MG12 - Talk detail
 

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Abstract

Do non-relativistic neutrinos constitute the dark matter?

The dark matter of the Abell 1689 cluster is modeled by thermal fermions and its galaxies and X-ray gas by isothermal distributions. A fit yields a mass of $h_{70}^{1/2}(12/g)^{1/4}$1.445 eV. A dark matter fraction $h_{70}^{-3/2}0.1893$$ occurs for $g=12$ degrees of freedom, i. e., 6 active and 6 sterile neutrinos with masses $\approx 2^{3/4}G_F^{1/2}m_e^2$. Given a temperature of 0.045 K and a de Broglie length of 0.20 mm, they establish a quantum structure of several million light years across, the largest known in the Universe. The virial $\alpha$-particle temperature of $9.9\pm1.1$ keV$/k_B$ coincides with the one of X-rays. The results are compatible with neutrino genesis, nucleosynthesis and free streaming. The neutrinos condense on the cluster at $z\sim 28$, thereby reionizing the intracluster gas without heavy stars. The baryons are poor tracers of the dark matter density.

Gravitational hydrodynamics of large scale structure formation

The gravitational hydrodynamics of the primordial plasma with neutrino hot dark matter is considered as a challenge to the bottom-up CDM paradigm. Viscosity and turbulence induce a top-down fragmentation scenario before and at decoupling. The first step is the creation of voids in the plasma, which expand to $37$ Mpc on the average now. The remaining matter clumps turn into galaxy clusters. Turbulence produced at expanding void boundaries causes a linear morphology of 3 kpc fragmenting protogalaxies along vortex lines. At decoupling galaxies and proto-globular star clusters arise; the latter constitute the galactic dark matter halos and consist themselves of earth-mass H-He planets. These planets are observed in microlensing and in planetary nebulae when heated by a white dwarf. The approach also explains the Tully-Fisher and Faber-Jackson relations, and CMB temperature fluctuations of micro-Kelvins.

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