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Cosmic velocity, density and halo mass function: Insights from deep learning by Etezad-Razavi, Saba; Abbasgholinejad, Erfan; Sotoudeh, Mohammad-Hadi; Hassani, Farbod; Raeisi, Sadegh; Baghram, Shant is a scholarly article available to read on EtoBox.

What is Cosmic velocity, density and halo mass function: Insights from deep learning about?

We discuss an implementation of a deep learning framework to gain insight into dark matter (DM) structure formation. We investigate the contribution of velocity and density field information to the construction of the halo mass function (HMF) in cosmological N-body simulations. We train a Convolutional Neural Network (CNN) on the initial snapshot of a DM-only simulation to predict the halo mass that individual particles fall into at $z = 0$, in the halo mass range of $10.5 < \log (M/M_{\odot}) < 14$. We show that for the standard $\Lambda$CDM cosmology with amplitude of initial perturbations $A_s = 2 \times 10^{-9}$, the initial velocity and density fields have equivalent information, as expected in the linear regime, and manifest the power of our CNN to diagnose the redundant information. To investigate the non-linear effects, we increase the initial power spectrum. In the linear regime, this is equivalent to decreasing the initial redshift. The CNN model trained on the simulation snapshots with large $A_s$ shows a considerable improvement in the HMF prediction when adding the velocity field information. Using our CNN map without further physical assumptions, we precisely evaluate

Author

Etezad-Razavi, Saba; Abbasgholinejad, Erfan; Sotoudeh, Mohammad-Hadi; Hassani, Farbod; Raeisi, Sadegh; Baghram, Shant

Published

2021

Language

EN