Kinks, Sistemas Integrables y Geodésicas: Solitones en el Modelo Sigma O(3) Lineal

[ES] En este trabajo se estudian las soluciones de tipo ondas solitaria o kinks de una deformación del Modelo Sigma O(N) Lineal que generaliza al caso de campos escalares reales el conocido modelo MSTB de dos campos. El metodo empleado es la Analogía Mecanica, es decir, la reinterpretacion de las ecuaciones de los campos, para las soluciones kink, como las ecuaciones de Newton de un sistema dinamico asociado. El sistema en estudio resulta ser completamente integrable ( en el sentido de Arnold-Lioville ) y ademas, la ecuación de Hamilton-Jacobi correspondiente es separable utilizable coordenadas elipticas de Jacobi N-dimensionales. Se han analizado con detalle las soluciones correspondientes al caso N=3, obteniendose una estructura rica del espacio de soluciones, susceptible de ser compactificado de varias formas diferentes, altamente no triviales. El estudio de la estabilidad de las soluciones kink es en general muy complicado e inabordable analiticamente pues se hace necesario calcular los espectros de operadores diferenciales matriciales. Se han desarrollado varias tecnicas para establecer la estabilidad o inestabilidad de las trayectorias solucion de un sistema dinamico con la estabilidad de las correspondientes geodesicas en la metricas de Jacobi asociada al mismo y que viene determinada por la ecuacion de desviación geodésica. La generalización al caso de espacios no localmente simetricos de las tecnicas de diagonalizacion de la curvetura seccional habituales en la literatura ha permitido tratar esta ecuacion y su problema espectral asociado, estableciendose de esta manera un criterio de estabilidad de tipo geometrico. Por otro lado, se ha demostrado el carácter pre-supersimetrico del modelo en estudio, calculandose una familia de superpotenciales validos para esta teoria. Ello ha permitido clasificar los kinks en kinks BPS y kinks no-BPS, identificandose los primeros como los unicos estables

A generalized Holling type II model for the interaction between dextral-sinistral snails and Pareas snakes

Producción CientíficaPareatic snakes possess outstanding asymmetry in the mandibular tooth number, which has probably been caused by its evolution to improve the feeding on the predominant dextral snails. Gene mutation can generate chiral inversion on the snail body. A sinistral snail population can thrive in this ecological context. The interactions between dextral/sinistral snails and Pareas snakes are modeled in this paper by using a new generalized functional response of Holling type II. Distinct Pareas species show different bilateral asymmetry degrees. This parameter plays an essential role in our model and determines the evolution of the populations. Stability of the solutions is also analyzed for different regimes in the space of parameters.Ministerio de Economía, Industria y Competitividad (grant MTM2014-57129-C2-1-P)Junta de Castilla y Leon (grant VA057U16

Coherently manipulating flying qubits in a quantum wire with a magnetic impurity

e study the effect of a magnetic impurity with spin-half on a single propagating electron in a one-dimensional model system via the tight-binding approach. Due to the spin-dependent interaction, the scattering channel for the flying qubit is split, and its transmission spectrum is obtained. It is found that, the spin orientation of the impurity plays the role as a spin state filter for a flying qubit.Comment: 6 pages, 5 figure

Domain walls in a non-linear 2-sigma model with homogeneous quartic polynomial potential

[EN] In this paper the domain wall solutions of a Ginzburg-Landau non-linear 2-sigma hybrid model are exactly calculated. There exist two types of basic domain walls and two families of composite domain walls. The domain wall solutions have been identified by using a Bogomolny arrangement in a system of sphero-conical coordinates on the sphere 2. The stability of all the domain walls is also investigated

Domain walls in a non-linear S2-sigma model with homogeneous quartic polynomial potential

In this paper the domain wall solutions of a Ginzburg-Landau non-linear S2-sigma hybrid model are exactly calculated. There exist two types of basic domain walls and two families of composite domain walls. The domain wall solutions have been identified by using a Bogomolny arrangement in a system of sphero-conical coordinates on the sphere S2. The stability of all the domain walls is also investigated

Thermodynamics and criticality of supersymmetric spin chains with long-range interactions

We study the thermodynamics and critical behavior of su(m|n) supersymmetric spin chains of Haldane-Shastry type with a chemical potential term. We obtain a closed-form expression for the partition function and deduce a description of the spectrum in terms of the supersymmetric version of Haldane's motifs, which we apply to obtain an analytic expression for the free energy per site in the thermodynamic limit. By studying the low-temperature behavior of the free energy, we characterize the critical behavior of the chains with 1 <= m, n <= 2, determining the critical regions and the corresponding central charge. We also show that in the su(2|1), su(1| 2) and su(2| 2) chains the bosonic or fermionic densities can undergo first-order ( discontinuous) phase transitions at T = 0, in contrast with the previously studied su(2) case

Kinks from dynamical systems: domain walls in a deformed O(N) linear sigma model

Preprint[EN]It is shown how an integrable mechanical system provides all the localized static solutions of a deformation of the linear O(N)-sigma model in two spacetime dimensions. The proof is based on the Hamilton-Jacobi separability of the mechanical analogue system that follows when time-independent field configurations are being considered. In particular, we describe the properties of the different kinds of kinks in such a way that a hierarchical structure of solitary wave manifolds emerges for distinct N. [ES] Se muestra cómo un sistema mecánico integrable proporciona todas las soluciones estáticas localizadas de una deformación del modelo lineal O(N)-sigma en dos dimensiones espaciales. La prueba se basa en la capacidad de separación de Hamilton-Jacobi del sistema mecánico análogo que sigue cuando se consideran las configuraciones del campo tiempo-independiente. En particular, se describen las propiedades de los diferentes tipos de deformaciones de los Kinks, de tal manera que una estructura jerárquica de colectores de onda solitaria emerge de distinta N

Invariants in supersymmetric classical mechanics

Preprint[EN] The bosonic second invariant of SuperLiouville models in supersymmetric classical mechanics is described. [ES] El segundo campo cuántico de bosones invariante del modelo SuperLiouville es descrito en la mecanica clasica supersimétrica

Elementary solutions of the quantum planar two-center problem

Física Teórica, Atómica y Óptic