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7 papers · 2 filters
Various Hamiltonian formulations of f(R) gravity and their canonical relationships
Nathalie Deruelle, Yuuiti Sendouda, Ahmed Youssef
Various Hamiltonian formulations of f(R) gravity can be found in the literature. Some authors follow the Ostrogradsky treatment of higher derivative theories and introduce as extra…
Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
C. Deffayet, S. Deser, G. Esposito-Farese
We extend to curved backgrounds all flat-space scalar field models that obey purely second-order equations, while maintaining their second-order dependence on both field and metric…
Reconstructing the Distortion Function for Nonlocal Cosmology
C. Deffayet, R. P. Woodard
We consider the cosmology of modified gravity models in which Newton's constant is distorted by a function of the inverse d'Alembertian acting on the Ricci scalar. We derive a tech…
Cosmological footprints of loop quantum gravity
J. Grain, A. Barrau
The primordial spectrum of cosmological tensor perturbations is considered as a possible probe of quantum gravity effects. Together with string theory, loop quantum gravity is one…
An algorithm for detection of extreme mass ratio inspirals in LISA data
Stanislav Babak, Jonathan R. Gair, Edward K. Porter
The gravitational wave signal from a compact object spiralling toward a massive black hole (MBH) is thought to be one of the most difficult sources to detect in the LISA data strea…
Excised black hole spacetimes: quasi-local horizon formalism applied to the Kerr example
Nicolas Vasset, Jérôme Novak, José Luis Jaramillo
We present a numerical work aiming at the computation of excised initial data for black hole spacetimes in full general relativity, using Dirac gauge in the context of a constraine…