Constraining some Horndeski gravity theories
نویسندگان
چکیده
منابع مشابه
Exploring gravitational theories beyond Horndeski
We have recently proposed a new class of gravitational scalar-tensor theories free from Ostrogradski instabilities, in Ref. [1]. As they generalize Horndeski theories, or “generalized” galileons, we call them G. These theories possess a simple formulation when the time hypersurfaces are chosen to coincide with the uniform scalar field hypersurfaces. We confirm that they contain only three propa...
متن کاملObservational signatures of the theories beyond Horndeski
In the approach of the effective field theory of modified gravity, we derive the equations of motion for linear perturbations in the presence of a barotropic perfect fluid on the flat isotropic cosmological background. In a simple version of Gleyzes-Langlois-Piazza-Vernizzi (GLPV) theories, which is the minimum extension of Horndeski theories, we show that a slight deviation of the tensor propa...
متن کاملConstraining theories of embodied cognition.
Influences of perceptual and motor activity on evaluation have led to theories of embodied cognition suggesting that putatively complex judgments can be carried out using only perceptual and motor representations. We present an experiment that revisited a movement-compatibility effect in which people are faster to respond to positive words by pulling a lever than by pushing a lever and are fast...
متن کاملScalar-tensor Theories of Gravity: Some personal history
From a perspective of some 50 years or more, this paper reviews my recall of the early days of scalar-tensor alternatives to standard Einstein general relativistic theory of gravity. Of course, the story begins long before my involvement, going back to the proposals of Nordström in 1914, and that of Kaluza, Klein, et al., a few years later, so I include reviews of these seminal ideas and those ...
متن کامل5 Constraining Inverse Curvature Gravity with Supernovae
We show that the current accelerated expansion of the Universe can be explained without resorting to dark energy. Models of generalized modified gravity, with inverse powers of the curvature can have late time accelerating attractors without conflicting with solar system experiments. We have solved the Friedman equations for the full dynamical range of the evolution of the Universe. This allows...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.95.044037