Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 492, Issue 4, Pages 5754-5763Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa251
Keywords
galaxies: haloes; galaxies: statistics; cosmological parameters; cosmology: theory; large-scale structure of the Universe
Categories
Funding
- National Science Foundation (NSF) Graduate Research Fellowship [DGE 1106400]
- UC Berkeley Theoretical Astrophysics Center Astronomy and Astrophysics Graduate Fellowship
- U.S. Department of Energy
- National Science Foundation [1713791]
- National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien [1713791] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1713791] Funding Source: National Science Foundation
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We investigate the range of applicability of a model for the real-space power spectrum based on N-body dynamics and a (quadratic) Lagrangian bias expansion. This combination uses the highly accurate particle displacements that can be efficiently achieved by modern N-body methods with a symmetries-based bias expansion which describes the clustering of any tracer on large scales. We show that at low redshifts, and for moderately biased tracers, the substitution of N-body-determined dynamics improves over an equivalent model using perturbation theory by more than a factor of two in scale, while at high redshifts and for highly biased tracers the gains are more modest. This hybrid approach lends itself well to emulation. By removing the need to identify haloes and subhaloes, and by not requiring any galaxy-formation-related parameters to be included, the emulation task is significantly simplified at the cost of modelling a more limited range in scale.
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