The effect of early radiation in N-body simulations of cosmic structure formation
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The effect of early radiation in N-body simulations of cosmic structure formation. / Adamek, Julian; Brandbyge, Jacob; Fidler, Christian; Hannestad, Steen; Rampf, Cornelius; Tram, Thomas.
I: Monthly Notices of the Royal Astronomical Society, Bind 470, Nr. 1, stx1157, 09.2017, s. 303-313.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The effect of early radiation in N-body simulations of cosmic structure formation
AU - Adamek, Julian
AU - Brandbyge, Jacob
AU - Fidler, Christian
AU - Hannestad, Steen
AU - Rampf, Cornelius
AU - Tram, Thomas
PY - 2017/9
Y1 - 2017/9
N2 - Newtonian N-body simulations have been employed successfully over the past decades for the simulation of the cosmological large-scale structure. Such simulations usually ignore radiation perturbations (photons and massless neutrinos) and the impact of general relativity (GR) beyond the background expansion. This approximation can be relaxed and we discuss three different approaches that are accurate to leading order in GR. For simulations that start at redshift less than about 100, we find that the presence of early radiation typically leads to per cent-level effects on the numerical power spectra at large scales. Our numerical results agree across the three methods, and we conclude that all of the three methods are suitable for simulations in a standard cosmology. Two of the methods modify the N-body evolution directly, while the third method can be applied as a post-processing prescription.
AB - Newtonian N-body simulations have been employed successfully over the past decades for the simulation of the cosmological large-scale structure. Such simulations usually ignore radiation perturbations (photons and massless neutrinos) and the impact of general relativity (GR) beyond the background expansion. This approximation can be relaxed and we discuss three different approaches that are accurate to leading order in GR. For simulations that start at redshift less than about 100, we find that the presence of early radiation typically leads to per cent-level effects on the numerical power spectra at large scales. Our numerical results agree across the three methods, and we conclude that all of the three methods are suitable for simulations in a standard cosmology. Two of the methods modify the N-body evolution directly, while the third method can be applied as a post-processing prescription.
KW - Cosmology: theory
KW - Dark matter
KW - Large-scale structure of Universe
UR - http://www.scopus.com/inward/record.url?scp=85021782933&partnerID=8YFLogxK
U2 - 10.1093/mnras/stx1157
DO - 10.1093/mnras/stx1157
M3 - Journal article
AN - SCOPUS:85021782933
VL - 470
SP - 303
EP - 313
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
M1 - stx1157
ER -
ID: 181385876