Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Jareño, S. J. Núñez"'
The cold dark matter (CDM) scenario has proved successful in cosmology. However, we lack a fundamental understanding of its microscopic nature. Moreover, the apparent disagreement between CDM predictions and subgalactic-structure observations has pro
Externí odkaz:
http://arxiv.org/abs/1805.08112
We 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 $k^2\ll {\cal H}ma$, we
Externí odkaz:
http://arxiv.org/abs/1611.03793
The 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 theories ass
Externí odkaz:
http://arxiv.org/abs/1509.08819
We 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 expression fo
Externí odkaz:
http://arxiv.org/abs/1311.1402
Gauge bosons associated to new gauge symmetries under which the standard model particles are not charged are predicted in many extensions of the standard model of particles and interactions. We show that under very general conditions, the average ene
Externí odkaz:
http://arxiv.org/abs/1309.7447
Publikováno v:
Phys. Rev. D 87, 043523 (2013)
We consider homogeneous non-abelian vector fields with general potential terms in an expanding universe. We find a mechanical analogy with a system of N interacting particles (with N the dimension of the gauge group) moving in three dimensions under
Externí odkaz:
http://arxiv.org/abs/1212.3201
We 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 evolut
Externí odkaz:
http://arxiv.org/abs/1203.6221