A5087836149- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Ammonia Synthesis and Nitrogen Reduction
- Quantum Chromodynamics and Particle Interactions
- Quantum Electrodynamics and Casimir Effect
- Catalytic Processes in Materials Science
- HIV Research and Treatment
- Astrophysical Phenomena and Observations
- Particle physics theoretical and experimental studies
- Noncommutative and Quantum Gravity Theories
- Advancements in Solid Oxide Fuel Cells
- Malaria Research and Control
- vaccines and immunoinformatics approaches
- Advanced Mathematical Physics Problems
Universidade do Porto
2024
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2020-2023
University of Lisbon
2016-2023
Instituto Superior Técnico
2021-2022
We show that complex, massive spin-1 fields minimally coupled to Einstein's gravity with a negative cosmological constant, admit asymptotically anti--de Sitter self-gravitating solutions. Focusing on four-dimensional spacetimes, we start by obtaining analytical solutions in the test-field limit, where Proca field equations can be solved fixed background, and then find fully nonlinear numerically. These are natural extension of recently found flat stars share similar properties scalar boson...
Solid oxide fuel cells (SOFCs) offer a promising technology for clean and efficient power generation. In this study, an SOFC combining in-situ hydrogen generation from ammonia with nitrous reduction to nitrogen was simulated validated against experimental results the first time. Ammonia decomposition generates needed electroreduction of oxide, simultaneous electrical power. Nickel considered as anode catalyst since it is highly active decomposition. Perovskite LSCF - lanthanum strontium...
Abstract The dual-frame formalism leads to an approach extend numerical relativity simulations in generalized harmonic gauge (GHG) all the way null infinity. A major setback is that without care, even simple choices of initial data give rise logarithmically divergent terms would result irregular variables and equations on compactified domain, which turn prevent accurate approximation. It has been shown, however, a suitable choice constraint addition can be used their appearance. Presently we...
It is shown that a large class of systems non-linear wave equations, based on the good-bad-ugly model, admit formal solutions with polyhomogeneous expansions near null infinity. A particular set variables introduced which allows us to write Einstein field equations in generalized harmonic gauge as system and functional form first few orders such an expansion found by applying aforementioned result. Exploiting these metric components, peeling property Weyl tensor revisited. The question...
A system of equations that serves as a model for the Einstein field equation in generalised harmonic gauge called good-bad-ugly is studied region close to null and spatial infinity Minkowski spacetime. This analysis performed using H. Friedrich's cylinder construction at defining suitable conformally rescaled fields. The results are translated physical set up investigate relation between polyhomogeneous expansions arising from linear fields $i^0$-cylinder framework those obtained through...
Abstract Two malaria parasite species, Plasmodium falciparum ( Pf ) and P. vivax Pv are responsible for most of the disease burden caused by malaria. Vaccine development against this has focused mainly on . Whole-sporozoite (WSp) vaccination, targeting pre-erythrocytic (PE) stages, is a promising strategy immunization several WSp-based vaccine candidates currently undergoing clinical evaluation. In contrast, no WSp have been developed , due to constraints in production sporozoites...
A heuristic method to find asymptotic solutions a system of non-linear wave equations near null infinity is proposed. The non-linearities in this model, dubbed good-bad-ugly, are known mimic the ones present Einstein field (EFE) and we expect be able exploit derive an expansion for metric General Relativity (GR) close that goes beyond first order as performed by Lindblad Rodnianski leading asymptotics. For good-bad-ugly formal expansions which terms proportional logarithm radial coordinate...
For mathematical convenience initial data sets in numerical relativity are often taken to be conformally flat.Employing the dual-foliation formalism, we investigate physical consequences of this assumption.Working within a large class asymptotically flat spacetimes show that ADM linear momentum is governed by leading Lorentz part boost even presence supertranslation-like terms.Following up, find flat, and admit spatial slices with vanishing sufficiently close conformal flatness, any boosted...
The dual-frame formalism leads to an approach extend numerical relativity simulations in generalized harmonic gauge (GHG) all the way null infinity. A major setback is that without care, even simple choices of initial data give rise logarithmically divergent terms would result irregular variables and equations on compactified domain, which turn prevent accurate approximation. It has been shown, however, a suitable choice constraint addition can be used their appearance. Presently we first...
A system of equations that serves as a model for the Einstein field equation in generalised harmonic gauge called good-bad-ugly is studied region close to null and spatial infinity Minkowski spacetime. This analysis performed using H. Friedrich's cylinder construction at defining suitable conformally rescaled fields. The results are translated physical set up investigate relation between polyhomogeneous expansions arising from linear fields $i^0$-cylinder framework those obtained through...