Self-similar spherical collapse with tidal torque

Zukin, Phillip; Bertschinger, Edmund

doi:10.1103/physrevd.82.104044

Cited by 32 publications

(30 citation statements)

References 46 publications

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“…The addition of angular momentum increases the range of slopes allowed, predicting a pure power law that scales as r −1.3 for Milky Way-mass halos (Nusser, 2001). When torques are introduced into the spherical infall model, the central slope is mass dependent, with larger mass halos being described by steeper density profiles (Zukin and Bertschinger, 2010). It is also interesting to note that even in the simplest case of pure radial orbits, numerical simulations with spherical initial conditions show that the radial orbit instability turns the resulting halo into a non-spherical structure (Vogelsberger et al, 2011).…”

Section: Mass Distributionmentioning

confidence: 99%

Galactic searches for dark matter

2013

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For nearly a century, more mass has been measured in galaxies than is contained in the luminous stars and gas. Through continual advances in observations and theory, it has become clear that the dark matter in galaxies is not comprised of known astronomical objects or baryonic matter, and that identification of it is certain to reveal a profound connection between astrophysics, cosmology, and fundamental physics. The best explanation for dark matter is that it is in the form of a yet undiscovered particle of nature, with experiments now gaining sensitivity to the most well-motivated particle dark matter candidates. In this article, I review measurements of dark matter in the Milky Way and its satellite galaxies and the status of Galactic searches for particle dark matter using a combination of terrestrial and space-based astroparticle detectors, and large scale astronomical surveys. I review the limits on the dark matter annihilation and scattering cross sections that can be extracted from both astroparticle experiments and astronomical observations, and explore the theoretical implications of these limits. I discuss methods to measure the properties of particle dark matter using future experiments, and conclude by highlighting the exciting potential for dark matter searches during the next decade, and beyond.

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Section: Mass Distributionmentioning

confidence: 99%

Galactic searches for dark matter

2013

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“…This model adopts the radial the density profile of the initial fluctuations, which results in the velocity dispersion developing from the center to the outer region. Zukin & Bertschinger (2010) have further derived selfsimilar solutions with tidal torque.…”

Section: Introductionmentioning

confidence: 99%

Confrontation of top-hat spherical collapse against dark halos from cosmological N-body simulations

Suto

Kitayama

Osato

et al. 2016

Publications of the Astronomical Society of Japan

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The top-hat spherical collapse model (TSC) is one of the most fundamental analytical frameworks to describe the non-linear growth of cosmic structure. TSC has motivated, and been widely applied in, various researches even in the current era of precision cosmology. While numerous studies exist to examine its validity against numerical simulations in a statistical fashion, there are few analyses to compare the TSC dynamics in an individual object-wise basis, which is what we attempt in the present paper. We extract 100 halos at z = 0 from a cosmological N-body simulation according to the conventional TSC criterion for the spherical over-density. Then we trace back their spherical counter-parts at earlier epochs. Just prior to the turn-around epoch of the halos, their dynamics is well approximated by TSC, but their turn-around epochs are systematically delayed and the virial radii are larger by ∼ 20% on average relative to the TSC predictions. We find that this systematic deviation is mainly ascribed to the non-uniformity/inhomogeneity of dark matter density profiles and the non-zero velocity dispersions, both of which are neglected in TSC. In particular, the inside-outcollapse and shell-crossing of dark matter halos play an important role in generating the significant velocity dispersion. The implications of the present result are briefly discussed.

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“…In this respect, angular momentum has received attention mostly as a source of corrections to the radial infall model (see e.g. [88] and references therein).…”

Section: Non-virialized Coresmentioning

confidence: 99%

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

Destri

2014

Phys. Rev. D

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We report the results of extended high-resolution numerical integrations of the Vlasov-Poisson equation for the collapse of spherically symmetric WDM halos. For thermal relics with mass m = 1 keV/c 2 , we find collapsed halos with cores of size from 0.1 to 0.6 kpc. The typical core is hollow, with the mass density decreasing towards the core center by almost three orders of magnitude from its maximum near the core radius rc. The core is in equilibrium with the diffused part of the halo but far from virialization. These properties are rooted in the conservation of the squared angular momentum and in the original excess, proper of WDM initial conditions, of kinetic energy in the core region. In a sample of more than one hundred simulated collapses, the values of rc and of the core density ρc are in the range typical of dwarf spheroids, while the maximal circular velocities Vmax are proper of small disk galaxies. The product µc = ρcrc takes values between 116 M /pc 2 and 283 M /pc 2 , while the surface density µ0, as determined from a Burkert fit, is roughly three times larger. From these data and data obtained at smaller values of m, we extrapolate for one particular halo µc = 263(308) M /pc 2 and µ0 = 754(855) M /pc 2 at m = 2(3.3) keV/c 2 , to be compared with the observed value 1402 . In view of the many improvements and enhancements available, we conclude that WDM is a viable solution for explaining the presence and the size of cores in low mass galaxies.

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Self-similar spherical collapse with tidal torque

Cited by 32 publications

References 46 publications

Galactic searches for dark matter

Galactic searches for dark matter

Confrontation of top-hat spherical collapse against dark halos from cosmological N-body simulations

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

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