Ciclo de charlas bimestrales de estudiantes de doctorado
📅 Viernes 24 de octubre de 2025
🕚 11:00 h
📍 Seminario, 5ª planta
Te invitamos a una nueva edición de B&Sci, el ciclo de charlas donde estudiantes de doctorado presentan sus investigaciones en curso. En esta ocasión, contaremos con tres ponencias que abordan temas punteros en física teórica, computacional y aplicada:
- Antonio de la Misericordia Sojo López
Optimal Planification of Tasks: A generalization of the Travelling Salesman Problem
- Miguel Galocha Oliva
Developing a new computational open-source tool for calculations in ion Microdosimetry
- Mario Misas Arcos
Time evolution of relativistic systems: dissecting a spacetime
📄 Resumen de las charlas
Optimal Planification of Tasks: A generalization of the Travelling Salesman Problem
Antonio de la Misericordia Sojo López
In this talk we address a generalization of the Travelling Salesman Problem that can be used to model very general problems involving a list of tasks that needs to be optimally completed by a team of workers with respect to an arbitrary metric. In order to construct such theory we use introductory level graph theory, mixed integer linear programming and combinatorics.
Within the applications of this generalization, we find optimal planification of a swarm of Unmanned Aerial Vehicles (UAVs) that is required to inspect a certain region of space, the optimal route for a turistic trip to a city, the optimal assembly of parts in assembly lines or our day to day routine and many other applications that needed very specific models to be solved.
Original paper on which this talk is based on: https://arxiv.org/abs/2410.20849
Developing a new computational open-source tool for calculations in ion Microdosimetry
Miguel Galocha Oliva, con A. Baratto-Roldán y M.A. Cortés-Giraldo
The spatial distribution of energy deposition events produced by ionizing radiation is a key factor in determining their induced effects at the cellular scale. Microdosimetry provides a robust theoretical framework based on stochastic quantities, which are used to assess the relative biological effectiveness (RBE) of ion beams. These quantities, such as lineal energy, and their distributions are commonly evaluated through Monte Carlo simulations.
In this work we present Microtrack, the new Geant4-DNA example for calculating microdosimetric quantities in the context of ion therapy. This new computational tool allows the study of energy deposition in spherical sensitive volumes (“sites”), ranging from nanometers to micrometers in diameter, randomly sampled within a homogeneous medium and fulfilling charged-particle equilibrium for secondary electrons in the volume of study. The primary generator class allows the user to control the particle kind and energy and the source position, enabling the reproducibility of common setups for Microdosimetry and radiobiological studies. A dedicated sensitive detector is created for recording step-by-step interactions and producing event-level observables. From these observables, microdosimetric quantities such as lineal energy, directly relevant to radiobiological modeling, are derived. These results are stored in a ROOT file generated by the application once the simulation is finished.
In summary, Microtrack is an open-source computational tool for Monte Carlo calculations of the distributions of microdosimetric quantities resulting from ion track segments.
Time evolution of relativistic systems: dissecting a spacetime
Mario Misas Arcos
In classical dynamics, physical systems are often described as a combination of some initial data and a time-evolution equation that predicts the system's behaviour. However, in general relativity, systems obey the Einstein's 4-dimensional field equations. Not only does this defy our intuition, but it also hinders numerous potential numerical treatments of the equations. Nonetheless, it is indeed possible to pose the time-evolution of a gravitational field in general relativity in terms of a traditional initial value problem o “Cauchy” problem, through the so-called "3+1 decomposition" of spacetime. In this talk, we will briefly review how this is performed, delving into its key differences with the traditional 4-dimensional formulation of general relativity, and emphasizing on its relevance within the field of numerical relativity.