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125 papers
Neutron stars in degenerate higher-order scalar-tensor theories: Axial perturbations
Hamza Boumaza, David Langlois
We study the axial (or odd-parity) perturbations of neutron stars in a one-parameter subclass of Degenerate Higher-Order Scalar-tensor (DHOST) theories. After recalling the equilib…
Axial perturbations of black holes in scalar-tensor gravity: near-horizon behaviour
Karim Noui, Hugo Roussille, David Langlois
We consider axial (or odd-parity) perturbations of non-spinning hairy black holes (BH) in shift-symmetric DHOST (Degenerate Higher-Order Scalar-Tensor) theories, including terms qu…
Neutron stars in degenerate higher-order scalar-tensor theories
Hamza Boumaza, David Langlois
We study neutron star configurations in a simple shift-symmetric subfamily of degenerate higher-order scalar-tensor (DHOST) theories, whose deviations from General Relativity (GR)…
On the effective metric of axial black hole perturbations in DHOST gravity
David Langlois, Karim Noui, Hugo Roussille
We study axial (or odd-parity) perturbations about static and spherically symmetric hairy black hole (BH) solutions in shift-symmetric DHOST (Degenerate Higher-Order Scalar-Tensor)…
Linear perturbations of Einstein-Gauss-Bonnet black holes
David Langlois, Karim Noui, Hugo Roussille
We study linear perturbations about non rotating black hole solutions in scalar-tensor theories, more specifically Horndeski theories. We consider two particular theories that admi…
Black hole perturbations in modified gravity
David Langlois, Karim Noui, Hugo Roussille
We study the linear perturbations about nonrotating black holes in the context of degenerate higher-order scalar-tensor (DHOST) theories, using a systematic approach that extracts…