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The velocity distribution function of dark matter particles is expected to show significant departures from a Maxwell-Boltzmann distribution. This can have profound effects on the predicted dark matter - nucleon scattering rates in direct…

Astrophysics of Galaxies · Physics 2014-11-20 M. Kuhlen , N. Weiner , J. Diemand , P. Madau , B. Moore , D. Potter , J. Stadel , M. Zemp

The velocity distribution of dark matter is supposed to be isotropic Maxwell- Boltzmann distribution in most cases, however, its anisotropy is suggested by some simulations. We investigate conditions to give constraints on the anisotropy…

Cosmology and Nongalactic Astrophysics · Physics 2020-07-10 Keiko I. Nagao

Velocity distribution of dark matter is supposed to be isotropic Maxwell-Boltzmann distribution in most cases, however, other distribution models including anisotropic one are suggested by simulations. Directional direct detection of dark…

Cosmology and Nongalactic Astrophysics · Physics 2019-09-20 Keiko I. Nagao

The signals expected in WIMP direct detection experiments depend on the ultra-local dark matter distribution. Observations probe the local density, circular speed and escape speed, while simulations find velocity distributions that deviate…

Cosmology and Nongalactic Astrophysics · Physics 2011-01-27 Anne M. Green

An annual modulation in the event rate of the NaI detector of the DAMA collaboration has been used to infer the existence of particle dark matter in the Galactic halo. Bounds on the WIMP mass and WIMP-nucleon cross section have been…

High Energy Physics - Phenomenology · Physics 2010-02-03 Piero Ullio , Marc Kamionkowski

Dark matter N-body simulations suggest that the velocity distribution of dark matter is anisotropic. In this work we employ a mass model for the Milky Way whose parameters are determined from a fit to kinematical data. Then we adopt an…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Nassim Bozorgnia , Riccardo Catena , Thomas Schwetz

We investigate the effect of a coupling between dark matter and dark energy on the rates for the direct detection of dark matter. The magnitude of the effect depends on the strength $\kappa$ of this new interaction relative to gravity. The…

High Energy Physics - Phenomenology · Physics 2008-11-26 N. Tetradis , J. D. Vergados , Amand Faessler

The detection of the theoretically expected dark matter is central to particle physics cosmology. Current fashionable supersymmetric models provide a natural dark matter candidate which is the lightest supersymmetric particle (LSP). Such…

Astrophysics · Physics 2014-10-13 J. D. Vergados

We study the indirect detection of dark matter when the local dark matter velocity distribution depends upon position, as expected for the Milky Way and its dwarf spheroidal satellites, and the annihilation cross-section is not purely…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Francesc Ferrer , Daniel R. Hunter

The effect of some possible non standard WIMP velocity distributions, like the Debris Flows recently proposed, on the direct dark matter detection rates is investigated. We find that such distributions may be deciphered from the data,…

High Energy Physics - Phenomenology · Physics 2013-05-30 J. D. Vergados

Direct detection of dark matter with directional sensitivity has the potential to discriminate the dark matter velocity distribution. Especially, it will be suitable to discriminate isotropic distribution from anisotropic one. Analyzing…

Instrumentation and Methods for Astrophysics · Physics 2018-05-08 Keiko I. Nagao

Velocity distribution of dark matter is assumed to be isotropic in most cases, however, anisotropy is suggested in some simulations. Directional direct detection of dark matter is a hopeful way to discriminate the anisotropy of dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2020-07-10 Keiko I. Nagao

The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and…

High Energy Physics - Phenomenology · Physics 2015-05-30 J. D. Vergados

The detection of the theoretically expected dark matter is central to particle physics and cosmology. Current fashionable supersymmetric models provide a natural dark matter candidate which is the lightest supersymmetric particle (LSP).…

High Energy Physics - Phenomenology · Physics 2014-11-17 J. D. Vergados

We discuss the formation of dark matter caustics, and their possible detection by future dark matter experiments. The annual modulation expected in the recoil rate measured by a dark matter detector is discussed. We consider the example of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Aravind Natarajan

We consider dark matter velocity distributions with an anisotropic component, and analyze how the velocity structure can be probed in a solid state ionization detector with no directional detection capability using a daily modulation effect…

High Energy Physics - Phenomenology · Physics 2024-04-11 Matti Heikinheimo , Kai Nordlund , Sebastian Sassi , Kimmo Tuominen

We present a new determination of the local dark matter phase-space density. This result is obtained implementing, in the limit of isotropic velocity distribution and spherical symmetry, Eddington's inversion formula, which links univocally…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Riccardo Catena , Piero Ullio

The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and…

High Energy Physics - Phenomenology · Physics 2015-06-03 J. D. Vergados

Although the velocity distribution of dark matter is assumed to be generally isotropic, some studies have found that $\sim\hspace{-0.1cm}25$\% of the distribution can have anisotropic components. As the directional detection of dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2018-08-29 Keiko I. Nagao

The effects of astrophysical uncertainties on the exclusion limits at dark matter direct detection experiments are investigated for three scenarios: elastic, momentum dependent and inelastically scattering dark matter. We find that varying…

High Energy Physics - Phenomenology · Physics 2011-04-05 Christopher McCabe
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