An Isocurvature Mechanism for Structure Formation

Details An Isocurvature Mechanism for Structure Formation An Isocurvature Mechanism for Structure Formation

1998-09-11

arxiv.org/abs/astro-ph/9809142v1

Phys.Rev.D59:021301,1999

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, submitted to PRD (rapid communications)

Scientific paper

10.1103/PhysRevD.59.021301

We examine a novel mechanism for structure formation involving initial number density fluctuations between relativistic species, one of which then undergoes a temporary downward variation in its equation of state and generates superhorizon-scale density fluctuations. Isocurvature decaying dark matter models (iDDM) provide concrete examples. This mechanism solves the phenomenological problems of traditional isocurvature models, allowing iDDM models to fit the current CMB and large-scale structure data, while still providing novel behavior. We characterize the decaying dark matter and its decay products as a single component of ``generalized dark matter''. This simplifies calculations in decaying dark matter models and others that utilize this mechanism for structure formation.

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