Gravitational hydrodynamics vs observations of voids, Jeans clusters and MACHO dark matter

TL;DR

This paper proposes a gravitational hydrodynamics model explaining cosmic voids, galaxy rotation curves, and dark matter composition through plasma fragmentation, Jeans clusters, and baryonic and neutrino dark matter, aligning with various astronomical observations.

Contribution

It introduces a nonlinear viscous hydrodynamics framework for cosmic structure formation, challenging standard dark matter models and explaining multiple phenomena with baryonic and neutrino dark matter.

Findings

Cosmic voids are explained by plasma fragmentation at early universe.

Jeans clusters of milli brown dwarfs account for galaxy rotation curves.

Observations of milli brown dwarfs support the model's dark matter components.

Abstract

Gravitational hydrodynamics acknowledges that hydrodynamics is essentially nonlinear and viscous. In the plasma, at $z=5100$, the viscous length enters the horizon and causes fragmentation into plasma clumps surrounded by voids. The latter have expanded to 38 Mpc now, explaining the cosmic void scale $30/h=42$ Mpc. After the decoupling the Jeans mechanism fragments all matter in clumps of ca 40,000 solar masses. Each of them fragments due to viscosity in millibrown dwarfs of earth weight, so each Jeans cluster contains billions of them. The Jeans clusters act as ideal gas particles in the isothermal model, explaining the flattening of rotation curves. The first stars in old globular clusters are formed by aggregation of milli brown dwarfs, without dark period. Star formation also happens when Jean clusters come close to each other and agitate and heat up the cooled milli brown dwarfs, which then expand and coalesce to form new stars. This explains the Tully-Fischer and Jackson-Faber relations, and the formation of young globular clusters in galaxy mergers. Thousand of milli brown dwarfs have been observed in quasar microlensing and some 40,000 in the Helix planetary nebula. While the milli brown dwarfs, i.e., dark baryons, constitute the galactic dark matter, cluster dark matter consists probably of 1.5 eV neutrinos, free streaming at the decoupling. These two types of dark matter explain a wealth of observations.