The effect of thermal neutrino motion on the non-linear cosmological matter power spectrum

By Jacob Brandbyge, S. Hannestad, T. Haugbølle, B. Thomsen. 2008

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We have performed detailed studies of non-linear structure formation in cosmological models with light neutrinos. For the first time the effect of neutrino thermal velocities has been included in a consistent way, and the effect on the matter power spectrum is found to be significant. The effect is large enough to be measured in future, high precision surveys. Additionally, we provide a simple but accurate analytic expression for the suppression of fluctuation power due to massive neutrinos. Finally, we describe a simple and fast method for including the effect of massive neutrinos in large-scale N-body simulations which is accurate at the 1% level for .

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e784f4e6daf5f2adddecc80d2835f186e2f6923f

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Citations in the corpus

An efficient implementation of massive neutrinos in non-linear structure formation simulations (2012, methodology): “This approach was recently taken by Brandbyge et al. (2008), Viel et al. (2010) and Bird et al. (2012) (see also references therein for earlier works).”
Massive neutrinos and the non‐linear matter power spectrum (2011, methodology): “Fortunately, the quality of the numerical simulations has advanced to the point where it is possible to model the impact of neutrinos to the level of a few percent, despite the difficulties presented by the large thermal dispersion of light neutrinos (Brandbyge et al. 2008; Viel et al. 2010).”
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2010, unknown): “…of massive neutrinos in the non-linear structure formation using cosmological perturbation theory (Saito et al. 2008, 2009; Wong 2008; Lesgourgues et al. 2009; Shoji & Komatsu 2009) and numerical simulations (Brandbyge et al. 2008; Brandbyge & Hannestad 2009) have just begun to be explored.”
Quantifying the effect of baryon physics on weak lensing tomography (2011, result): “Although the highly non-linear regime has not been studied, the numerical simulations presented in Brandbyge et al. (2008) suggest that our results are sufficiently accurate:Pν(k)/PCDM(k) reaches a mini- mum value of∼ (1−10fν ) and slightly increases again for smaller k.”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, methodology): “The description of nonlinearities in the matter power spectrum in the presence of massive neutrinos has been addressed in several different ways: [1255, 1028, 1027, 1029] have used perturbation theory, [737] the time-RG flow approach and [228, 227, 229, 1207] different schemes of N -body simulations”
The effect of neutrinos on the matter distribution as probed by the intergalactic medium (2010, methodology): “[22, 23], who found an overall agreement at the percent level at z = 0 between simulations with different initial redshifts.”
Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces (2016, background): “The final, and potentially most accurate, option is to include the neutrinos as a separate particle species in the simulation (e.g., Brandbyge et al. 2008; Viel et al. 2010), thus capturing all aspects of their non-linear evolution and the back-reaction of this on the CDM.”
Neutrino Mass in Cosmology: Status and Prospects (2011, methodology): “Figure 3 shows the large-scale matter power spectrum for several massive neutrino cosmologies from the simulations of reference [57], including the aforementioned neutrino thermal velocity dispersion (see also reference [58]).”
Dark matter halo merger histories beyond cold dark matter – I. Methods and application to warm dark matter (2012, background): “However, it is understood how to include velocity dispersions in WDM simulations (Brandbyge et al. 2008), and this should be included in future simulations.”
Cosmology with massive neutrinos I: towards a realistic modeling of the relation between matter, haloes and galaxies (2013, methodology): “For further details about this method we refer the reader to [30, 35, 37].”