Dark matter phase space densities
نویسندگان
چکیده
منابع مشابه
Singlet scalar dark matter in noncommutative space
In this paper, we examine the singlet scalar dark matter annihilation to becoming the Standard Model particles in the non-commutative space. In the recent decades, many candidates of dark matter have been offered, but our information about the nature of dark matter is still limited. There are such particle candidates as scalar matetr, fermion, boson, gauge boson, etc.; however, they have nei...
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Context. In a Universe dominated by dark matter, halos are continuously accreting mass (violently or not) and such mechanism affects their dynamical state. Aims. The evolution of dark matter halos in phase-space, and using the phase-space density indicator Q = ρ/σ as a tracer, is discussed. Methods. We have performed cosmological N-body simulations from which we have carried a detailed study of...
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We explore observed dynamical trends in a wide range of dark-matter-dominated systems (about seven orders of magnitude in mass) to constrain hypothetical dark matter candidates and scenarios of structure formation. First, we argue that neither generic warm dark matter (collisionless or collisional) nor self-interacting dark matter can be responsible for the observed cores on all scales. Both sc...
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Current data suggest that the central mass densities ρ0 and phase-space densities Q ≡ ρ0/σ 3 V of cosmological halos in the present universe are correlated with their velocity dispersions σV over a very wide range of σV from less than 10 to more than 1000 km s. Such correlations are an expected consequence of the statistical correlation of the formation epochs of virialized objects in the CDM m...
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Using an analytic model calibrated against numerical simulations, we calculate the central densities of dark matter halos in a “conventional” cold dark matter model with a cosmological constant (LCDM) and in a “tilted” model (TLCDM) with slightly modified parameters motivated by recent analyses of Lyα forest data. We also calculate how warm dark matter (WDM) would modify these predicted densiti...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2001
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.64.027301