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Encuentros sobre Fronteras de la Ciencia 2024

 

Fronteras2024aFechas: 19-20 de septiembre de 2024 

Lugar: Facultad de Ciencias, Universidad de Salamanca

web: https://fronteras.usal.es/

El Encuentro sobre Fronteras de la Ciencia 2024 está organizado conjuntamente por las universidades de Salamanca (USAL) y de Valladolid (UVA) y cuenta con el apoyo de la Fundación Duques de Soria. Estos encuentros se llevan realizando desde 1999, alternando las sedes entre las universidades de Valladolid y Salamanca, con gran acogida de cada edición por parte de los estudiantes.

El objetivo de estos Encuentros es doble:

  • Por una parte, ofrecer un panorama de los avances y perspectivas de la física en el desarrollo tecnológico actual y sus aplicaciones más novedosas como las derivadas de la utilización de aceleradores deiones, o en campos tales como los materiales, la energía de origen nuclear (fusión), óptica moderna o microelectrónica.
  • Por otra, revisar el estado actual de temas de investigación básica que han sido siempre de interés en la física teórica: el Universo, las partículas elementales, las teorías de unificación, etc.

Se cuenta con profesionales de la investigación punteros en sus campos dentro de la Física moderna.

Fronteras2024bEn esta edición 2024 se ha incluido tanto la difusión de los estudios de máster relacionados con la Física de la UVA y la USAL, y la posibilidad de que los alumnos presenten en formato póster sus trabajos fin de grado y fin de máster, para darles también voz en las jornadas. Con ello se pretender implicar y motivar a un mayor número de estudiantes.

Se cuenta para este evento con la colaboración del Instituto de Física Fundamental y Matemáticas (IUFFyM) y a la Unidad de Excelencia en luz y materia estructurada (LUMES).


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Astrophysical solutions in the generalized SU(2) Proca theory

Seminar Title: Astrophysical solutions in the generalized SU(2) Proca theoryJahnNMartinezIUFFyM

Speaker: Jhan N. Martínez

Universidad Industrial de Santander
Date and time:  Thursday, July 18th, (12:30)
Room: Aula V  - Edificio trilingüe – Facultad de Ciencia – Universidad de Salamanca

Abstract: This talk will be divided into three pieces. In the first part of the talk, I will introduce the common ideas surrounding the modified gravity proposals starting from their main motivation: Einstein gravity, despite all its success on the observational side, is an effective theory. In the second part of the talk, I will present the generalized SU(2) Proca theory (GSU2P for short). As a modified gravity theory that introduces new gravitational degrees of freedom, the GSU2P is the non-Abelian version of the well known generalized Proca theory where the action is invariant under global transformations of the SU(2) group. This theory was formulated for the first time in Phys. Rev. D 94 (2016) 084041, having implemented the required primary constraint to make the Lagrangian degenerate and remove one degree of freedom from the vector field in accordance with the irreducible representations of the Poincaré group. It was later shown in Phys. Rev. D 101 (2020) 045009 that a secondary constraint, which trivializes for the generalized Proca theory but not for the SU(2) version, was needed to close the constraint algebra. The implementation of this secondary constraint in the GSU2P was performed in Phys. Rev. D 102 (2020) 104066 where, as a side effect, the construction of the theory was made more transparent. Since several terms in the Lagrangian were dismissed in Phys. Rev. D 94 (2016) 084041 via their equivalence to other terms through total derivatives, not all of the latter satisfying the secondary constraint, the work was not so simple as directly applying the secondary constraint to the resultant Lagrangian pieces of the old theory. Thus, my collaborators and I were motivated to reconstruct the theory from scratch. In the process, we found the beyond GSU2P. In the third part of the talk, I will show what the impact of the GSU2P is on the cosmic primordial inflation epoch and what its main challenges are.

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Modified gravity, generalized SU(2) Proca theory, and inflation – Yeinzon Rodríguez García

Title seminar: Modified gravity, generalized SU(2) Proca theory, and inflationYeinzonSeminarIUFFyM

Speaker: Yeinzon Rodríguez García

Date and time:  Tuesday, July 16th, (12:00)
Room: Aula V (Edifício Trilingüe) – Facultad de Ciencias – Universidad de Salamanca
Universidad Industrial de Santander, Universidad Antonio Nariño.Abstract: This talk will be divided into three pieces. In the first part of the talk, I will introduce the common ideas surrounding the modified gravity proposals starting from their main motivation: Einstein gravity, despite all its success on the observational side, is an effective theory. In the second part of the talk, I will present the generalized SU(2) Proca theory (GSU2P for short). As a modified gravity theory that introduces new gravitational degrees of freedom, the GSU2P is the non-Abelian version of the well known generalized Proca theory where the action is invariant under global transformations of the SU(2) group. This theory was formulated for the first time in Phys. Rev. D 94 (2016) 084041, having implemented the required primary constraint to make the Lagrangian degenerate and remove one degree of freedom from the vector field in accordance with the irreducible representations of the Poincaré group. It was later shown in Phys. Rev. D 101 (2020) 045009 that a secondary constraint, which trivializes for the generalized Proca theory but not for the SU(2) version, was needed to close the constraint algebra. The implementation of this secondary constraint in the GSU2P was performed in Phys. Rev. D 102 (2020) 104066 where, as a side effect, the construction of the theory was made more transparent. Since several terms in the Lagrangian were dismissed in Phys. Rev. D 94 (2016) 084041 via their equivalence to other terms through total derivatives, not all of the latter satisfying the secondary constraint, the work was not so simple as directly applying the secondary constraint to the resultant Lagrangian pieces of the old theory. Thus, my collaborators and I were motivated to reconstruct the theory from scratch. In the process, we found the beyond GSU2P. In the third part of the talk, I will show what the impact of the GSU2P is on the cosmic primordial inflation epoch and what its main challenges are.
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Flat Band Physics by Sergej Flach

Sergej_Flach_theoretical_physicist_2018 Esta semana tendremos un coloquio un tanto especial, que además será el último de este curso académico.
Este evento se enmarca en el contexto del “International Workshop on Disordered Systems 2024”, congreso organizando en Salamanca por miembros del IUFFyM y que cuenta con el apoyo económico del Instituto.
La charla tendrá lugar el jueves 20 a las 16:50 horas en la Capilla del Colegio Arzobispo Fonseca.
De 16:10 a 16.50 se servirá un coffee break en el claustro inferior del Colegio Fonseca, al que están invitados los miembros del IUFFyM.
El speaker del coloquio será Sergej Flach, que es actualmente director del IBS Center for Theoretical Physics of Complex Systems, South Korea, y líder del grupo on Complex Condensed Matter Systems en dicho instituto.
Os dejo los detalles más abajo, y adjunto además el anuncio del coloquio.
La dirección del IUFFyM agradece a los organizadores del congreso hacer partícipe al instituto de este coloquio. Os esperamos a todos allí.
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Flat Band Physics
Sergej Flach
IBS Center for Theoretical Physics of Complex Systems, South Korea
Certain lattice wave systems in translationally invariant settings have one or more spectral bands that are strictly flat (independent of momenta) in the tight binding approximation, arising from either internal symmetries or fine-tuned coupling. We will briefly touch on the theoretical design and experimental implementation of flat bands and classification schemes. We will then discuss the impact of disorder and interactions. We will observe quantum many body interacting systems embedded in flat band environments which lead to controlled currents of charge and heat, heat percolation, many body localization in translationally invariant systems, and interaction induced transport in Wannier-Stark flatbands.
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Pulsos de luz de attosegundos para el estudio de la dinámica de electrones

AnnaLHuillierEl próximo jueves 20 de junio a las 19:00h., l
a Dra. Anne L’Huillier (Premio Nobel de Física 2023)
impartirá en la Fundación Ramón Areces (c/ Vitruvio, 5. Madrid), la conferencia:
Es necesario hacer la inscripción online previa. También podrá seguirse a través del Canal de YouTubeRAC
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Suelos urbanos como objeto de investigación en Edafología

Este viernes 14 de junio a las 12.30 horas se celebra un nuevo Seminario en el

SeminarioSuelosSalón de Actos del IRNASA-CSIC (C/Cordel de Merinas s/n),

con acceso libre y gratuito hasta completar aforo,

a cargo del profesor de la Universidad de Santiago de Compostela Dr. Remigio Paradelo.

También será emitido en streaming a través del siguiente enlace: https://www.youtube.com/live/leQjumn73eo?si=sxRHuX6HoEDbgxFhA

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Transporte dinámico en el efecto Hall cuántico

EfectoHallCuanticoThis is the first announcement of the eight IUFFyM colloquium of the season next Thursday, June 13th

Transporte dinámico en el efecto Hall cuántico

C. Altimiras

SPEC, Université Paris-Saclay

Before the colloquium (12:30 – 13:00), some coffee and snacks will be offered as usual next to the pendulum to encourage the participation.

We hope to see you there!
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Experimental test of Kubo relation on a non-linear quantum conductor from energy exchanges

Experimental test of Kubo relation on a non-linear quantum conductor from energy exchangesNanoLab_NanoTech
Speaker Carles Altemiras (SPEC, Université Paris-Saclay, UMR3680 CEA – CNRS)
Date: 14/06/2024 
Place: aula I Edificio del Trilingüe (Facultad de Ciencias, Universidad de Salamanca) 11:00 a 12:00 h
Abstract:
We present an experimental test of Kubo formula on a non-linear quantum conductor, a Superconducting-Insulator-Superconducting tunnel junction, driven far from equilibrium by a dc voltage bias. Following the proposal of Lesovik & Loosen, we first demonstrate it is possible to extract both emission and absorption noise of the conductor by measuring the power it exchanges with a linear detection circuit whose population is tuned close to vacuum levels. We then compare their difference to the real part of the admittance, which is independently measured by coherent reflectometry, finding that Kubo relation holds within experimental accuracy.
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Characterization of Quantum Non-demolition Measurements of Superconducting Qubits

NanoLab_NanoTech 
Characterization of Quantum Non-demolition Measurements of Superconducting Qubits
Speaker: Tomás Ramos (CSIC QUINFOG Madrid)  https://quinfog.hbar.es/members/tomas-ramos/
Fecha, lugar y hora: 14/06/2024, aula I Edificio del Trilingüe (Facultad de Ciencias, Universidad de Salamanca) 10:00 a 11:00 h
Abstract:
The current generation of quantum machines can perform universal quantum logic operations, but the number of successive operations is limited by noise, imperfections, and decoherence. My work focuses on improving the quality of quantum measurement and amplification in superconducting circuits, which induces the largest errors at the moment (on order 1%). In this seminar, I will first review the standard procedure for dispersive qubit readout and then discuss new tomographic methods to experimentally reconstruct the complete quantum process behind a quantum non-demolition (QND) measurement [1,2]. This provides valuable information to identify measurement errors, and we show how to use this to improve the calibration of dispersive superconducting qubit, quantify more precisely the QNDness and back-action of the measurement, as well as to characterize multi-qubit parity measurements needed in quantum error correcting codes.
Organiser:
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Why do galaxy sizes matter? by Fernando Buitrago

Speaker: Fernando Buitrago (Universidad de Valladolid)Title: Why do galaxy sizes matter?

Abstract: During the last decades, galaxy sizes have been a very active research topic in Astrophysics given the fact that they are one of the few direct observables from objects in the distant Universe. In this seminar, I will review the different approaches that were traditionally taken, showing what we have learned about how our Universe works over time. However, galaxies are fuzzy objects, and as such it is very hard to assign sizes to them. One would naively think that by observing for larger integration times and/or by using better telescopes these objects will grow bigger and bigger. I will prove you wrong by describing a novel physically-motivated size proxy (the galaxy edges or galaxy truncations) that my team GEELSBE (Galactic Edges and Euclid in the Low Surface Brightness Era) at the University of Valladolid is studying. We have utilized the deepest pointings of the Hubble Space Telescope (while now using the James Webb Space Telescope and Machine Learning algorithms) to obtain the evolution of this parameter last 8 Gyr promising to give us first hand information not only about the baryonic mass assembly but also the dark matter halo evolution.

Date and time:  Wednesday, June 05, (13:00)gracus_logo2

Room: Aula V, Edificio Trilingüe, Facultad de Ciencias, Universidad de Salamanca

https://gracus.usal.es/seminar.php?id=84

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