Encontrados 33 documentos, a visualizar página 1 de 4
RÓMULO: polo agregador de divulgação de ciência e de Ciência Aberta
Pereira, Felipe Demígio Fernandes; Providência, Constança; Marinho, SuzianeSerá apresentado o programa que o RÓMULO UC tem desenvolvido desde o início do ano, mostrando como poderá desempenhar um papel importante na UC como entidade de apoio e promoção da Ciência Aberta (CA). Nesse sentido, está a ser transformado o website, tem sido feito um esforço de acolhimento de eventos de divulgação científica bastante diversificados, está a ser dado acesso aos nossos recursos educacionais itin...
Constraining a relativistic mean field model using neutron star mass–radius mea...
Huang, Chun; Raaijmakers, Geert; Watts, Anna L; Tolos, Laura; Providência, ConstançaMeasurements of neutron star mass and radius or tidal deformability deliver unique insight into the equation of state (EOS) of cold dense matter. EOS inference is very often done using generalized parametric or non-parametric models, which deliver no information on composition. In this paper, we consider a microscopic nuclear EOS model based on a field theoretical approach. We show that current measurements fro...
Spanning the full range of neutron star properties within a microscopic descrip...
Malik, Tuhin; Ferreira, Márcio; Albino, Milena Bastos; Providência, ConstançaThere are 17 pages, 16 figures (The typographical error in the supplemental update); The high-density behavior of nuclear matter is analyzed within a relativistic mean-field description with non-linear meson interactions. To assess the model parameters and their output, a Bayesian inference technique is used. The Bayesian setup is limited only by a few nuclear saturation properties, the neutron star maximum mas...
Robust universal relations in neutron star asteroseismology
Kumar, Deepak; Malik, Tuhin; Mishra, Hiranmaya; Providência, ConstançaThe nonradial oscillations of the neutron stars (NSs) have been suggested as an useful tool to probe the composition of neutron star matter (NSM). With this scope in mind, we consider a large number of equations of states (EOSs) that are consistent with nuclear matter properties and pure neutron matter EOS based on a chiral effective field theory (chEFT) calculation for the low densities and perturbative QCD EO...
Decoding Neutron Star Observations: Revealing Composition through Bayesian Neur...
Carvalho, Valéria; Ferreira, Márcio; Malik, Tuhin; Providência, Constança16 pages, 15 figures, published version; We exploit the great potential offered by Bayesian Neural Networks (BNNs) to directly decipher the internal composition of neutron stars (NSs) based on their macroscopic properties. By analyzing a set of simulated observations, namely NS radius and tidal deformability, we leverage BNNs as effective tools for inferring the proton fraction and sound speed within NS interio...
The Effects of Self-interacting Bosonic Dark Matter on Neutron Star Properties
Giangrandi, Edoardo; Sagun, Violetta V.; Ivanytskyi, Oleksii; Providência, Constança; Dietrich, TimWe propose a model of asymmetric bosonic dark matter (DM) with self-repulsion. By adopting the two-fluid formalism, we study different DM distribution regimes, either, fully condensed inside the core of a star, or, otherwise, distributed in a dilute halo around a neutron star (NS). We show that for a given total gravitational mass, DM condensed in a core leads to a smaller radius and tidal deformability compare...
Non-strange quark stars within resummed QCD
Restrepo, Tulio E.; Providência, Constança; Pinto, Marcus Benghi13 pages, 5 figures, 2 tables; The recently developed resummation technique known as {\it renormalization group optimized perturbation theory} (RGOPT) is employed in the evaluation of the EoS describing non-strange cold quark matter at NLO. Inspired by recent investigations, which suggest that stable quark matter can be made only of up and down quarks, the mass-radius relation for two flavor pure quark stars is...
Hybrid stars with large strange quark cores constrained by GW170817
Ferreira, Márcio; Pereira, Renan Câmara; Providência, Constança12 pages, 8 figures; matches the published version; We analyze the impact of several multi-quark interaction channels on the properties of hybrid stars. Four and eight vector interactions were included in the $SU(3)$ NJL model to describe the quark matter, and all vector like interactions were investigated. The hybrid stars were built starting from an hadronic EoS that satisfy presently accepted nuclear matter ...
Light hyperclusters and hyperons in low-density hot stellar matter
Custódio, Tiago; Pais, Helena; Providência, Constança12 pages, 8 figures; The abundance of light nuclei and hyperons, that are produced in stellar environments such as supernova or binary mergers, is calculated within a relativistic mean-field model with density dependent couplings in low-density matter. Five light nuclei are considered, together with three light hyper-nuclei. We show that the presence of hyperons shifts the dissolution of clusters to larger dens...
I Mini-Olimpíadas Experimentais de Ciência.
Oliveira, Filipa; Carvalho, Maria Paula; Novais, Anabela; Mendes, Cristiana; Abrantes, I.; Gama, Ricardo; Abreu, Maria Conceição; Aibéo, AlexandreAs Olimpíadas de Ciência têm o potencial de divulgar a ciência e motivar os alunos para a mesma, estimular a construção do conhecimento científico e promover o desenvolvimento de novas metodologias em contexto escolar de 1.º Ciclo do Ensino Básico (CEB), bem como identificar indicadores relevantes na Educação em Ciências (Oliveira, & Paixão, 2018). Neste sentido, foi concebido um estudo piloto para implementar,...