Aharonov-Bohm Effect and Hidden Photons

Signs of hypothetical light gauge bosons from a hidden sector may appear in Aharonov-Bohm-like experiments. The absence of signal in carried on experiments allow us to set a modest constraint to the mass and coupling constant of these particles. Our findings open the possibility to exploit the leaking of hidden magnetic field in a different setup of experiments.Comment: Contributed to the 9th Patras Workshop on Axions, WIMPs and WISPs, Mainz, June 24-28, 201

Vortex solutions of an Abelian Higgs model with visible and hidden sectors

We study vortex solutions in a theory with dynamics governed by two weakly coupled Abelian Higgs models, describing a hidden sector and a visible sector. We analyze the radial dependence of the axially symmetric solutions constructed numerically and discuss the stability of vortex configurations for different values of the model parameters, studying in detail vortex decay into lower energy configurations. We find that even in a weak coupling regime vortex solutions strongly depend on the parameters of both the visible and hidden sectors. We also discuss on qualitative grounds possible implications of the existence of a hidden sector in connection with superconductivity.Comment: 22 pages, 10 figures, version accepted in JHE

Cosmic Neutrino Background as a Ferromagnet

If cosmic background neutrinos interact very weakly with each other, through spin-spin interactions, then they may have experienced a phase transition, leading to a ferromagnetic ordering. The small magnetic field resulting from ferromagnetic ordering -- if present before galaxy formation -- could act as a primordial seed of the magnetic fields observed in several galaxies. Our findings suggest that the magnetization could occur in the right epoch, if the exchange boson of neutrino-neutrino interaction is a massless boson beyond the Standard Model, with a coupling constant of $2.2\times 10^{-13} \left(\frac{m_\nu}{10^{-4}\,\rm{eV}}\right)^2<g<2.3\times 10^{-7}$. The estimation of the magnetic seed is $2.3 \times 10^{-27}\,\rm{G}\lesssim B_{\rm CNB}\lesssim 6.8\times 10^{-10}G$.Comment: 4 pages. Accepted for publication in Physics Letters

A two particle hidden sector and the oscillations with photons

We present a detailed study of the oscillations and optical properties for vacuum, in a model for the dark sector that contains axion-like particles and hidden photons. In this model, both can couple to photons. We provide bounds for the couplings versus the mass, using current results from ALPS-I and PVLAS. We also discuss the challenges for the detection of models with more than one hidden particle in light shining trough wall-like experiments.Comment: 23 pages, 7 figures. Figures are coloure

Chern-Simons-Higgs Theory with Visible and Hidden Sectors and its N=2{\cal N}=2 SUSY Extension

We study vortex solutions in Abelian Chern-Simons-Higgs theories with visible and hidden sectors. We first consider the case in which the two sectors are connected through a BF-like gauge mixing term with no explicit interaction between the the two scalars. Since first order Bogomolny equations do not exist in this case, we derive the second order field equations. We then proceed to an ${\cal N}=2$ supersymmetric extension including a Higgs portal mixing among the visible and hidden charged scalars. As expected, Bogomolnyi equations do exist in this case and we study their string-like solutions numerically.Comment: 10 pages, 12 figures. Several typos fixed and the Gauss law is explicitly written, figures correctly shown. Accepted in PL

Effects of heavy bosonic excitations on QED vacuum

We discuss the contribution of axion-like excitations (ALE) to the vacuum birrefringence in the limit $m_A \gtrsim \omega$, where $m_A$ is the mass of the excitation and $\omega$ the energy of test photons interacting with an external (intense) magnetic field. The relevance of this term with respect to the QED contribution depends on the ratio $g_A/m_A$ and, from present bounds on the mass and the coupling constant $g_A$, we find that in the present low energy regime, it ranges from $10^{-14}$ to $10^2$ suggesting an interesting alternative to explore.Comment: References adde and section II rewritten. MPLA in pres

El patrocinador de la corrupción pública es el sector privado

En nuestra cultura se acostumbra que a cada nuevo integrante de la familia se le delegue un padrino, que sería quien cuide de los niños si los padres llegaran a faltar. Algo similar ocurre en el sector público, en algún momento de su carrera los funcionarios públicos, sienten un abandono o descuido por parte del Gobierno y gran falta de atención por parte del estado, que cuando viene un amable caballero con una linda sonrisa en un estupendo carruaje lleno de hermosos regalos, brindándole todo el esmero que desea inmediatamente acepta ser su ahijado. El Gran Padrino pondrá en situaciones tan cómodas a su ahijado, que éste se acostumbrará a tener y obtener lo que desea, llegará a encontrarse en un estado de malcriadez. Y así como los niños que se acostumbran a que todos a su alrededor hagan lo que desean, de igual manera este funcionario anhelará tener el poder de manipular su entorno. El poder es uno de los aspectos más deseados por los seres humanos, bien sea por los que siempre han tenido lo que desean o por aquellos que poco han poseído y consideran que obteniendo Poder tendrán todo lo demá