Topic
Mixed dark matter
About: Mixed dark matter is a research topic. Over the lifetime, 2027 publications have been published within this topic receiving 58899 citations.
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TL;DR: Astronomical observations may enable us to study dark matter properties that are inaccessible in the laboratory if the cold dark matter particles are self-interacting with a large scattering cross section but negligible annihilation or dissipation.
Abstract: Cosmological models with cold dark matter composed of weakly interacting particles predict overly dense cores in the centers of galaxies and clusters and an overly large number of halos within the Local Group compared to actual observations. We propose that the conflict can be resolved if the cold dark matter particles are self-interacting with a large scattering cross section but negligible annihilation or dissipation. In this scenario, astronomical observations may enable us to study dark matter properties that are inaccessible in the laboratory.
1,800 citations
TL;DR: These problems might be solved, and the virtues of CDM models retained, even without postulating ad hoc dark matter particle or field interactions, if the dark matter is composed of ultralight scalar particles initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models.
Abstract: Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating ad hoc dark matter particle or field interactions, if the dark matter is composed of ultralight scalar particles (m approximately 10(-22) eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse, providing halo cores and sharply suppressing small-scale linear power.
1,413 citations
TL;DR: In this article, the authors extend the world model of Kamenshchik et al. to large perturbations by formulating a Zeldovich-like approximation, and sketch how this model unifies dark matter with dark energy in a geometric setting reminiscent of M-theory.
944 citations
TL;DR: In this paper, the authors present an accurate formula that describes the matter transfer functions of all common variants of the adiabatic cold dark matter model, including mixed dark matter models.
Abstract: The bulk of recent cosmological research has focused on the adiabatic cold dark matter model and its simple extensions. Here we present an accurate —tting formula that describes the matter transfer func- tions of all common variants, including mixed dark matter models. The result is a function of wavenum- ber, time, and six cosmological parameters: the massive neutrino density, number of neutrino species degenerate in mass, baryon density, Hubble constant, cosmological constant, and spatial curvature. We show how observational constraintse.g., the shape of the power spectrum, the abundance of clusters and damped Lya systems, and the properties of the Lya forestcan be extended to a wide range of cosmologies, which includes variations in the neutrino and baryon fractions in both high-density and low-density universes. Subject headings: cosmology: theorydark matterlarge-scale structure of universe
938 citations
TL;DR: The possibility that the dark matter comprises primordial black holes (PBHs) is considered in this paper, with particular emphasis on the currently allowed mass windows at 10(16)-10(17) g, 10(20)-10 (24) g and 1-...
Abstract: The possibility that the dark matter comprises primordial black holes (PBHs) is considered, with particular emphasis on the currently allowed mass windows at 10(16)-10(17) g, 10(20)-10(24) g and 1- ...
915 citations