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Aspects of topological solitons in relation to condensed matter, confinement and holography Imprimir
Gianni Tallarita
Facultad de Artes Liberales
Universidad Adolfo Ibañez

Viernes 6 de mayo, 16:15
Sala de seminarios, 3er piso
Departamento de Física, FCFM
Av. Blanco Encalada 2008

We consider distinct cases of solitons with orientational moduli coming from a particularly simple initial model inspired by Witten’s cosmic strings. We show that from these models one can construct solitonic solutions with interesting consequences. Finally, we extend the construction towards strong coupling using holographic techniques.
 

Seminarios Anteriores

Vortices escondidos Imprimir
Marcel Clerc,
Departamento de Física
FCFM, Universidad de Chile

Viernes 29 de abril, 16:15
Sala de seminarios, 3er piso
Departamento de Física, FCFM
Av. Blanco Encalada 2008

Mediante el envío de un haz de luz en una celda de cristal líquido nemático homeotrópica sometido a una tensión con una pared fotosensible un vórtice materia estable puede ser inducida en el centro de la muestra. Cuando se reduce el voltaje aplicado el vórtice desaparece de la región iluminada, sin embargo, el sistema muestra una textura molecular estacionaria. Sobre la base de una ecuación de amplitud de Ginzburg-Landau forzada mostramos que el vórtice con un núcleo de amplitud exponencialmente suprimido siempre permanece en una región debajo de la sombra umbral de la inestabilidad, y que la textura observado es inducido por su distribución de fase. Este es un nuevo tipo de soluciones de singularidad de fase tipo vórtice. Las simulaciones numéricas y observaciones experimentales muestran un acuerdo bastante adecuado.
 
Large-scale modeling of CO2 storage Imprimir
Jan M. Nordbotten
University of Bergen

Viernes 22 de abril, 16:15
Sala Seminarios 3er piso, DFI
Av Blanco Encalada 2008

Computer simulations are considered indispensable tools in subsurface analysis spanning applications from enhanced oil recovery to groundwater remediation. In both regulation and operation of geological CO2 storage, computer models are likewise a central tool. However, while the subsurface environment shares similarities between the applications, key differences require careful attention.

A prevailing issue in modeling and simulation of the subsurface is the trade-offs between a) physical complexity, b) geological detail, c) simulation domain size, and d) computational accuracy. Limited available resources prohibit a full inclusion of all four aspects, necessitating application-specific prioritizations. As an example, CO2 storage places a higher premium on domain size, both in space and time, than other subsurface applications. The choice of mathematical and physical models, as well as the corresponding simulation strategies, must reflect these priorities.

In this talk, we will highlight the novel challenges arising in computer simulation of geological CO2 storage, and consider some of the recent developments to overcome said challenges. 
 
Precession resonance mechanism in nonlinear wave systems Imprimir
Miguel Bustamante
Complex and Adaptive Systems Laboratory
School of Mathematics and Statistics
University College Dublin

Viernes 11 de marzo, 16:15
Sala Seminarios 3er piso, DFI
Av Blanco Encalada 2008

Discovered by Bustamante et al. in 2014 and published in Phys. Rev. Lett. in the same year, precession resonance is a mechanism whereby strong nonlinear energy transfers occur between modes of oscillations whose linear frequencies are detuned: the amplitude-dependent precession frequencies of the phases help restore the resonance, hence the name "precession resonance". After explaining how this mechanism works and how robust it is, we will discuss our long-term program that consists of finding applications of this effect in systems of technological interest, including gravity water waves in oceans, Rossby waves in the atmosphere, plasmas and nonlinear optics.
 
Dark Energy: Evidence and Future Prospects Imprimir
Ignacy Sawicki
University of Geneva
Switzerland 

Viernes 15 de enero, 16:15
Sala Seminarios 3er piso, DFI
Av Blanco Encalada 2008

I will review the ever-stronger observational evidence for the late-time acceleration of the expansion of the universe obtained from observations of the cosmic microwave background by the Planck satellite and the increasingly wide galaxy surveys. The data are grossly compatible with a cosmological constant, but increasingly there are hints that there are some anomalies. I will discuss how we intend to understand what is happening with the next generation of cosmological surveys.
 
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