Zobrazeno 1 - 10
of 609
pro vyhledávání: '"Langlois, David"'
We consider, in Minkowski spacetime, higher-order Maxwell Lagrangians with terms quadratic in the derivatives of the field strength tensor, and study their degrees of freedom. Using a 3+1 decomposition of these Lagrangians, we extract the kinetic mat
Externí odkaz:
http://arxiv.org/abs/2404.18715
We classify all higher-order generalised Einstein-Maxwell Lagrangians that include terms linear in the curvature tensor and quadratic in the derivatives of the electromagnetic field strength tensor. Using redundancies due to the Bianchi identities, d
Externí odkaz:
http://arxiv.org/abs/2312.14814
Publikováno v:
JCAP 01 (2024) 054
We present a novel approach to the numerical computation of quasi-normal modes, based on the first-order (in radial derivative) formulation of the equations of motion and using a matrix version of the continued fraction method. This numerical method
Externí odkaz:
http://arxiv.org/abs/2312.11986
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 quartic and cubic in second derivatives of the scalar field. We give a n
Externí odkaz:
http://arxiv.org/abs/2304.03055
Autor:
Boumaza, Hamza, Langlois, David
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) are characterized by a single parameter. We compute the radial profile
Externí odkaz:
http://arxiv.org/abs/2207.13624
Publikováno v:
JCAP 08 (2022) 08, 040
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) theories. We first extend to the family of DHOST theories the first-o
Externí odkaz:
http://arxiv.org/abs/2205.07746
Publikováno v:
JCAP 09 (2022) 019
We study linear perturbations about non rotating black hole solutions in scalar-tensor theories, more specifically Horndeski theories. We consider two particular theories that admit known hairy black hole solutions. The first one, Einstein-scalar-Gau
Externí odkaz:
http://arxiv.org/abs/2204.04107
The traditional approach to perturbations of nonrotating black holes in General Relativity uses the reformulation of the equations of motion into a radial second-order Schr\"odinger-like equation, whose asymptotic solutions are elementary. Imposing s
Externí odkaz:
http://arxiv.org/abs/2103.14744
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 the asymptotic behaviour of perturbations (at spatial infinity and nea
Externí odkaz:
http://arxiv.org/abs/2103.14750
Publikováno v:
Phys. Rev. D 103, 084022 (2021)
We present a novel and remarkably simple formulation of degenerate higher-order scalar-tensor (DHOST) theories whose Lagrangian is quadratic in second derivatives of some scalar field. Using disformal transformations of the metric, we identify a spec
Externí odkaz:
http://arxiv.org/abs/2012.10218