Results 261 to 270 of about 167,529,233 (288)

Overlapping qubits from non-isometric maps and de Sitter tensor networks. [PDF]

Nat Commun
Cao C, Chemissany W, Jahn A, Zimborás Z.   +3 more
europepmc   +1 more source

Modified teleparallel theories of gravity [PDF]

Physical Review D, 2015
9 pages, 1 figure; some typos fixed, slightly improved ...
Sebastian Bahamonde, Christian G Böhmer
exaly   +7 more sources

Inflationary Cosmology in Modified Gravity Theories [PDF]

Symmetry, 2015
We review inflationary cosmology in modified gravity such as R2 gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inflation realized by three kinds of effects: modification of gravity, the quantum anomaly, and the R2 term in loop quantum cosmology.
Kazuharu Bamba, Sergei Odintsov
exaly   +3 more sources

Challenges in connecting modified gravity theory and observations

Physical Review D, 2017
Cosmic acceleration may be due to modifications of cosmic gravity and to test this we need robust connections between theory and observations. However, in a model independent approach like effective field theory or a broad class like Horndeski gravity, several free functions of time enter the theory.
Eric Linder
exaly   +4 more sources

Modified teleparallel theories of gravity: Gauss–Bonnet and trace extensions [PDF]

European Physical Journal C, 2016
We investigate modified theories of gravity in the context of teleparallel geometries with possible Gauss-Bonnet contributions. The possible coupling of gravity with the trace of the energymomentum tensor is also taken into account.
Sebastian Bahamonde, Christian G Böhmer
exaly   +3 more sources

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Testing theories of modified gravity

Physics Today, 2017
With further refinement, observations of supermassive black holes could test the presence of a universal scalar field. With further refinement, observations of supermassive black holes could test the presence of a universal scalar field.
openaire   +1 more source

An extended theory of gravity in a modified Riemann’s geometry

International Journal of Geometric Methods in Modern Physics, 2019
In this work, we study the evolution of an isotropic universe in an extended theory of gravity obtained geometrically by transforming the normal-gauge Lyra displacement vector field [Formula: see text] as a complex vectorial function depending on a dynamical scalar field [Formula: see text]. By using the latest observational data, we observe that for [
Hoavo Hova, Huanxiong Yang, Samuel Owusu
openaire   +2 more sources

ON IMPLICATIONS OF EQUIVALENCE PRINCIPLE FOR MODIFIED GRAVITY THEORIES

International Journal of Modern Physics D, 2011
One of the manifestations of Einstein Equivalence Principle (EEP) is that a freely falling particle in a gravitational field is following a geodesic. In Einstein's general relativity (GR) this is built in the formulation by assuming the connection to be the Levi-Civita connection. The latter may, however, be demanded to be implied by the dynamics of a
openaire   +2 more sources

Cosmology in Modified Theories of Gravity

2019
The purpose of this dissertation is to present the most typical modified theories of gravity and discuss their validity and viability in constructing a cosmological model. Current issues in cosmology, related to the Standard Cosmological model, i.e.
openaire   +1 more source