Docta Complutense
Open Access Institutional Repository of the Complutense University of Madrid, that compiles scientific production to promote the visibility and impact of Complutense research.
With the collaboration of the Ministerio de Ciencia e Innovación and the Spanish Foundation for Science and Technology (FECYT).
Recent Submissions
Nonradial perturbations of static charged wormholes
(Physical Review D, 2026) Blázquez Salcedo, José Luis; González Romero, Luis Manuel; Khoo, Fech Scen; Kunz, Jutta; Navarro Moreno, Pablo
We investigate the nonradial quasinormal-mode spectrum of static charged Ellis-Bronnikov wormholes in Einstein-Maxwell theory minimally coupled to a phantom scalar field. The background solutions are known in closed form and comprise three classes: subcritical, critical and supercritical, which all approach the extremal Reissner-Nordstr & ouml;m geometry at the boundary of their domain of existence. We derive the linear perturbation equations for axial and polar sectors, including the coupled gravitational, electromagnetic and phantom-scalar degrees of freedom, and compute the corresponding spectra by means of a Chebyshev spectral method. The uncharged limit reproduces the known Ellis-Bronnikov spectrum and exhibits the expected electromagnetic isospectrality. For charged configurations, we track the axial and polar branches across the three families of solutions and identify the effect of the charge on the damping times and oscillation frequencies. In particular, we find that charge can substantially reduce damping rates as the extremal Reissner-Nordstr & ouml;m limit is approached. We also uncover a nonradial polar instability, most clearly visible in the fundamental l 1/4 2 branch for sufficiently large wormhole masses. This instability is distinct from the familiar radial Ellis-Bronnikov instability and shows that the nonradial sector imposes additional constraints on the dynamical viability of charged wormholes.
Coaliciones Promotoras y Política de Drogas en Colombia (2008-2018) : Acuerdo de Paz, sustitución voluntaria y la influencia de Estados Unidos
(2026) Trujillo Colmenares, Paola Andrea; Anguita Olmedo, Concepción
Históricamente, Colombia ha estado marcada por la coexistencia de instituciones democráticas formales, violencia armada persistente y profundas brechas territoriales, contexto que ha condicionado la presencia estatal y la orientación de la política de drogas; en su historia reciente, el país transitó de un paradigma de seguridad coercitivo hacia enfoques de paz y desarrollo territorial, sin eliminar las tensiones entre erradicación forzada y sustitución voluntaria.Por lo tanto, esta investigación analiza cómo y en qué condiciones una coalición, específicamente la coalición promotora de desarrollo alternativo y paz (DAyP), logró introducir un cambio parcial en la política de erradicación de cultivos de uso ilícito en Colombia entre 2008 y 2018, en un subsistema históricamente dominado por un paradigma coercitivo y condicionado por la relación con Estados Unidos...
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