Zobrazeno 1 - 10
of 909
pro vyhledávání: '"A Noui"'
We study new classes of metric transformations in the context of scalar-tensor theories, which involve both higher derivatives of the scalar field and derivatives of the metric itself. In general, such transformations are not invertible as they invol
Externí odkaz:
http://arxiv.org/abs/2405.13126
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
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 10, Pp 1-27 (2024)
Abstract 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 ki
Externí odkaz:
https://doaj.org/article/f16c5da8b5344c47b6e1c7e22ddb2262
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:
Maurice Leponce, Yves Basset, Ángela Aristizábal-Botero, Noui Baïben, Jérôme Barbut, Bart Buyck, Philip Butterill, Kim Calders, Glenda Cárdenas, Jean-François Carrias, Damien Catchpole, Barbara D’hont, Jacques Delabie, Jochen Drescher, Damien Ertz, André Heughebaert, Valérie Hofstetter, Céline Leroy, Frédéric Melki, Johan Michaux, Jhon César Neita-Moreno, Eddy Poirier, Rodolphe Rougerie, Germinal Rouhan, Vincent Rufray, Stefan Scheu, Jürgen Schmidl, Alain Vanderpoorten, Claire Villemant, Nabil Youdjou, Olivier Pascal
Publikováno v:
Frontiers in Forests and Global Change, Vol 7 (2024)
Large tropical trees are rightly perceived as supporting a plethora of organisms. However, baseline data about the variety of taxa coexisting on single large tropical trees are lacking and prevent a full understanding of both the magnitude of biodive
Externí odkaz:
https://doaj.org/article/d5ddbd20679a4331880816bd189134d0
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
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 3, Pp 1-24 (2024)
Abstract 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 iden
Externí odkaz:
https://doaj.org/article/4c22cb9dc29c4a8cbf0a0d0fb85f53bf