Late Forming Dark Matter in Theories of Neutrino Dark Energy

Details Late Forming Dark Matter in Theories of Neutrino Dark Energy Late Forming Dark Matter in Theories of Neutrino Dark Energy

2006-11-12

arxiv.org/abs/astro-ph/0611353v1

Astronomy and Astrophysics

Astrophysics

14 pages, 2 figures

Scientific paper

We study the possibility of Late Forming Dark Matter (LFDM), where a scalar field, previously trapped in a metastable state by thermal or finite density effects, begins to oscillate near the era matter-radiation equality about its true minimum. Such a theory is motivated generally if the dark energy is of a similar form, but has not yet made the transition to dark matter, and, in particular, arises automatically in recently considered theories of neutrino dark energy. If such a field comprises the present dark matter, the matter power spectrum typically shows a sharp break at small, presently nonlinear scales, below which power is highly suppressed and previously contained acoustic oscillations. If, instead, such a field forms a subdominant component of the total dark matter, such acoustic oscillations may imprint themselves in the linear regime.

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