Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 503, Issue 1, Pages 406-425Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3605
Keywords
dark matter; large-scale structure of Universe; cosmology: theory
Categories
Funding
- European Union [795707]
- European Research Council under the European Union [679145]
- European Research Council (ERC) [679145] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [795707] Funding Source: Marie Curie Actions (MSCA)
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The passage discusses the perturbation theory for two gravitationally coupled fluids in a Lambda CDM Universe, deriving explicit recursion relations for fluid densities, all-order results in Lagrangian-coordinates approach, and component wavefunctions in a semiclassical approach to cosmic large-scale structure. These theoretical results are then applied to generate novel higher order initial conditions for cosmological hydrodynamical simulations in a companion paper.
The cosmic large-scale structure of our Universe is comprised of baryons and cold dark matter (CDM). Yet it is customary to treat these two components as a combined single-matter fluid with vanishing pressure, which is justified only for sufficiently large scales and late times. Here, we go beyond the single-fluid approximation and develop the perturbation theory for two gravitationally coupled fluids while still assuming vanishing pressure. We mostly focus on perturbative expansions in powers of D (or D+), the linear structure growth of matter in a Lambda CDM Universe with cosmological constant Lambda. We derive in particular (1) explicit recursion relations for the two fluid densities, (2) complementary all-order results in the Lagrangian-coordinates approach, as well as (3) the associated component wavefunctions in a semiclassical approach to cosmic large-scale structure. In our companion paper, we apply these new theoretical results to generate novel higher order initial conditions for cosmological hydrodynamical simulations.
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