Journal ArticleDOI
Second-order scalar-tensor field equations in a four-dimensional space
TLDR
In this article, the second-order Euler-Lagrange tensors are derived from a Lagrangian which is at most of second order in the derivatives of the field functions.Abstract:
Lagrange scalar densities which are concomitants of a pseudo-Riemannian metric-tensor, a scalar field and their derivatives of arbitrary order are considered. The most general second-order Euler-Lagrange tensors derivable from such a Lagrangian in a four-dimensional space are constructed, and it is shown that these Euler-Lagrange tensors may be obtained from a Lagrangian which is at most of second order in the derivatives of the field functions.read more
Citations
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Dynamical analysis of generalized Galileon cosmology
Genly Leon,Emmanuel N. Saridakis +1 more
TL;DR: In this paper, a detailed dynamical analysis of generalized Galileon cosmology, incorporating also the requirements of ghost and instabilities absence, was performed, and it was shown that there are not any new stable late-time solutions apart from those of standard quintessence.
Journal ArticleDOI
Parity-violating gravity and GW170817
TL;DR: In this article, the authors consider the implications of observational constraints from GW170817/GRB 170817A on the propagation speed of GWs in generic parity-violating gravity, including recently proposed ghost-free theories with parity violation as well as Chern-Simons (CS) modified gravity.
Journal ArticleDOI
Effective field theory approach to modified gravity including Horndeski theory and Ho\v{r}ava-Lifshitz gravity
Ryotaro Kase,Shinji Tsujikawa +1 more
TL;DR: In this article, the effective field theory of modified gravity in which the Lagrangian involves three dimensional geometric quantities appearing in the 3+1 decomposition of space-time is reviewed.
Journal ArticleDOI
Well-posed formulation of Lovelock and Horndeski theories
Áron D. Kovács,Harvey S. Reall +1 more
TL;DR: In this paper, the initial value problem for Lovelock and Horndeski theories of gravity was studied and it was shown that the equations of motion of these theories can be written in a form that, at weak coupling, is strongly hyperbolic and therefore admits a well-posed initial value problems.
Journal ArticleDOI
New horizons for fundamental physics with LISA
K. G. Arun,Enis Belgacem,Robert Benkel,Laura Bernard,Emanuele Berti,Gianfranco Bertone,Marc Besancon,Diego Blas,Christian G. Böhmer,Richard Brito,Gianluca Calcagni,Alejandro Cárdenas-Avendaño,Katy Clough,Marco Crisostomi,V. De Luca,Daniela D. Doneva,Stephanie Escoffier,Jose María Ezquiaga,Pedro G. Ferreira,Pierre Fleury,Stefano Foffa,Gabriele Franciolini,Noemi Frusciante,Juan Garcia-Bellido,Carlos A. R. Herdeiro,Thomas Hertog,Tanja Hinderer,Philippe Jetzer,Lucas Lombriser,Elisa Maggio,Michele Maggiore,Michele Mancarella,Andrea Maselli,Sourabh Nampalliwar,David A. Nichols,Maria Okounkova,Paolo Pani,Vasileios Paschalidis,Alvise Raccanelli,Lisa Randall,Sébastien Renaux-Petel,Antonio Riotto,Milton Ruiz,A. Saffer,Mairi Sakellariadou,Ippocratis D. Saltas,B. Sathyaprakash,Lijing Shao,Carlos F. Sopuerta,Thomas P. Sotiriou,Nikolaos Stergioulas,Nicola Tamanini,Filippo Vernizzi,Helvi Witek,Kinwah Wu,Kent Yagi,Stoytcho S. Yazadjiev,Nicolás Yunes,Miguel Zilhão,Niayesh Afshordi,M. C. Angonin,Vishal Baibhav,Enrico Barausse,T. Barreiro,N. Bartolo,Nicolas Bellomo,Ido Ben-Dayan,Eric Bergshoeff,Sebastiano Bernuzzi,Daniele Bertacca,Swetha Bhagwat,Béatrice Bonga,Lior M. Burko,Geoffrey Compère,Giulia Cusin,Antonio C. da Silva,Saurya Das,Claudia de Rham,Kyriakos Destounis,Emanuela Dimastrogiovanni,F. Duque,Richard Easther,Hontas Farmer,Matteo Fasiello,S. Fisenko,Kwinten Fransen,Jörg Frauendiener,Jonathan R. Gair,László Á. Gergely,Davide Gerosa,Leonardo Gualtieri,Wen-Biao Han,Aurélien Hees,Thomas Helfer,J. Hennig,Alexander C. Jenkins,E. Kajfasz,Nemanja Kaloper,Vladimir Karas,Bradley J. Kavanagh,Sergei A. Klioner,Savvas M. Koushiappas,Macarena Lagos,C. Le Poncin-Lafitte,Francisco S. N. Lobo,Charalampos Markakis,Prado Martín-Moruno,Carlos Martins,Sabino Matarrese,Daniel R. Mayerson,José P. Mimoso,Johannes Noller,Nelson J. Nunes,Roberto Oliveri,Giorgio Orlando,George J. Pappas,Igor Pikovski,Luigi Pilo,Jiří Podolský,Geraint Pratten,Tomislav Prokopec,H. Qi,Saeed Rastgoo,Angelo Ricciardone,Rocco Rollo,Diego Rubiera-Garcia,Olga Sergijenko,Stuart Shapiro,D. M. Shoemaker,Alessandro D. A. M. Spallicci,O. S. Stashko,Leo C. Stein,Gianmassimo Tasinato,Andrew J. Tolley,Elias C. Vagenas,Stefan Vandoren,Daniele Vernieri,Rodrigo Vicente,Toby Wiseman,V. I. Zhdanov,Miguel Zumalac'arregui +140 more
TL;DR: In this article , the Fundamental Physics Working Group of the LISA Consortium summarizes the current topics in fundamental physics where LISA observations of gravitational waves can be expected to provide key input.
References
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Mach's principle and a relativistic theory of gravitation
Carl H. Brans,R. H. Dicke +1 more
TL;DR: In this paper, the role of Mach's principle in physics is discussed in relation to the equivalence principle and the difficulties encountered in attempting to incorporate Mach's principles into general relativity are discussed.
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Journal ArticleDOI
Comments on the scalar-tensor theory
TL;DR: In this article, the ponderomotive laws of a scalar-tensor theory are constructed free of approximations in the form of integral laws, and the integrals are extended over two-and three-dimensional domains that lie entirely in empty space but surround the regions containing matter.
Journal ArticleDOI
The uniqueness of the einstein field equations in a four-dimensional space.
TL;DR: In this article, the Euler-Lagrange equations corresponding to a Lagrange density which is a function of g ≥ 2 and its first two derivatives are investigated and necessary and sufficient conditions for these equations to be of second order are obtained and it is shown that in a four-dimensional space the Einstein field equations (with cosmological term) are the only permissible second order Euler Lagrange equations.
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