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9 papers · 2 filters
Space-Time Foam may Violate the Principle of Equivalence
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
The interactions of different particle species with the foamy space-time fluctuations expected in quantum gravity theories may not be universal, in which case different types of en…
Aligned electric and magnetic Weyl fields
Joan Josep Ferrando Juan Antonio Sáez
We analyze the spacetimes admitting a direction for which the relative electric and magnetic Weyl fields are aligned. We give an invariant characterization of these metrics and stu…
Vacuum type I spacetimes and aligned Papapetrou fields: symmetries
Joan J. Ferrando, Juan A. Sáez
We analyze type I vacuum solutions admitting an isometry whose Killing 2--form is aligned with a principal bivector of the Weyl tensor, and we show that these solutions belong to a…
Dynamics of thick discs around Schwarzschild-de Sitter black holes
Luciano Rezzolla, Olindo Zanotti, Jose A. Font
We consider the effects of a cosmological constant on the dynamics of constant angular momentum discs orbiting Schwarzschild-de Sitter black holes. The motivation behind this study…
Type I vacuum solutions with aligned Papapetrou fields: an intrinsic characterization
Joan Josep Ferrando, Juan Antonio Sáez
We show that Petrov type I vacuum solutions admitting a Killing vector whose Papapetrou field is aligned with a principal bivector of the Weyl tensor are the Kasner and Taub metric…
On the Leibniz bracket, the Schouten bracket and the Laplacian
Bartolomé Coll, Joan Josep Ferrando
The Leibniz bracket of an operator on a (graded) algebra is defined and some of its properties are studied. A basic theorem relating the Leibniz bracket of the commutator of two op…