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19 papers · 1 filter
Dynamics of test bodies with spin in de Sitter spacetime
Yuri N. Obukhov, Dirk Puetzfeld
We study the motion of spinning test bodies in the de Sitter spacetime of constant positive curvature. With the help of the 10 Killing vectors, we derive the 4-momentum and the ten…
Spin dynamics in gravitational fields of rotating bodies and the equivalence principle
Yuri N. Obukhov, Alexander J. Silenko, Oleg V. Teryaev
We discuss the quantum and classical dynamics of a particle with spin in the gravitational field of a rotating source. A relativistic equation describing the motion of classical sp…
Bounds on M/R for static objects with a positive cosmological constant
Hakan Andreasson, Christian G. Boehmer
We consider spherically symmetric static solutions of the Einstein equations with a positive cosmological constant which are regular at the centre, and we investigate the infl…
Stability of the Einstein static universe in modified Gauss-Bonnet gravity
Christian G. Boehmer, Francisco S. N. Lobo
We analyze the stability of the Einstein static universe by considering homogeneous perturbations in the context of f(G) modified Gauss-Bonnet theories of gravity. By considering a…
And what if gravity is intrinsically quantic ?
Houri Ziaeepour
Since the early days of search for a quantum theory of gravity the attempts have been mostly concentrated on the quantization of an otherwise classical system. The two most content…
Lattice refinement in loop quantum cosmology
Mairi Sakellariadou
Lattice refinement in LQC, its meaning and its necessity are discussed. The rôle of lattice refinement for the realisation of a successful inflationary model is explicitly shown. A…