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Description of the evolution of inhomogeneities on a dark matter halo with the Vlasov equation

  • Paola Domínguez-FernándezEmail author
  • Erik Jiménez-Vázquez
  • Miguel Alcubierre
  • Edison Montoya
  • Darío Núñez
Research Article

Abstract

We use a direct numerical integration of the Vlasov equation in spherical symmetry with a background gravitational potential to determine the evolution of a collection of particles in different models of a galactic halo in order to test its stability against perturbations. Such collection is assumed to represent a dark matter inhomogeneity which is represented by a distribution function defined in phase-space. Non-trivial stationary states are obtained and determined by the virialization of the system. We describe some features of these stationary states by means of the properties of the final distribution function and final density profile. We compare our results using the different halo models and find that the NFW halo model is the most stable of them, in the sense that an inhomogeneity in this halo model requires a shorter time to virialize.

Keywords

Cosmology Dark matter Numerical methods 

Notes

Acknowledgements

This work was partially supported by DGAPA-UNAM Grant IN103514, by CONACYT Network Project 280908 “Agujeros Negros y Ondas Gravitatorias”, and by Conacyt Grant Fronteras 281.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Paola Domínguez-Fernández
    • 1
    • 2
    Email author
  • Erik Jiménez-Vázquez
    • 2
  • Miguel Alcubierre
    • 2
  • Edison Montoya
    • 3
  • Darío Núñez
    • 2
  1. 1.Argelander Institut für AstronomieUniversität BonnBonnGermany
  2. 2.Instituto de Ciencias NuclearesUniversidad Nacional Autónoma de MéxicoMexicoMexico
  3. 3.Escuela de FísicaUniversidad Industrial de SantanderBucaramangaColombia

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