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gr-qc2010★ 36 cited
Inflation with a Weyl term, or ghosts at work
Nathalie Deruelle, Misao Sasaki, Yuuiti Sendouda +1
In order to assess the role of ghosts in cosmology, we study the evolution of linear cosmological perturbations during inflation when a Weyl term is added to the action. Our main r…
gr-qc2009★ 47 cited
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…