Neutrinos in non-linear structure formation — a simple SPH approach
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Neutrinos in non-linear structure formation — a simple SPH approach. / Hannestad, Steen; Haugbølle, Troels; Schultz, Christian.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2, 045, 02.2012.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Neutrinos in non-linear structure formation — a simple SPH approach
AU - Hannestad, Steen
AU - Haugbølle, Troels
AU - Schultz, Christian
PY - 2012/2
Y1 - 2012/2
N2 - We present a novel method for implementing massive neutrinos in N-body simulations. Instead of sampling the neutrino velocity distribution by individual point particles we take neutrino free-streaming into account by treating it as an effective redshift dependent sound speed in a perfect isothermal fluid, and assume a relation between the sound speed and velocity dispersion of the neutrinos. Although the method fails to accurately model the true neutrino power spectrum, it is able to calculate the total matter power spectrum to the same accuracy as more complex hybrid neutrino methods, except on very small scales. We also present an easy way to update the publicly available GADGET-2 version with this neutrino approximation.
AB - We present a novel method for implementing massive neutrinos in N-body simulations. Instead of sampling the neutrino velocity distribution by individual point particles we take neutrino free-streaming into account by treating it as an effective redshift dependent sound speed in a perfect isothermal fluid, and assume a relation between the sound speed and velocity dispersion of the neutrinos. Although the method fails to accurately model the true neutrino power spectrum, it is able to calculate the total matter power spectrum to the same accuracy as more complex hybrid neutrino methods, except on very small scales. We also present an easy way to update the publicly available GADGET-2 version with this neutrino approximation.
U2 - 10.1088/1475-7516/2012/02/045
DO - 10.1088/1475-7516/2012/02/045
M3 - Journal article
VL - 2
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
M1 - 045
ER -
ID: 42037110