Ostrogradski approach for the Regge-Teitelboim type cosmology

We present an alternative geometric inspired derivation of the quantum cosmology arising from a brane universe in the context of {\it geodetic gravity}. We set up the Regge-Teitelboim model to describe our universe, and we recover its original dynamics by thinking of such field theory as a second-order derivative theory. We refer to an Ostrogradski Hamiltonian formalism to prepare the system to its quantization. Our analysis highlights the second-order derivative nature of the RT model and the inherited geometrical aspect of the theory. A canonical transformation brings us to the internal physical geometry of the theory and induces its quantization straightforwardly. By using the Dirac canonical quantization method our approach comprises the management of both first- and second-class constraints where the counting of degrees of freedom follows accordingly. At the quantum level our Wheeler-De Witt Wheeler equation agrees with previous results recently found. On these lines, we also comment upon the compatibility of our approach with the Hamiltonian approach proposed by Davidson and coworkers.Comment: 11 pages, 2 figures, accepted for publication in Phys. Rev.

An Alternative Interpretation for the Moduli Fields of the Cosmology Associated to Type IIB Supergravity with Fluxes

We start with a particular cosmological model derived from type IIB supergravity theory with fluxes, where usually the dilaton is interpreted as a Quintessence field. Instead of that, in this letter we interpret the dilaton as the dark matter of the universe. With this alternative interpretation we find that in this supergravity model gives a similar evolution and structure formation of the universe compared with the $\Lambda$CDM model in the linear regime of fluctuations of the structure formation. Some free parameters of the theory are fixed using the present cosmological observations. In the non-linear regimen there are some differences between the type IIB supergravity theory with the traditional CDM paradigm. The supergravity theory predicts the formation of galaxies earlier than the CDM and there is no density cusp in the center of galaxies. These differences can distinguish both models and can give a distinctive feature to the phenomenology of the cosmology coming from superstring theory with fluxes.Comment: 7 pages, 5 figures, references added, minor modifications, typos corrected. Version accepted for publication in IJMP

Atomic-Scale Variations of the Mechanical Response of 2D Materials Detected by Noncontact Atomic Force Microscopy

We show that noncontact atomic force microscopy (AFM) is sensitive to the local stiffness in the atomicscale limit on weakly coupled 2D materials, as graphene on metals. Our large amplitude AFM topography and dissipation images under ultrahigh vacuum and low temperature resolve the atomic and moiré patterns in graphene on Pt (111), despite its extremely low geometric corrugation. The imaging mechanisms are identified with a multiscale model based on density-functional theory calculations, where the energy cost of global and local deformations of graphene competes with short-range chemical and long-range van der Waals interactions. Atomic contrast is related with short-range tip-sample interactions, while the dissipation can be understood in terms of global deformations in the weakly coupled graphene layer. Remarkably, the observed moiré modulation is linked with the subtle variations of the local interplanar graphene-substrate interaction, opening a new route to explore the local mechanical properties of 2D materials at the atomic scaleWe thank the Marie Curie ITN Network “ACRITAS” (Grant No. FP7-PEOPLE-2012-ITN-317348) funded by the European Commission under the FP7 Marie Curie PEOPLE programme and the Spanish MINECO (Projects No. CSD2010-00024, No. MAT2011-23627, No. MAT2013-41636-P, and No. MAT2014-54484-P) for financial support. Computer time was provided by the Spanish Supercomputer Network (RES) at Marenostrum III (BSC, Barcelona) and Magerit (CesViMa, Madrid) computers. P. P. was supported by the Ramón y Cajal progra

Deforming baryons into confining strings

We find explicit probe D3-brane solutions in the infrared of the Maldacena-Nunez background. The solutions describe deformed baryon vertices: q external quarks are separated in spacetime from the remaining N-q. As the separation is taken to infinity we recover known solutions describing infinite confining strings in ${\mathcal{N}}=1$ gauge theory. We present results for the mass of finite confining strings as a function of length. We also find probe D2-brane solutions in a confining type IIA geometry, the reduction of a G_2 holonomy M theory background. The relation between these deformed baryons and confining strings is not as straightforward.Comment: 1+13 pages. LaTeX. 3 Figures. Factor of 2N fixed to N for the IIA background. Minor changes to tex

Deformation quantization of cosmological models

The Weyl-Wigner-Groenewold-Moyal formalism of deformation quantization is applied to cosmological models in the minisuperspace. The quantization procedure is performed explicitly for quantum cosmology in a flat minisuperspace. The de Sitter cosmological model is worked out in detail and the computation of the Wigner functions for the Hartle-Hawking, Vilenkin and Linde wave functions are done numerically. The Wigner function is analytically calculated for the Kantowski-Sachs model in (non)commutative quantum cosmology and for string cosmology with dilaton exponential potential. Finally, baby universes solutions are described in this context and the Wigner function is obtained.Comment: 37 pages, 16 figure

Consumo de combustible y emisiones del sector transporte aéreo en la ciudad de Rosario

El rol de las ciudades como grandes emisoras de Gases de Efecto Invernadero (GEI), determina la necesidad de estimar las emisiones relativas al consumo energético. Presentamos resultados de las emisiones de GEI en el Transporte aéreo, analizando tres métodos para el cálculo de combustible: a) Método Simplificado, b) Flight Simulator, c) Emission Inventory Guidebook. Seleccionamos como criterio el promedio de los métodos mencionados, con una incertidumbre de 8,9% con respecto a los valores extremos. El consumo anual de combustible para transporte aéreo es de 13.6 Mlitros. Para el cálculo de emisiones consideramos los cuatro criterios. Concluimos que el Método Actividad Inducida es el más apropiado con un valor total de 8.8 TnCO2equivalentes anuales. Comparamos además las emisiones de distintos medios de transporte entre Rosario-Buenos Aires con respecto al avión. El auto diésel refleja menores emisiones de GEI en un porcentaje de -98,69% y el tren de -99,90%.The role of cities as mayor contributors of Greenhouse Gases (GHG), determine the importance of measuring the relative emissions of energy consumption. In this work, we present the results of GHG emissions of aviation sector, analyzing three different methods to determine fuel consumption: a) Simplify Method, b) Flight Simulator, c) Emission Inventory Guidebook. We choose as fuel consumption criteria the average of the three mentioned methods, with 8,9% of uncertainty with respect of the extreme values. The yearly fuel consumption for aviation sector is 13.6 Ml. For the emissions calculations we analyze four methods. We come to the conclusion that the activity induced method is the more appropriate with a total value of 8.8 TnCO2eq per year. We also compare the emissions of different transportation modes from Rosario to Buenos Aires with the aviation mode. The percentage difference of a diesel car is -98.69%, and for the train is -99,90%.Tema 7: Uso eficiente y racional de la energía. Políticas y economía energética.Facultad de Arquitectura y Urbanism

Consumo de combustible y emisiones del sector transporte aéreo en la ciudad de Rosario

El rol de las ciudades como grandes emisoras de Gases de Efecto Invernadero (GEI), determina la necesidad de estimar las emisiones relativas al consumo energético. Presentamos resultados de las emisiones de GEI en el Transporte aéreo, analizando tres métodos para el cálculo de combustible: a) Método Simplificado, b) Flight Simulator, c) Emission Inventory Guidebook. Seleccionamos como criterio el promedio de los métodos mencionados, con una incertidumbre de 8,9% con respecto a los valores extremos. El consumo anual de combustible para transporte aéreo es de 13.6 Mlitros. Para el cálculo de emisiones consideramos los cuatro criterios. Concluimos que el Método Actividad Inducida es el más apropiado con un valor total de 8.8 TnCO2equivalentes anuales. Comparamos además las emisiones de distintos medios de transporte entre Rosario-Buenos Aires con respecto al avión. El auto diésel refleja menores emisiones de GEI en un porcentaje de -98,69% y el tren de -99,90%.The role of cities as mayor contributors of Greenhouse Gases (GHG), determine the importance of measuring the relative emissions of energy consumption. In this work, we present the results of GHG emissions of aviation sector, analyzing three different methods to determine fuel consumption: a) Simplify Method, b) Flight Simulator, c) Emission Inventory Guidebook. We choose as fuel consumption criteria the average of the three mentioned methods, with 8,9% of uncertainty with respect of the extreme values. The yearly fuel consumption for aviation sector is 13.6 Ml. For the emissions calculations we analyze four methods. We come to the conclusion that the activity induced method is the more appropriate with a total value of 8.8 TnCO2eq per year. We also compare the emissions of different transportation modes from Rosario to Buenos Aires with the aviation mode. The percentage difference of a diesel car is -98.69%, and for the train is -99,90%.Tema 7: Uso eficiente y racional de la energía. Políticas y economía energética.Facultad de Arquitectura y Urbanism

Consumo de combustible y emisiones del sector transporte aéreo en la ciudad de Rosario

El rol de las ciudades como grandes emisoras de Gases de Efecto Invernadero (GEI), determina la necesidad de estimar las emisiones relativas al consumo energético. Presentamos resultados de las emisiones de GEI en el Transporte aéreo, analizando tres métodos para el cálculo de combustible: a) Método Simplificado, b) Flight Simulator, c) Emission Inventory Guidebook. Seleccionamos como criterio el promedio de los métodos mencionados, con una incertidumbre de 8,9% con respecto a los valores extremos. El consumo anual de combustible para transporte aéreo es de 13.6 Mlitros. Para el cálculo de emisiones consideramos los cuatro criterios. Concluimos que el Método Actividad Inducida es el más apropiado con un valor total de 8.8 TnCO2 equivalentes anuales. Comparamos además las emisiones de distintos medios de transporte entre Rosario-Buenos Aires con respecto al avión. El auto diésel refleja menores emisiones de GEI en un porcentaje de -98,69% y el tren de -99,90%.The role of cities as mayor contributors of Greenhouse Gases (GHG), determine the importance of measuring the relative emissions of energy consumption. In this work, we present the results of GHG emissions of aviation sector, analyzing three different methods to determine fuel consumption: a) Simplify Method, b) Flight Simulator, c) Emission Inventory Guidebook. We choose as fuel consumption criteria the average of the three mentioned methods, with 8,9% of uncertainty with respect of the extreme values. The yearly fuel consumption for aviation sector is 13.6 Ml. For the emissions calculations we analyze four methods. We come to the conclusion that the activity induced method is the more appropriate with a total value of 8.8 TnCO2eq per year. We also compare the emissions of different transportation modes from Rosario to Buenos Aires with the aviation mode. The percentage difference of a diesel car is -98.69%, and for the train is -99,90%.Tema 10: Educación y capacitación en energías renovables y uso racional de la energía.Facultad de Arquitectura y Urbanism

Consumo de combustible y emisiones del sector transporte aéreo en la ciudad de Rosario

El rol de las ciudades como grandes emisoras de Gases de Efecto Invernadero (GEI), determina la necesidad de estimar las emisiones relativas al consumo energético. Presentamos resultados de las emisiones de GEI en el Transporte aéreo, analizando tres métodos para el cálculo de combustible: a) Método Simplificado, b) Flight Simulator, c) Emission Inventory Guidebook. Seleccionamos como criterio el promedio de los métodos mencionados, con una incertidumbre de 8,9% con respecto a los valores extremos. El consumo anual de combustible para transporte aéreo es de 13.6 Mlitros. Para el cálculo de emisiones consideramos los cuatro criterios. Concluimos que el Método Actividad Inducida es el más apropiado con un valor total de 8.8 TnCO2equivalentes anuales. Comparamos además las emisiones de distintos medios de transporte entre Rosario-Buenos Aires con respecto al avión. El auto diésel refleja menores emisiones de GEI en un porcentaje de -98,69% y el tren de -99,90%.The role of cities as mayor contributors of Greenhouse Gases (GHG), determine the importance of measuring the relative emissions of energy consumption. In this work, we present the results of GHG emissions of aviation sector, analyzing three different methods to determine fuel consumption: a) Simplify Method, b) Flight Simulator, c) Emission Inventory Guidebook. We choose as fuel consumption criteria the average of the three mentioned methods, with 8,9% of uncertainty with respect of the extreme values. The yearly fuel consumption for aviation sector is 13.6 Ml. For the emissions calculations we analyze four methods. We come to the conclusion that the activity induced method is the more appropriate with a total value of 8.8 TnCO2eq per year. We also compare the emissions of different transportation modes from Rosario to Buenos Aires with the aviation mode. The percentage difference of a diesel car is -98.69%, and for the train is -99,90%.Tema 7: Uso eficiente y racional de la energía. Políticas y economía energética.Facultad de Arquitectura y Urbanism

Blue compact dwarf galaxies with nitrogen overabundance: a view from integral field spectroscopy

This is an electronic version of the poster presented at the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held on September 13-17, 2010, in Madrid.The summary of the poster appears in Zapatero Osorio, M.R. et al. (eds.). Highlights of Spanish Astrophysics VI. Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held on September 13-17, 2010, in Madrid. Barcelona: Sociedad Española de Astronomía, 2011. 39