Person:
Jannes, Gil

First Name

Gil

Last Name

Jannes

URI

https://hdl.handle.net/20.500.14352/74630

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Económicas y Empresariales

Department

Economía Financiera, Actuarial y Estadística

Area

Estadística e Investigación Operativa

Identifiers

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Now showing 1 - 10 of 18

Quantum non-gravity and stellar collapse
(Foundations of physics, 2011) Barceló, Carlos; Garay Elizondo, Luis Javier; Jannes, Gil
Observational indications combined with analyses of analogue and emergent gravity in condensed matter systems support the possibility that there might be two distinct energy scales related to quantum gravity: the scale that sets the onset of quantum gravitational effects E-B ( related to the Planck scale) and the much higher scale E-L signalling the breaking of Lorentz symmetry. We suggest a natural interpretation for these two scales: E-L is the energy scale below which a special relativistic spacetime emerges, E-B is the scale below which this spacetime geometry becomes curved. This implies that the first 'quantum' gravitational effect around E-B could simply be that gravity is progressively switched off, leaving an effective Minkowski quantum field theory up to much higher energies of the order of E-L. This scenario may have important consequences for gravitational collapse, inasmuch as it opens up new possibilities for the final state of stellar collapse other than an evaporating black hole.
Project number: 245
Big data en educación II: metodologías adaptativas en el proceso de enseñanza-aprendizaje desde el diagnóstico del estudiante
(2019) Hernández Estrada, Adolfo; García Pérez, Enrique; Fernández-Cid Enríquez, Matilde; Vela Pérez, María; Peñaloza Figueroa, Juan Luis; Martínez Rodríguez, María Elena; Arteaga Martínez, Blanca; Macías Sánchez, Jesús; Martín Apaolaza, Nirian; Fernández-Crehuet Santos, José María; Pérez Martín, María; Mateos-Aparicio Morales, Gregoria; Fernández Molina, María Elia; Dorado Sánchez, Juan; Ruozzi López, Alberto; Martíns Pinto, Ana Rita; Martínez de La Fuente, Jorge Iván; Andrés García, Ángel De; Carrasco Pradas, Mª Desamparados; Álvarez Sáez, Manuel; Ferrer Caja, José María; Aparicio Sánchez, María Del Socorro; Barreal Pernas, Jesús; Jannes, Gil
The trans-Planckian problem as a guiding principle
(Journal of high energy physics, 2011) Barbado, L. C.; Barceló, C.; Garay Elizondo, Luis Javier; Jannes, Gil
We use the avoidance of the trans-Planckian problem of Hawking radiation as a guiding principle in searching for a compelling scenario for the evaporation of black holes or black-hole-like objects. We argue that there exist only three possible scenarios, depending on whether the classical notion of long-lived horizon is preserved by high-energy physics and on whether the dark and compact astrophysical objects that we observe have long-lived horizons in the first place. Along the way, we find that i) a theory with high-energy superluminal signalling and a long-lived trapping horizon would be extremely unstable in astrophysical terms and that i i) stellar pulsations of objects hovering right outside but extremely close to their gravitational radius can result in a mechanism for Hawking-like emission.
Spatial and Temporal Wildfire Decomposition as a Tool for Assessment and Planning of an Efficient Forest Policy in Galicia (Spain)
(Forests, 2020) Barreal Pernas, Jesús; Jannes, Gil
Wildfires in Galicia have various temporal and spatial trends. This temporal and spatial behavior must therefore be studied and taken into account in order to design more efficient forest policies. Since both factors are inhomogeneous, it was proposed to study them using a Gini index decomposition. The number of fires and the affected forest area were studied in terms of the months and the forest districts, which serve as basic temporal and spatial elements. The objective of this methodology is to know the months in which the fires are most concentrated throughout the administrative geographical districts of the various provinces of Galicia, and the elasticity of each month with respect to the global concentration. It is also used to know the temporal inequality in each forest district of Galicia and its contribution to the global index. To apply this methodology, monthly data are taken from 2006 to 2015 for each of the Galician forest districts. It is found that there is a high spatial concentration of fires in the autumn and winter months, and a much lower one in the remaining months. On the other hand, most districts register a great temporal inequality in the occurrence of fires. Tentative suggestions of how the forest policy in Galicia could be improved by taking into account both these spatial and temporal patterns are discussed.
Emergent gravity: the BEC paradigm
(2009) Jannes, Gil; Barceló Serón, Carlos; Garay Elizondo, Luis. J.
We study selected aspects of quantum gravity phenomenology inspired by the gravitational analogy in Bose–Einstein condensates (BECs). We first review the basic ideas and formalism of analogue gravity in BECs, with particular emphasis on the possibility of simulating black holes. We stress that the dispersion relation in a BEC has a relativistic form in the hydrodynamic limit, and acquires non-relativistic, ‘superluminal’ modifications at high frequencies. This makes it a particularly interesting model for many scenarios of quantum gravity phenomenology which consider a possible violation of local Lorentz invariance at high energies. In particular, it allows the study of kinematical corrections that such quantum gravity scenarios could impose on general relativity.
La narrativa como herramienta docente dentro de la gamificación de la estadística en el Grado en Turismo
(Digital Education Review, 2019) Barreal Pernas, Jesús; Jannes, Gil
La gamificación consiste en ludificar los contenidos de una determinada materia o asignatura a través de dinámicas, mecánicas y componentes. Con este proceso se puede lograr una mayor motivación e implicación del alumno, así como fomentar el desarrollo de competencias y del aprendizaje autónomo. El presente trabajo describe el proceso de implementación de esta herramienta para la asignatura “Estadística Aplicada al Sector Turístico” del Grado en Turismo con el objetivo de lograr presentar un proceso formativo dinámico y atractivo para el alumno. No obstante, se elabora desde un punto transversal que permita su implementación en asignaturas similares de enseñanzas superiores de grado. En más detalle, se desarrolla una narrativa entorno a la promoción profesional del alumno dentro de una empresa hotelera ficticia donde irá alcanzando mayor rango profesional a medida que avanza el juego y va superando una serie de pruebas/eventos. Esta narrativa fomenta el interés intrínseco en la actividad por parte del alumno, al mismo tiempo que refuerza la utilidad del propio juego de cara a futuras experiencias profesionales.
Project number: 301
Estrategia de gamificación aplicada a métodos estadísticos en el proceso de aprendizaje en enseñanzas turísticas
(2020) Barreal Pernas, Jesús; Jannes, Gil; Albert García, Carlos; Vela Pérez, María; Gutiérrez Salinero, María Ángeles; López Fernández, Angel Luis; Arroyo Barrigüete, José Luis; Montiel Ben Allal, Nora; Agustín Herrera, Alma; Suarez-Varela Marti, Olga; Krak, Darya; González Gutiérrez, Nebiur; Ferrando Aguirre, Daniel; López Domingo, Belén; Lluna Taverner, Francisco José; Cisneros Martínez, José David
Project number: 416
Experiential Learning: Interpretación socioeconómica del Covid-19 desde el aula a la práctica empírica
(2021) Jannes, Gil; Amundaray Carmona, Samai; Encabo Herrera, Víctor; Ferrer Caja, José María; Morales Chinea, Ainhoa; Ribes Rossiñol De Zagranada, Juan; Riego Miedes, Enrique; Usar Artiles, Alejandro; Veintemillas Fernández, Víctor
Memoria final del proyecto de Innovación Docente nº 416
Chronology protection implementation in analogue gravity
(The European Physical Journal C, 2022) Barceló, Carlos; Eguia Sánchez, Jokin; García Moreno, Gerardo; Jannes, Gil
Analogue gravity systems offer many insights into gravitational phenomena, both at the classical and at the semiclassical level. The existence of an underlying Minkowskian structure (or Galilean in the non-relativistic limit) in the laboratory has been argued to directly forbid the simulation of geometries with Closed Timelike Curves (CTCs) within analogue systems. We will show that this is not strictly the case. In principle, it is possible to simulate spacetimes with CTCs whenever this does not entail the presence of a chronological horizon separating regions with CTCs from regions that do not have CTCs. We find an Analogue-gravity Chronology protection mechanism very similar in spirit to Hawking’s Chronology Protection hypothesis. We identify the universal behaviour of analogue systems near the formation of such horizons and discuss the further implications that this analysis has from an emergent gravity perspective. Furthermore, we build explicit geometries containing CTCs, for instance spacetimes constructed from two warp-drive configurations, that might be useful for future analysis, both from a theoretical and an experimental point of view.
Attraction opportunities for enotourism among international travellers to spanish wine PDO regions
(GeoJournal, 2024) Jannes, Gil; Barreal Pernas, Jesús
We analyze why the impact of wine tourism in Spain lags behind France and Italy. We argue that a key factor is a lack of attraction of foreign enotourists, especially among tourists who visit a wine PDO region anyway. The international tourist profiles visiting such Spanish wine PDOs are identified and segmented with the ultimate objective of fine-tuning the gastro-touristic offer in these regions. In particular, an innovative two-step Latent Class Model (LCM) with covariates is developed. The first step concerns the sociodemographic profiles of potential international enotourists, which is therefore complementary to existing segmentations of actual enotourists. The second step uses touristic activities in order to profile the possible ways of reaching different types of tourists. The daily expenditure and the tourists' valuation are included as covariates, allowing to predict the probability of class membership, and thus to define priority target profiles for market positioning.