Simulated magnetic field expulsion in neutron star cores

The study of long-term evolution of neutron star (NS) magnetic fields is key to understanding the rich diversity of NS observations, and to unifying their nature despite the different emission mechanisms and observed properties. Such studies in principle permit a deeper understanding of the most important parameters driving their apparent variety, e.g. radio pulsars, magnetars, X-ray dim isolated NSs, gamma-ray pulsars. We describe, for the first time, the results from self-consistent magnetothermal simulations considering not only the effects of the Hall-driven field dissipation in the crust, but also adding a complete set of proposed driving forces in a superconducting core. We emphasize how each of these core-field processes drive magnetic evolution and affect observables, and show that when all forces are considered together in vectorial form, the net expulsion of core magnetic flux is negligible, and will have no observable effect in the crust (consequently in the observed surface emission) on megayear time-scales. Our new simulations suggest that strong magnetic fields in NS cores (and the signatures on the NS surface) will persist long after the crustal magnetic field has evolved and decayed, due to the weak combined effects of dissipation and expulsion in the stellar core.

La influencia del discurso sobre cambio social en la agenda de los medios. El caso de la Plataforma de Afectados por la Hipoteca

Los movimientos sociales son uno de los motores del cambio social. Organizaciones como la Plataforma de Afectados por la Hipoteca (PAH) denuncian injusticias y cuestionan la construcción de significados sociales a través del discurso. Impulsan estrategias de automediación para, especialmente a través de las redes sociales, influir en la agenda mediática y el debate público. Mediante un análisis crítico del discurso cualitativo, nuestro objetivo es conocer si la PAH introduce sus temas y encuadres en la agenda mediática. Los resultados demuestran que este movimiento activista logra condicionar de qué se habla y también cómo se habla, obteniendo una cobertura favorable.