منابع مشابه
Caustic Rings of Dark Matter
It is shown that the infall of collisionless dark matter onto isolated galaxies produces a series of caustic rings in the halo dark matter distribution. The properties of these caustics are investigated. It is found in particular that the density profile of the caustic behaves as the inverse distance to the ring. Bumps in the rotation curve of NGC 3198 are interpreted as due to caustic rings of...
متن کاملCaustic Rings and Cold Dark Matter
The hierarchical cold dark matter (CDM) model for structure formation is a well defined and testable model. Direct detection is the best technique for confirming the model yet predictions for the energy and density distribution of particles on earth remain inadequate. Axially symmetric collapse of collisionless dark matter can leave observable caustic rings in phase space and this model is freq...
متن کاملar X iv : a st ro - p h / 98 10 28 6 v 1 1 9 O ct 1 99 8 VELOCITY PEAKS AND CAUSTIC RINGS
The late infall of cold dark matter onto an isolated galaxy produces flows with definite local velocity vectors throughout the galactic halo. It also produces caustic rings, which are places in the halo where the dark matter density is very large. The self-similar model of halo formation predicts that the caustic ring radii an follow the approximate law an ≃ 1/n. I interpret bumps in the rotati...
متن کاملDark Matter Axions and Caustic Rings
The last term is a 4-divergence and hence does not contribute in perturbation theory. That term does however contribute through non-perturbative effects [2] associated with QCD instantons [3]. Such effects can make the physics of QCD depend upon the value of θ. Using the Adler-Bell-Jackiw anomaly [4], one can show that θ dependence must be present if none of the current quark masses vanishes. (...
متن کاملVelocity peaks in the cold dark matter spectrum on Earth.
The cold dark matter spectrum on earth is expected to have peaks in velocity space. We obtain estimates for the sizes and locations of these peaks. To this end we have generalized the secondary infall model of galactic halo formation to include angular momentum of the dark matter particles. This new model is still spherically symmetric and it has self-similar solutions. Our results are relevant...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(98)00512-x