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12 papers · 2 filters
Hamiltonian analysis of higher derivative scalar-tensor theories
David Langlois, Karim Noui
We perform a Hamiltonian analysis of a large class of scalar-tensor Lagrangians which depend quadratically on the second derivatives of a scalar field. By resorting to a convenient…
Time transfer functions in Schwarzschild-like metrics in the weak-field limit: A unified description of Shapiro and lensing effects
Bernard Linet, Pierre Teyssandier
We present a complete analysis of the light rays within the linearized, weak-field approximation of a Schwarzschild-like metric describing the gravitational field of an isolated, s…
Projective Loop Quantum Gravity II. Searching for Semi-Classical States
Suzanne Lanéry, Thomas Thiemann
In [arXiv:1411.3592] an extension of the Ashtekar-Lewandowski (AL) state space of Loop Quantum Gravity was set up with the help a projective formalism introduced by Kijowski [Kijow…
Degenerate higher derivative theories beyond Horndeski: evading the Ostrogradski instability
David Langlois, Karim Noui
Theories with higher order time derivatives generically suffer from ghost-like instabilities, known as Ostrogradski instabilities. This fate can be avoided by considering "degenera…
The Jacobi-metric for timelike geodesics in static spacetimes
G. W. Gibbons
It is shown that the free motion of massive particles moving in static spacetimes are given by the geodesics of an energy-dependent Riemannian metric on the spatial sections analog…
Scalar Field Cosmologies With Inverted Potentials
B. Boisseau, H. Giacomini, D. Polarski
Regular bouncing solutions in the framework of a scalar-tensor gravity model were found in a recent work. We reconsider the problem in the Einstein frame (EF) in the present work.…