Multi-scale initial conditions for cosmological simulations
Oliver Hahn,Tom Abel,Tom Abel +2 more
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TLDR
In this paper, an adaptive convolution of Gaussian white noise with a real-space transfer function kernel together with an adaptive multi-grid Poisson solver is used to generate displacements and velocities following first- or second-order Lagrangian perturbation theory (2LPT).Abstract:
We discuss a new algorithm to generate multi-scale initial conditions with multiple levels of refinements for cosmological 'zoom-in' simulations. The method uses an adaptive convolution of Gaussian white noise with a real-space transfer function kernel together with an adaptive multi-grid Poisson solver to generate displacements and velocities following first- (1LPT) or second-order Lagrangian perturbation theory (2LPT). The new algorithm achieves rms relative errors of the order of 10{sup -4} for displacements and velocities in the refinement region and thus improves in terms of errors by about two orders of magnitude over previous approaches. In addition, errors are localized at coarse-fine boundaries and do not suffer from Fourier-space-induced interference ringing. An optional hybrid multi-grid and Fast Fourier Transform (FFT) based scheme is introduced which has identical Fourier-space behaviour as traditional approaches. Using a suite of re-simulations of a galaxy cluster halo our real-space-based approach is found to reproduce correlation functions, density profiles, key halo properties and subhalo abundances with per cent level accuracy. Finally, we generalize our approach for two-component baryon and dark-matter simulations and demonstrate that the power spectrum evolution is in excellent agreement with linear perturbation theory. For initial baryon density fields, it is suggested to use the local Lagrangian approximation in order to generate a density field for mesh-based codes that is consistent with the Lagrangian perturbation theory instead of the current practice of using the Eulerian linearly scaled densities.read more
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Galaxies on FIRE (Feedback In Realistic Environments): stellar feedback explains cosmologically inefficient star formation
Philip F. Hopkins,Philip F. Hopkins,Dušan Kereš,Jose Oñorbe,Claude André Faucher-Giguère,Claude André Faucher-Giguère,Eliot Quataert,Norman Murray,James S. Bullock +8 more
TL;DR: In this paper, the authors present a series of high-resolution cosmological simulations of galaxy formation to z = 0, spanning halo masses ∼ 10.8−10.13−M⊙, and stellar masses ∼10.4−10^(11)
Journal ArticleDOI
Physical Models of Galaxy Formation in a Cosmological Framework
Rachel S. Somerville,Romeel Davé +1 more
TL;DR: The current status of models that employ two leading techniques to simulate the physics of galaxy formation: semianalytic models and numerical hydrodynamic simulations is reviewed in this paper, where the authors focus on a set of observational targets that describe the evolution of the global and structural properties of galaxies from roughly cosmic high noon (z ∼ 2 − 3) to the present.
Journal ArticleDOI
FIRE-2 simulations: physics versus numerics in galaxy formation
Philip F. Hopkins,Andrew Wetzel,Andrew Wetzel,Andrew Wetzel,Dušan Kereš,Claude André Faucher-Giguère,Eliot Quataert,Michael Boylan-Kolchin,Norman Murray,Christopher C. Hayward,Shea Garrison-Kimmel,Cameron Hummels,Robert Feldmann,Robert Feldmann,Paul Torrey,Xiangcheng Ma,Daniel Anglés-Alcázar,Kung-Yi Su,Matthew E. Orr,Denise Schmitz,Ivanna Escala,Robyn E. Sanderson,Michael Y. Grudić,Zachary Hafen,Ji-hoon Kim,Alex Fitts,James S. Bullock,Coral Wheeler,T. K. Chan,Oliver D. Elbert,Desika Narayanan +30 more
TL;DR: The Feedback In Realistic Environments (FIRE) project explores feedback in cosmological galaxy formation simulations as mentioned in this paper, which has been used to explore new physics (e.g. magnetic fields).
Journal ArticleDOI
Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
Miguel Rocha,Annika H. G. Peter,James S. Bullock,Manoj Kaplinghat,Shea Garrison-Kimmel,Jose Oñorbe,Leonidas A. Moustakas +6 more
TL;DR: In this article, the effects of self-interacting dark matter (SIDM) on the density profiles and substructure counts of dark matte r halos from the scales of spiral galaxies to galaxy clusters are studied.
Journal ArticleDOI
Physical Models of Galaxy Formation in a Cosmological Framework
Rachel S. Somerville,Romeel Davé +1 more
TL;DR: In this article, the authors review the current status of models that employ semi-analytic models and numerical hydrodynamic simulations to simulate the physics of galaxy formation and show remarkable convergence between different methods and make predictions that are in qualitative agreement with observations.
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