Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/06/002
Keywords
cosmological simulations; intergalactic media; Lyman alpha forest; power spectrum
Funding
- NSF [AST-1817256]
- UCL Cosmoparticle Initiative
- Munich Institute for Astro- and Particle Physics (MIAPP) - Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2094 - 390783311]
- STFC [ST/N003853/1] Funding Source: UKRI
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We revisit techniques for performing cosmological simulations with both baryons and cold dark matter when each fluid has different initial conditions, as is the case at the end of the radiation era. Most simulations do not reproduce the linear prediction for the difference between the cold dark matter and baryon perturbations. We show that this is due to the common use of offset regular grids when setting up the particle initial conditions. The desired linear evolution can be obtained without any loss of simulation resolution by using a Lagrangian glass for the baryon particles. We further show that the difference between cold dark matter and baryons may affect predictions for the Lyman-alpha forest flux power spectrum at the 5% level, potentially impacting current cosmological constraints.
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