MG12 - Talk detail |
Participant |
Nieuwenhuizen, Theo M. | |
Institution |
University of Amsterdam - Valckenierstraat 65 - Amsterdam - - Netherland | |
Session |
Talk |
Abstract |
AP1 |
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. |
BHT1 |
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. |