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- National ObservatoryBR59 papers
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6 papers · 1 filter
Interacting dark sector with quadratic coupling: theoretical and observational viability
Jaelsson S. Lima, Rodrigo von Marttens, Luciano Casarini
Models proposing a non-gravitational interaction between dark energy (DE) and dark matter (CDM) have been extensively studied as alternatives to the standard cosmological model. A…
NLP and Education: using semantic similarity to evaluate filled gaps in a large-scale Cloze test in the classroom
Túlio Sousa de Gois, Flávia Oliveira Freitas, Julian Tejada +1
This study examines the applicability of the Cloze test, a widely used tool for assessing text comprehension proficiency, while highlighting its challenges in large-scale implement…
Non-parametric reconstruction of the fine structure constant with galaxy clusters
Marcelo Ferreira, Rodrigo F. L. Holanda, Javier E. Gonzalez +2
Testing possible variations in fundamental constants of nature is a crucial endeavor in observational cosmology. This paper investigates potential cosmological variations in the fi…
Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
Fabio Wanderley, Katia Cunha, Oleg Kochukhov +10
Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology wa…
Random Apollonian networks with tailored clustering coefficient
Eduardo M. K. Souza, Guilherme M. A. Almeida
We introduce a family of complex networks that interpolates between the Apollonian network and its binary version, recently introduced in [Phys. Rev. E \textbf{107}, 024305 (2023)]…
Moduli space theory for complete, constant Q-curvature metrics on finitely punctured spheres
Rayssa Caju, Jesse Ratzkin, Almir Silva Santos
We study constant Q-curvature metrics conformal to the round metric on the sphere with finitely many point singularities. We show that the moduli space of solutions with finitely m…