Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/11/039
Keywords
cosmological parameters from LSS; cosmological perturbation theory; power spectrum
Funding
- European Research Council under the European Union's Seventh Framework Programme
- ERC [308082]
- U.K. Science and Technology Facilities Council [ST/M503836/1]
- Science and Technology Facilities Council [1501622] Funding Source: researchfish
- European Research Council (ERC) [308082] Funding Source: European Research Council (ERC)
- STFC [ST/M503836/1] Funding Source: UKRI
Ask authors/readers for more resources
The use of Eulerian 'standard perturbation theory' to describe mass assembly in the early universe has traditionally been limited to modes with k less than or similar to 0.1 h/Mpc at z = 0. At larger k the SPT power spectrum deviates from measurements made using N-body simulations. Recently, there has been progress in extending the reach of perturbation theory to larger k using ideas borrowed from effective field theory. We revisit the computation of the redshift-space matter power spectrum within this framework, including for the first time the full one-loop time dependence. We use a resummation scheme proposed by Vlah et al. to account for damping of baryonic acoustic oscillations due to large-scale random motions and show that this has a significant effect on the multipole power spectra. We renormalize by comparison to a suite of custom N-body simulations matching the MultiDark MDR1 cosmology. At z = 0 and for scales k less than or similar to 0.4 h/Mpc we find that the EFT furnishes a description of the real-space power spectrum up to similar to 2%, for the l = 0 mode up to similar to 5%, and for the l = 2; 4 modes up to similar to 25%. We argue that, in the MDR1 cosmology, positivity of the l = 0 mode gives a firm upper limit of k approximate to 0.74 h/Mpc for the validity of the one-loop EFT prediction in redshift space using only the lowest-order counterterm. We show that replacing the one-loop growth factors by their Einstein-de Sitter counterparts is a good approximation for the l = 0 mode, but can induce deviations as large as 2% for the l = 2; 4 modes. An accompanying software bundle, distributed under open source licenses, includes Mathematica notebooks describing the calculation, together with parallel pipelines capable of computing both the necessary one-loop SPT integrals and the effective field theory counterterms.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available