

• In this work, we introduce a new statistic based on the first moment of relative velocity between pairs in a triplet, which is capable of constraining cosmological parameters independent of the optical depth, and $\sigma_8$.
• Using 22,000 $N$-body simulations from the Quijote suite, we quantify the information content in the new statistic using Fisher matrix forecast.
• We find that it is able to obtain strong constraints on the cosmological parameters, particularly on the summed neutrino mass.