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Thanks to the quality and variety of recent observations, we are now capable of measuring cosmological parameters with a 1% precision. For a decade, we can talk about a precision cosmological science. However, even if we have a good control over[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Núñez Jareño, Santos José | Springer | 2016-03-03The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theorie[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, Santos José | IOP publishing ltd | 2014-03We show that the energy-momentum tensor of homogeneous fields of arbitrary spin in an expanding universe is always isotropic in average provided the fields remain bounded and evolve rapidly compared to the rate of expansion. An analytic expressi[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, Santos José ; Hallabrin, C. | American Physical Society | 2012-07-10We consider homogeneous Abelian vector fields in an expanding universe. We find a mechanical analogy in which the system behaves as a particle moving in three dimensions under the action of a central potential. In the case of bounded and rapid e[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Núñez Jareño, Santos José | Springer | 2017-02-13We study the dynamics of cosmological perturbations in models of dark matter based on ultralight coherent vector fields. Very much as for scalar field dark matter, we find two different regimes in the evolution: for modes with k^(2) « Hma, we ha[...]
