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Browsing by Author "García Ramos, José Enrique"
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A digital quantum simulation of the Agassi model
Pérez Fernández, Pedro; Arias Carrasco, José Miguel; García Ramos, José Enrique
; Lamata, Lucas (2022)
A digital quantum simulation of the Agassi model from nuclear physics is proposed and analyzed. The proposal is worked out for the case with four different sites. Numerical simulations and analytical estimations are presented ... -
An extended Agassi model: algebraic structure, phase diagram, and large size limit
García Ramos, José Enrique; Dukelsky, J.; Pérez Fernández, Pedro (IOP Publishing, 2019)
The Agassi model (Agassi 1968 Nucl. Phys. A 116 49) is a schematic two-level model that involves pairing and monopole–monopole interactions. It is, therefore, an extension of the well known Lipkin–Meshkov–Glick model (Lipkin ... -
An study of the driving forces of CO2 emissions in the member states of the European Union (EU-28)
An study of the driving forces of CO2 emissions in the member states of the European Union (EU-28) -
Application of the data envelopment analysis technique to measure the environmental efficiency of the 27 countries of the European Union during the period 2012-2020
Cámara Aceituno, Juan; Hermoso Orzáez, Manuel Jesús; Terrados Cepeda, Julio; Mena Nieto, Ángel Isidro; García Ramos, José Enrique (Springer Science and Business Media LLC., 2023-06)
In the last decade, we have experienced a changing geopolitical context that has caused changes in the energy context. In addition, human activity contributes to global warming or sea level rising, i.e., climate change. A ... -
Carbon emissions, energy consumption and sustainable development in Ecuador (1980-2025) : system dynamics modelling, decomposition analysis and the Environmental Kuznets Curve
(Universidad de Huelva, 2014)The consumption of energy and carbon emissions related income growths are a development challenge requiring analysis and policy insights. Several analysis of future change in economies relies on quantitative point ... -
Charla-Coloquio 7ª Semana Internacional del Acceso Abierto
García Ramos, José Enrique; Feria Lorenzo, Diego José; Villadóniga Gómez, José Carlos; Morillo Moreno, José Carlos; Cívico Martín, Rafaela (Universidad de Huelva, 2013-10-24)
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CO2 emissions and causal relationships in the six largest world emitters
Ortega Ruiz, Gregorio; Mena Nieto, Ángel Isidro; Golpe Moya, Antonio Aníbal; García Ramos, José Enrique (2022)
This paper aims to analyse and compare the driving forces of the carbon dioxide emissions of the six highest emitters of the world, namely, China, the United States of America, the European Union, India, Russia, and Japan, ... -
CO2 emissions convergence among 10 South American countries : a study of Kaya components (1980–2010)
Robalino López, Andrés; García Ramos, José Enrique; Golpe Moya, Antonio Aníbal; Mena Nieto, Ángel Isidro (Taylor and Francis, 2016)
This paper analyzes the convergence process in CO2 emissions per capita among 10 South American countries from 1980 to 2010 based on their Kaya components, namely, gross domestic product (GDP) per capita, energy intensity ... -
Concealed configuration mixing and shape coexistence in the platinum nuclei
García Ramos, José Enrique; Hellemans, V.; Heyde, K. (American Institute of Physics, 2012)
The role of configuration mixing in the Pt region is investigated. The nature of the ground state changes smoothly, being spherical around mass A 174 and A 192 and deformed around the mid-shell N = 104 region. ... -
Continuous unitary transformations in two-level boson systems
Dusuel, Sébastien; Vidal, Julien; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 2005-12-30)
Two-level boson systems displaying a quantum phase transition from a spherical (symmetric) to a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with O(2L + 1) symmetry for large number of ... -
Decoherence and quantum quench: their relationship with excited state quantum phase transitions
García Ramos, José Enrique; Arias Carrasco, José Miguel; Cejnar, P.; Dukelsky, J.; Pérez Fernández, Pedro; Relaño Pérez, Armando (American Institute of Physics, 2012-05)
We study the similarities and differences between the phenomena of Quantum Decoherence and Quantum Quench in presence of an Excited State Quantum Phase Transition (ESQPT).We analyze, on one hand, the decoherence induced ... -
Decoherence as a signature of an excited state quantum phase transition
Relaño Pérez, Armando; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique; Pérez Fernández, Pedro (American Physical Society, 2008-12-16)
We analyze the decoherence induced on a single qubit by the interaction with a two-level boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase ... -
Decoherence due to an excited state quantum phase transition in a two-level boson model
Pérez Fernández, Pedro; Relaño Pérez, Armando; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 2009-09-17)
The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar two-level boson system that can go through either first-order or continuous-excited-state ... -
Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes
Kesteloot, N.; García Ramos, José Enrique; Zielińska, M. (American Physical Society, 2015)
Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po196,198,200,202 isotopes at the REX-ISOLDE facility. A set of matrix elements, coupling the low-lying states in these isotopes, ... -
Desarrollo de un modelo predictivo de las emisiones de CO2, el consumo energético y el desarrollo sostenible en India 1990-2030
(Universidad de Huelva, 2022)Esta tesis tiene como objetivo principal analizar y comparar las fuerzas motrices que conforman las emisiones de dióxido de carbono en India, dada la especial relevancia mundial que se prevé tendrán dichas emisiones. Para ... -
Digital quantum simulation of an extended Agassi model: Using machine learning to disentangle its phase-diagram
Sáiz, Álvaro; García Ramos, José Enrique; Arias Carrasco, José Miguel; Lamata, Lucas; Pérez Fernández, Pedro (American Physical Society, 2022)
A digital quantum simulation for the extended Agassi model is proposed using a quantum platform with eight trapped ions. The extended Agassi model is an analytically solvable model including both short range pairing and ... -
Disentangling phase transitions and critical points in the proton–neutron interacting boson model by catastrophe theory
García Ramos, José Enrique; Arias Carrasco, José Miguel; Dukelsky, J. (Elsevier, 2014)
We introduce the basic concepts of catastrophe theory needed to derive analytically the phase diagram of the proton-neutron interacting boson model (IBM-2). Previous studies [1,2,3] were based on numerical solutions. We ... -
Disentangling the nuclear shape coexistence in even-even Hg isotopes using the interacting boson model
García Ramos, José Enrique; Heyde, K. (EDP Sciences, 2015)
We intend to provide a consistent description of the even-even Hg isotopes, 172−200Hg, using the interacting boson model including configuration mixing. We pay special attention to the description of the shape of the ...
