Constraining Neutrino Mass with the Tomographic Weak Lensing Bispectrum

Understand

We explore the effect of massive neutrinos on the weak lensing shear bispectrum using the Cosmological Massive Neutrino Simulations.

• We find that the primary effect of massive neutrinos is to suppress the amplitude of the bispectrum with limited effect on the bispectrum shape.
• The suppression of the bispectrum amplitude is a factor of two greater than the suppression of the small scale power-spectrum.
• For an LSST-like weak lensing survey that observes half of the sky with five tomographic redshift bins, we explore the constraining power of the bispectrum on three cosmological parameters: the sum of the neutrino mass $\sum m_\nu$, the matter density $\Omega_m$ and the amplitude of primordial fluctuations $A_s$.