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pro vyhledávání: '"Pereira, J. G."'
The spacetime short-distance structure at the Planck scale is governed by the Planck length, usually interpreted as a three-dimensional Euclidian length. As such, it is not Lorentz invariant and clashes with Einstein's special relativity, which is th
Externí odkaz:
http://arxiv.org/abs/2203.04824
Autor:
Pereira, J. G., López, D. F.
Publikováno v:
Universe 6 (2020) 243
General relativity has two fundamental problems that render it unsuitable for tackling the gravitational field's quantization. The first problem is the lack of a genuine gravitational variable representing gravitation only, inertial forces apart. The
Externí odkaz:
http://arxiv.org/abs/2012.09075
Autor:
Pereira, J. G., Obukhov, Y. N.
Publikováno v:
Universe 5 (2019) 139
During the conference "Teleparallel Universes in Salamanca", we became aware of a recent paper [M. Fontanini, E. Huguet, and M. Le Delliou, Phys. Rev. D 99 (2019) 064006] in which some criticisms on the interpretation of teleparallel gravity as a gau
Externí odkaz:
http://arxiv.org/abs/1906.06287
Publikováno v:
Class.Quant.Grav. 36 (2019) no.18, 183001
Teleparallel gravity and its popular generalization $f(T)$ gravity can be formulated as fully invariant (under both coordinate transformations and local Lorentz transformations) theories of gravity. Several misconceptions about teleparallel gravity a
Externí odkaz:
http://arxiv.org/abs/1810.12932
Publikováno v:
Grav. Cosm. 25 (2019) 157-163
Owing to the existence of an invariant length at the Planck scale, Einstein special relativity breaks down at that scale. A possible solution to this problem is arguably to replace the Poincar\'e invariant Einstein special relativity by a de Sitter i
Externí odkaz:
http://arxiv.org/abs/1706.06443
Publikováno v:
Class. Quantum Grav. 34 (2017) 115014
The replacement of the Poincar\'e-invariant Einstein special relativity by a de Sitter-invariant special relativity produces concomitant changes in all relativistic theories, including general relativity. A crucial change in the latter is that both t
Externí odkaz:
http://arxiv.org/abs/1704.02120
Autor:
Araujo, A., Pereira, J. G.
Publikováno v:
Int. J. Mod. Phys. D 24 (2015) 1550099 (12 pages)
As quotient spaces, Minkowski and de Sitter are fundamental spacetimes in the sense that they are known "a priori", independently of Einstein equation. They represent different non-gravitational backgrounds for the construction of physical theories.
Externí odkaz:
http://arxiv.org/abs/1506.06948
Autor:
Aldrovandi, R., Pereira, J. G.
Publikováno v:
Ciencia Hoje 55 (2015) 32
At the time it celebrates one century of existence, general relativity---Einstein's theory for gravitation---is given a companion theory: the so-called teleparallel gravity, or teleparallelism for short. This new theory is fully equivalent to general
Externí odkaz:
http://arxiv.org/abs/1506.03654
Autor:
Jennen, H., Pereira, J. G.
Publikováno v:
Phys. Dark Univ. 11 (2016) 49-53
We present a generalization of teleparallel gravity that is consistent with local spacetime kinematics regulated by the de Sitter group $SO(1,4)$. The mathematical structure of teleparallel gravity is shown to be given by a nonlinear Riemann-Cartan g
Externí odkaz:
http://arxiv.org/abs/1506.02012
In addition to the usual linear gravitational waves in transverse-traceless coordinates, higher-order gravitational field equations, as well as their corresponding solutions, are explicitly obtained. It is found that higher-order waves do not represe
Externí odkaz:
http://arxiv.org/abs/1504.07817