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gr-qc2002
Gravitation and the Local Symmetry Group of Spacetime
M. Calcada, J. G. Pereira
According to general relativity, the interaction of a matter field with gravitation requires the simultaneous introduction of a tetrad field, which is a field related to translatio…
gr-qc2001
Kinematics of a Spacetime with an Infinite Cosmological Constant
R. Aldrovandi, A. L. Barbosa, M. Calcada +1
A solution of the sourceless Einstein's equation with an infinite value for the cosmological constant Λis discussed by using Inonu-Wigner contractions of the de Sitter groups and s…