How supernova feedback turns dark matter cusps into cores
Andrew Pontzen,Fabio Governato +1 more
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TLDR
In this article, an analytical description of the physical processes associated with the origin of cored dark matter density profiles is proposed and successfully tested against new cosmological simulations. But the model is restricted to the case where only a few per cent of the baryons form stars.Abstract:
We propose and successfully test against new cosmological simulations a novel analytical description of the physical processes associated with the origin of cored dark matter density profiles. In the simulations, the potential in the central kiloparsec changes on sub-dynamical timescales over the redshift interval 4 > z > 2 as repeated, energetic feedback generates large underdense bubbles of expanding gas from centrally-concentrated bursts of star formation. The model demonstrates how fluctuations in the central potential irreversibly transfer energy into collisionless particles, thus generating a dark matter core. A supply of gas undergoing collapse and rapid expansion is therefore the essential ingredient. The framework, based on a novel impulsive approximation, breaks with the reliance on adiabatic approximations which are inappropriate in the rapidly-changing limit. It shows that both outflows and galactic fountains can give rise to cusp-flattening, even when only a few per cent of the baryons form stars. Dwarf galaxies maintain their core to the present time. The model suggests that constant density dark matter cores will be generated in systems of a wide mass range if central starbursts or AGN phases are sufficiently frequent and energetic.read more
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Ultralight scalars as cosmological dark matter
TL;DR: Fuzzy dark matter (FDM) as discussed by the authorsDM is an alternative to CDM, which is an extremely light boson having a de Broglie wavelength inside the galaxy.
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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)
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A facility to search for hidden particles at the CERN SPS: the SHiP physics case.
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Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
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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.
References
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