Artículos con la etiqueta ‘modelo teórico’

The quantum state cannot be interpreted statistically

Por • 23 nov, 2011 • Category: Opinion

Quantum states are the key mathematical objects in quantum theory. It is therefore surprising that physicists have been unable to agree on what a quantum state represents. There are at least two opposing schools of thought, each almost as old as quantum theory itself. One is that a pure state is a physical property of system, much like position and momentum in classical mechanics. Another is that even a pure state has only a statistical significance, akin to a probability distribution in statistical mechanics. Here we show that, given only very mild assumptions, the statistical interpretation of the quantum state is inconsistent with the predictions of quantum theory. This result holds even in the presence of small amounts of experimental noise, and is therefore amenable to experimental test using present or near-future technology. If the predictions of quantum theory are confirmed, such a test would show that distinct quantum states must correspond to physically distinct states of reality.



Local Stability Analysis of a Thermo-Economic Model of a Chambadal-Novikov-Curzon-Ahlborn Heat Engine

Por • 4 sep, 2011 • Category: Economía

In this work we present a local stability analysis of the thermo-economic model of an irreversible heat engine working at maximum power conditions. The thermo-economic model is based on the maximization of a benefit function which is defined by the ratio of the power output and the total cost involved in the plant’s performance. Our study shows that, after a small perturbation, the system decays exponentially to the steady state determined by two different relaxation times.



When Models Interact with their Subjects: The Dynamics of Model Aware Systems

Por • 18 may, 2011 • Category: sociologia

A scientific model need not be a passive and static descriptor of its subject. If the subject is affected by the model, the model must be updated to explain its affected subject. In this study, two models regarding the dynamics of model aware systems are presented. The first explores the behavior of “prediction seeking” (PSP) and “prediction avoiding” (PAP) populations under the influence of a model that describes them. The second explores the publishing behavior of a group of experimentalists coupled to a model by means of confirmation bias. It is found that model aware systems can exhibit convergent random or oscillatory behavior and display universal 1/f noise.



Falta de política industrial acentuó el modelo rentístico

Por • 28 feb, 2011 • Category: Nacionales

Doce años después del ascenso de Hugo Chávez al poder la economía nacional está en la misma encrucijada de 1999. “No podemos seguir dependiendo de esa variable exógena que es el precio del barril de petróleo”, dijo el 2 de febrero en la Asamblea Nacional (AN) quien ese día asumía el cargo como Presidente de la República.



On Phenomenology of Complex Scientific Systems

Por • 26 feb, 2011 • Category: Filosofía

Performance evolution of a number of complex scientific and technical systems demonstrate exponential progress with time exp(+t/C) . An explanation of the characteristic exponential progress is offered.



Why Our Universe Must Have Been Born Inside a Black Hole

Por • 30 dic, 2010 • Category: Ciencia y tecnología

A small change to the theory of gravity implies that our universe inherited its arrow of time from the black hole in which it was born.



Un modelo teórico resuelve el efecto paradójico de los viajes en el tiempo

Por • 9 ago, 2010 • Category: Ciencia y tecnología

Ciertas características cuánticas evitarían “la paradoja del abuelo” y la necesidad de las distorsiones espacio-temporales

La fascinación por el viaje en el tiempo no se ciñe sólo a la ciencia ficción. Los científicos defienden su posibilidad, y se esfuerzan por producir modelos teóricos que la justifiquen. El último, creado por un físico del MIT, está basado en ciertas propiedades de la física cuántica que permitirían evitar el efecto paradójico de estos viajes, entre ellos, el peligro de que puedan cambiar el presente. Por Yaiza Martínez.