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

Full item page

Search Results

Now showing 1 - 10 of 17

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.
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.
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.
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
Conceptual Challenges on the Road to the Multiverse
(Universe, 2019) Alonso Serrano, Ana; Jannes, Gil
The current debate about a possible change of paradigm from a single universe to a multiverse scenario could have deep implications on our view of cosmology and of science in general. These implications therefore deserve to be analyzed from a fundamental conceptual level. We briefly review the different multiverse ideas, both historically and within contemporary physics. We then discuss several positions within philosophy of science with regard to scientific progress, and apply these to the multiverse debate. Finally, we construct some key concepts for a physical multiverse scenario and discuss the challenges this scenario has to deal with in order to provide a solid, testable theory.
Project number: 302
Experiential learning: del aula a la práctica empírica
(2020) Jannes, Gil; Ferrer Caja, José María; Moyano Armendariz, Mónica; Ribes Rossiñol De Zagranada, Juan; Riego Miedes, Enrique; Encabo Herrera, Víctor; Amundaray Carmona, Samai; Connor Dennis, Hampton; Domínguez Plata, Fátima; Morales Chinea, Ainhoa; Rivera Garrido, Blanca; Veintemillas Fernández, Víctor
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.
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
Hawking versus Unruh effects, or the difficulty of slowly crossing a black hole horizon
(Journal of High Energy Physics, 2016) Barbado, Luis C.; Barceló, Carlos; Garay Elizondo, Luis Javier; Jannes, Gil
When analyzing the perception of Hawking radiation by different observers, the Hawking effect becomes mixed with the Unruh effect. The separation of both effects is not always clear in the literature. Here we propose an inconsistency-free interpretation of what constitutes a Hawking effect and what an Unruh effect. An appropriate interpretation is important in order to elucidate what sort of effects a detector might experience depending on its trajectory and the state of the quantum field. Under simplifying assumptions we introduce an analytic formula that separates these two effects. Armed with the previous interpretation we argue that for a free-falling detector to cross the horizon without experiencing high-energy effects, it is necessary that the horizon crossing is not attempted at low velocities.
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.