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Browsing Investigación by Author "García Ramos, José Enrique"
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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 twolevel model that involves pairing and monopole–monopole interactions. It is, therefore, an extension of the well known Lipkin–Meshkov–Glick model (Lipkin ... 
Carbon emissions, energy consumption and sustainable development in Ecuador (19802025) : system dynamics modelling, decomposition analysis and the Environmental Kuznets Curve
Robalino López, Andrés (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 ... 
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 midshell N = 104 region. ... 
Continuous unitary transformations in twolevel boson systems
Dusuel, Sébastien; Vidal, Julien; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20051230)Twolevel 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, 201205)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, 20081216)We analyze the decoherence induced on a single qubit by the interaction with a twolevel 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 twolevel boson model
Pérez Fernández, Pedro; Relaño Pérez, Armando; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20090917)The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar twolevel boson system that can go through either firstorder or continuousexcitedstate ... 
Deformation and mixing of coexisting shapes in neutrondeficient polonium isotopes
Kesteloot, N.; García Ramos, José Enrique; Zielińska, M. (American Physical Society, 2015)Coulombexcitation experiments are performed with postaccelerated beams of neutrondeficient Po196,198,200,202 isotopes at the REXISOLDE facility. A set of matrix elements, coupling the lowlying states in these isotopes, ... 
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 protonneutron interacting boson model (IBM2). Previous studies [1,2,3] were based on numerical solutions. We ... 
Disentangling the nuclear shape coexistence in eveneven 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 eveneven Hg isotopes, 172−200Hg, using the interacting boson model including configuration mixing. We pay special attention to the description of the shape of the ... 
Economic growth, renewable energy and CO2 emissions: the Kaya identity and the environmental Kuznets curve
García Ramos, José Enrique; Golpe Moya, Antonio Aníbal; Mena Nieto, Ángel Isidro; Robalino López, Andrés (201507)This contribution presents a model for estimating CO2 emissions in a given country for a near future. The model is based on a modification of the Kaya identity that allows to connect gross domestic product, productive ... 
Excited state quantum phase transitions and chaos in the Dicke model
Pérez Fernández, Pedro; Relaño Pérez, Armando; Cejnar, P.; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Institute of Physics, 2012)In this contribution, the critical behavior of excited state quantum phase transitions (ESQPT’s) and its relation to order and chaos in the Dicke model are studied. This model is nonintegrable. For comparison, the same ... 
Excitedstate phase transition and onset of chaos in quantum optical models
Pérez Fernández, Pedro; Relaño Pérez, Armando; Arias Carrasco, José Miguel; Cejnar, P.; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20110415)We study critical behavior of excited states and its relation to order and chaos in the Jaynes Cummings and Dicke models of quantum optics. We show that both models exhibit a chain of excitedstate quantum phase transitions ... 
Excitedstate quantum phase transitions in a twofluid Lipkin model
García Ramos, José Enrique; Pérez Fernández, Pedro; Arias Carrasco, José Miguel (American Physical Society, 2017)[Background:] Composed systems have became of great interest in the framework of the ground state quantum phase transitions (QPTs) and many of their properties have been studied in detail. However, in these systems ... 
Finitesize corrections in the bosonic algebraic approach to twodimensional systems
Pérez Fernández, Pedro; Arias Carrasco, José Miguel; García Ramos, José Enrique; Pérez Bernal, Francisco (American Physical Society, 20110630)Analytical results beyond the meanfieldlimit approximation for several observables of the twodimensional limit of the vibron model are presented. Finitesize scaling exponent values are also analytically derived. The ... 
The influence of intruder states in eveneven Po isotopes
García Ramos, José Enrique; Heyde, K. (20150923)We study the role of intruder states and shape coexistence in the eveneven Po isotopes, through an interacting boson model with configuration mixing calculation. We analyzed the results in the light of known systematics ... 
The interacting boson model with SU(3) charge symmetry and its application to even–even N≈Z nuclei
García Ramos, José Enrique; Van Isacker, P. (Elsevier, 1999)The isospininvariant interacting boson model IBM3 is analyzed in situations where SUT (3) charge symmetry [or, equivalently, UL(6) sd symmetry] is conserved. Analytic expressions for energies, electromagnetic ...