Gravitational hydrodynamics of large scale structure formation

TL;DR

This paper proposes a top-down gravitational hydrodynamics model for large-scale structure formation, emphasizing turbulence and void creation in the primordial plasma, challenging the standard cold dark matter paradigm.

Contribution

It introduces a novel top-down fragmentation scenario driven by turbulence and viscosity, explaining structure formation and dark matter composition without relying on cold dark matter.

Findings

Void sizes expand to 37 Mpc on average

Galaxies and star clusters form from turbulence-induced fragmentation

Dark matter halos consist of earth-mass H-He planets

Abstract

The gravitational hydrodynamics of the primordial plasma with neutrino hot dark matter is considered as a challenge to the bottom-up cold dark matter 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. Frozen planets are observed in microlensing and white-dwarf-heated ones in planetary nebulae. The approach also explains the Tully-Fisher and Faber-Jackson relations, and cosmic microwave temperature fluctuations of micro-Kelvins.