1605.07548
Constraining the halo mass function with observations
Castro, Marra, Quartin
Ask how well observations can constrain directly the HMF. The observables considered are galaxy cluster number counts, galaxy closer PS and lensing of type Ia supernovae. Results show that DES is capable of putting the first meaningful constraints, while both Euclid and J-PAS can give constraints on the HMF parameters which are comparable to the ones from state-of-the-art simulations. Also find that an independent measurement of cluster masses is even more important for measuring the HMF than for constraining the cosmological parameters, and can vastly improve the determination of the halo mass function. Measuring the HMF could thus be used to cross-check simulations and their implementation of baryon physics. It could even, if deviations cannot be accounted for, hint at new physics.
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