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About the Cauchy problem in Stelle's quadratic gravity
(IOP Publishing, 2019-03)
The focus of the present work is on the Cauchy problem for the quadratic gravity models introduced in \cite{stelle,stelle2}. These are renormalizable higher order derivative models of gravity, but at cost of ghostly states ...
Critical points of the exotic massive 3D gravity
(Elsevier Science, 2020-09)
Exotic Massive 3D Gravity (EMG) is a higher order generalization of Topologically Massive Gravity. As in other theories of this sort, the conserved charges associated to the asymptotic diffeomorphisms that preserve the ...
Higher-order modified Starobinsky inflation
(Iop Publishing Ltd, 2019-02-01)
An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, del R-mu del R-mu, is considered. The analyzis is done in the ...
Cosmic acceleration from second order gauge gravity
(Springer, 2011-03-01)
We construct a phenomenological theory of gravitation based on a second order gauge formulation for the Lorentz group. The model presents a long-range modification for the gravitational field leading to a cosmological model ...
Cosmic acceleration from second order gauge gravity
(Springer, 2011-03-01)
We construct a phenomenological theory of gravitation based on a second order gauge formulation for the Lorentz group. The model presents a long-range modification for the gravitational field leading to a cosmological model ...
Deeper discussion of Schrödinger invariant and logarithmic sectors of higher-curvature gravity
(American Physical Society, 2011-05)
The aim of this paper is to explore D-dimensional theories of pure gravity whose space of solutions contains a certain class of anti-de Sitter waves including, in particular, Schrödinger invariant spacetimes. This leads ...
Fronsdal fields from gauge functions in Vasiliev's higher spin gravity
(2019)
In this paper, we revisit a number of issues in Vasiliev's theory related to gauge functions, ordering schemes, and the embedding of Fronsdal fields into master fields. First, we parametrize a broad equivalence class of ...
Collective scattering of massive stars in higher order gravity
(1997-01-15)
In the weak field approximation of higher order gravity theory a gravitational potential is described by a Newtonian plus a Yukawa-like term. This new term is used to explain some aspects of galactic dynamics, without ...
Pseudoinvariance and the extra degree of freedom in f (T) gravity
(American Physical Society, 2020-04)
Nonlinear generalizations of teleparallel gravity entail the modification of a Lagrangian that is pseudoinvariant under local Lorentz transformations of the tetrad field. This procedure consequently leads to the loss of ...