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Revista Brasileira De Ensino De Fisica, 2023 Nesse artigo, apresentamos vários paradoxos aparentes da relatividade restrita e suas respectivas soluções. Esse paradoxos aparecem desde o advento da relatividade, em 1905, e de fato nunca são paradoxos. Do ponto de vista didático, os paradoxos são uma excelente ferramenta de aprendizado.
G. Alencar +3 more
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Neo-Newtonian cosmology: An intermediate step towards General Relativity [PDF]
Revista Brasileira de Ensino de Física, 2012 Cosmology is a field of physics in which the use of General Relativity theory is indispensable. However, a cosmology based on Newtonian gravity theory for gravity is possible in certain circumstances.
Bondi H. +37 more
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O Eclipse da Relatividade [PDF]
Revista De Ciência Elementar, 2019 Luís Tirapicos, Nuno Crato
exaly +2 more sources
Teoria da Relatividade Geral [PDF]
Revista De Ciência Elementar, 2017 Orfeu Bertolami, Cláudio Gomes
exaly +2 more sources
Topology and Fragility in Cosmology [PDF]
, 1997 We introduce the notion of topological fragility and briefly discuss some examples from the literature. An important example of this type of fragility is the way globally anisotropic Bianchi V generalisations of the FLRW $k=-1$ model result in a radical ...
A. A. Coley +33 more
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Hojas de El Bosque, 2021 En noviembre de este año, la famosa teoría de la relatividad general de Einstein cumple su primer centenario. En el siguiente texto el profesor Carlos Cartagena Marín nos ofrece un instructivo recorrido por algunos postulados y predicciones de esta apasionante teoría, que cambió de forma radical nuestras concepciones acerca del universo.
openaire +2 more sources
Removing black-hole singularities with nonlinear electrodynamics
, 2011 We propose a way to remove black hole singularities by using a particular nonlinear electrodynamics Lagrangian that has been recently used in various astrophysics and cosmological frameworks. In particular, we adapt the cosmological analysis discussed in
Birkhoff G. D. +6 more
core +1 more source
Bardeen-Petterson effect and the disk structure of the Seyfert galaxy NGC 1068 [PDF]
, 2005 VLBA high spatial resolution observations of the disk structure of the active galactic nucleus NGC 1068 has recently revealed that the kinematics and geometry of this AGN is well characterized by an outer disk of H2O maser emission having a compact ...
Abramowicz M. +9 more
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A Teoria da Relatividade em Portugal (1910-1940) [PDF]
, 2012 No Portugal do período entre guerras a Teoria da Relatividade não passou despercebida e foi alvo de referência e de alguma reflexão, tendo sido tema de relatórios académicos, cursos universitários, comunicações a congressos e ainda de alguns, escassos ...
Fitas, Augusto José dos Santos
core
Inflation from R^2 gravity: a new approach using nonlinear electrodynamics
, 2010 We discuss another approach regarding the inflation from the R^2 theory of gravity originally proposed by Starobinski. A non-singular early cosmology is proposed, where, adding a nonlinear electrodynamics Lagrangian to the high-order action, a bouncing ...
Acernese +41 more
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