Can neutrino decay-driven mock gravity save hot dark matter?

Statistics – Computation

Scientific paper

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Dark Matter, Decay, Dwarf Galaxies, Gravitational Collapse, Neutrinos, Astronomical Models, Computational Astrophysics, Interstellar Matter, Opacity, Recombination Reactions

Scientific paper

The radiative decay of a 30 eV neutrino with a lifetime of order 10 exp 23-24 s has recently been shown to yield a satisfactory explanation of a wide range of problems in astrophysics. In this paper, it is investigated whether the photon flux generated by the radiative decay of a massive neutrino is capable of generating sufficient radiation pressure to cause a 'mock gravitational' collapse of primordial hydrogen clouds. It is shown that when using neutral hydrogen as a source of opacity for mock gravity the time scale for mock gravitational collapse is significantly larger than the expansion time scale. Thus, the model fails as a source of galactic seed perturbations. Furthermore, it is argued that nonlinear feedback mechanisms will be unable to increase the collapse rate of the cloud under mock gravity.

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