Luis Garcia

Within ordinary ---unitary--- quantum mechanics there exist global protocols that allow to verify that no definite event ---an outcome to which a probability can be associated--- occurs. Instead, states that start in a coherent superposition over possible outcomes always remain as a superposition. We show that, when taking into account fundamental errors in measuring length and time intervals, that have been put forward as a consequence of a conjunction of quantum mechanical and general relativity arguments, there are instances in which such global protocols no longer allow to distinguish whether the state is in a superposition or not. All predictions become identical as if one of the outcomes occurs, with probability determined by the state. We use this as a criteria to define events, as put forward in the Montevideo Interpretation of Quantum Mechanics. We analyze in detail the occurrence of events in the paradigmatic case of a particle in a superposition of two different locations. We argue that our approach provides a consistent single-world picture of the universe, thus allowing an economical way out of the limitations imposed by a recent theorem by Frauchiger and Renner showing that having a self-consistent single-world description of the universe is incompatible with quantum theory. In fact, the main observation of this paper may be stated as follows: If quantum mechanics is extended to include gravitational effects to a QG theory, then QG, S, and C are satisfied.

We make a first attempt to axiomatically formulate the Montevideo interpretation of quantum mechanics. In this interpretation environmental decoherence is supplemented with loss of coherence due to the use of realistic clocks to measure time to solve the measurement problem. The resulting formulation is framed entirely in terms of quantum objects without having to invoke the existence of measurable classical quantities like the time in ordinary quantum mechanics. The formulation eliminates any privileged role to the measurement process giving an objective definition of when an event occurs in a system.

La investigación centra su interés en determinar el impacto que ha tenido la implementación de la cátedra de la Paz en las instituciones educativas de Ciudad Bolívar en la construcción de paz y ciudadanía. Desde la investigación cualitativa en una perspectiva hermenéutica y el método narrativo, se realizó una revisión documental. Se concluye que, el abordaje de la cátedra de la paz requiere en la escuela, una perspectiva holística que fomente la reflexión crítica sobre el conflicto armado, construcción de memoria histórica, fortalecimiento del tejido social y cumplimiento de los Objetivos de Desarrollo Sostenible.

We argue that it is fundamentally impossible to recover information about quantum superpositions when a quantum system has interacted with a sufficiently large number of degrees of freedom of the environment. This is due to the fact that gravity imposes fundamental limitations on how accurate measurements can be. This leads to the notion of undecidability: there is no way to tell, due to fundamental limitations, if a quantum system evolved unitarily or suffered wavefunction collapse. This in turn provides a solution to the problem of outcomes in quantum measurement by providing a sharp criterion for defining when an event has taken place. We analyze in detail in examples two situations in which in principle one could recover information about quantum coherence: a) “revivals” of coherence in the interaction of a system with the measurement apparatus and the environment and b) the measurement of global observables of the system plus apparatus plus environment. We show in the examples that the fundamental limitations due to gravity and quantum mechanics in measurement prevent both revivals from occurring and the measurement of global observables. It can therefore be argued that the emerging picture provides a complete resolution to the measurement problem in quantum mechanics.

We make a first attempt to axiomatically formulate the Montevideo interpretation of quantum mechanics. In this interpretation environmental decoherence is supplemented with loss of coherence due to the use of realistic clocks to measure time to solve the measurement problem. The resulting formulation is framed entirely in terms of quantum objects. Unlike in ordinary quantum mechanics, time only plays the role of an unobservable parameter. The formulation eliminates any privileged role of the measurement process giving an objective definition of when an event occurs in a system.

La lectura plotiniana de la sincronicidad entre astros y hechos humanos en vez de la lectura causa-efecto de la astrología judiciaria tradicional fue la visión más seguida por el humanismo. Las estrellas no representan poderes en si mismos sino como símbolos o signos. El hombre sabio, y así lo entendieron también los humanistas neoplatóncios, es aquél que sabe interpretar los símbolos desentrañando el sentido de la simpatía o analogía universales. El poder simbólico, por basarse en una inspiración abierta más que en el raciocinio lógico, entronca con otros lenguajes simbólicos, incluido el de la literatura, al que presta numerosos recursos

El presente trabajo se propone argumentar que el proyecto sociopolítico enunciado por Alberdi en Bases y puntos de partida para la organización política de la República Argentina contribuyó a imposibilitar la constitución del moderno estado nacional cuya existencia buscó promover. El logro de dicho objetivo sólo resultará posible a partir de explicitar los supuestos alrededor de los que se estructura el razonamiento que permite alcanzar dicha conclusión; hacerlo implicará, en primer lugar, señalar las reflexiones de Aníbal Quijano en torno a la constitución de los modernos estados nacionales y al eurocentrismo, en segundo lugar, establecer el carácter eurocéntrico de Las Bases y, por último, reconstruir el razonamiento que sustenta la idea directriz que atraviesa al trabajo. This paper intends to argue that the sociopolitical project enunciated by Alberdi on Bases and starting points for the political organization of Argentina contributed to preclude the constitution of the modern national state of which existence it sought to promote. Achieving this goal will only be possible by making explicit the assumptions from which the reasoning that allows to reach such conclusion are structured; it will involve, first, to point out Quijano's reflections about the constitution of modern national states and the eurocentrism, secondly, to establish The Bases's eurocentric nature and, finally, to rebuild the reasoning behind the leading idea running through the work