![]() Our framework opens a new window for discovering which physical aspects of the halo's Lagrangian patch determine assembly bias, which in turn can inform physical models of halo formation and bias. The expected secondary assembly bias dependence on halo concentration is also recovered by the CNN: at fixed mass, halo concentration has only a mild impact on $b_1$, but a strong impact on $b_\phi$. We show that the CNN recovers the known trends for the linear and second-order density bias parameters $b_1$ and $b_2$, as well as for the local primordial non-Gaussianity linear bias parameter $b_\phi$. What does halo bias mean Information and translations of halo bias in the most comprehensive dictionary definitions resource on the web. The CNN correctly predicts how the local properties of dark matter halos respond to changes in the large-scale environment, despite no explicit knowledge of halo bias being provided during training. Definition of halo bias in the dictionary. The CNN is then used as a surrogate model to derive the response of the halos' mass and concentration to long-wavelength perturbations in the initial conditions, and consequently the halo bias parameters following the "response bias" definition. We train a convolutional neural network (CNN) to predict the final mass and concentration of dark matter halos from the initial conditions. ![]() Download a PDF of the paper titled Halo assembly bias from a deep learning model of halo formation, by Luisa Lucie-Smith and 1 other authors Download PDF Abstract:We build a deep learning framework that connects the local formation process of dark matter halos to the halo bias.
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