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Abstract: In this work we analyze and review cosmological models in which the dynamicsof a single scalar field accounts for a unified description of the Dark Matterand Dark Energy sectors, dubbed Unified Dark Matter UDM models. In thisframework, we consider the general Lagrangian of k-essence, which allows tofind solutions around which the scalar field describes the desired mixture ofDark Matter and Dark Energy. We also discuss static and spherically symmetricsolutions of Einstein-s equations for a scalar field with non-canonical kineticterm, in connection with galactic halo rotation curves.



Autor: Daniele Bertacca, Nicola Bartolo, Sabino Matarrese

Fuente: https://arxiv.org/







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