145 citations · 907 across the 31 of their papers we have counts for
33 papers
Projective Symmetry and Its Breaking in Quadratic Metric-Affine Gravity
Carmen Ferrara, María José Guzmán, Laur Järv
We investigate generalized projective symmetry and its breaking in four-dimensional parity-even metric-affine gravity, considering an action linear in curvature and at most quadrat…
Scalar field with nonminimal couplings to metric-affine geometry
Ilaria Andrei, Damianos Iosifidis, Laur Järv +1
We study a scalar field nonminimally coupled to metric-affine gravity within actions linear in the affine curvature and containing all independent parity-even and parity-odd terms…
Temperature effects on white dwarfs in modified gravity
Sofía Vidal, Aneta Wojnar, Laur Järv
In this article we analyze the effects of a finite temperature equation of state on the equilibrium structure of white dwarfs in massive Brans-Dicke theory as well as the symmetron…
Inflation with Nieh-Yan-like terms in metric-affine gravity
Ilaria Andrei, Christian Dioguardi, Damianos Iosifidis +3
We study single-field slow-roll inflation in metric-affine gravity with a scalar field non-minimally coupled to the non-Riemannian Ricci scalar and to the divergences of the torsio…
Crystallized white dwarf stars in scalar-tensor gravity
Sofía Vidal, Aneta Wojnar, Laur Järv +1
We study the effects of massive scalar-tensor theories on the internal properties, crystallization, and cooling process of white dwarf stars that might potentially solve observatio…
Exploring the stability of cosmology near general relativity limit with different connections
María-José Guzmán, Laur Järv, Laxmipriya Pati
In this work, we study cosmological spacetime configurations in gravity with nonvanishing symmetric teleparallel connections. It is known that the spatially flat, homogeneou…
Global Portraits of Nonminimal Inflation: Metric and Palatini
Laur Järv, Sotirios Karamitsos, Margus Saal
In this paper, we study the global phase space dynamics of single nonminimally coupled scalar field inflation models in the metric and Palatini formalisms. Working in the Jordan fr…
Conventionalism, cosmology and teleparallel gravity
Laur Järv, Piret Kuusk
We consider homogeneous and isotropic cosmological models in the framework of three geometrical theories of gravitation: in the Einstein general relativity they are given in terms…
Propagation and lensing of gravitational waves in Palatini gravity
Sreekanth Harikumar, Laur Järv, Margus Saal +2
Accelerated expansion of the Universe prompted searches of modified gravity theory beyond general relativity, instead of adding a mysterious dark energy component with exotic physi…
Stability of symmetric teleparallel scalar-tensor cosmologies with alternative connections
Laur Jarv, Laxmipriya Pati
In symmetric teleparallel geometry the curvature and torsion tensors are assumed to vanish identically, while the dynamics of gravity is encoded by nonmetricity. Here the spatially…
Coincident gauge for static spherical field configurations in symmetric teleparallel gravity
Sebastian Bahamonde, Laur Järv
In symmetric teleparallel gravities, where the independent connection is characterized by nonmetricity while curvature and torsion are zero, it is possible to find a coordinate sys…
Black hole solutions in scalar-tensor symmetric teleparallel gravity
Sebastian Bahamonde, Jorge Gigante Valcarcel, Laur Järv +1
Symmetric teleparallel gravity is constructed with a nonzero nonmetricity tensor while both torsion and curvature are vanishing. In this framework, we find exact scalarised spheric…
Plebański-Demiański solutions with dynamical torsion and nonmetricity fields
Sebastian Bahamonde, Jorge Gigante Valcarcel, Laur Järv
We construct Plebański-Demiański stationary and axisymmetric solutions with two expanding and double principal null directions in the framework of Metric-Affine gauge theory of gra…
Global portraits of nonminimal teleparallel inflation
Laur Järv, Joosep Lember
We construct the global phase portraits of inflationary dynamics in teleparallel gravity models with a scalar field nonminimally coupled to torsion scalar. The adopted set of varia…
Global portraits of nonminimal inflation
Laur Järv, Alexey Toporensky
We reconsider the dynamical systems approach to analyze inflationary universe in the Jordan frame models of scalar field nonminimally coupled to curvature. The adopted set of varia…
Covariant formulation of scalar-torsion gravity
Manuel Hohmann, Laur Järv, Ulbossyn Ualikhanova
We consider a generalized teleparallel theory of gravitation, where the action contains an arbitrary function of the torsion scalar and a scalar field, , thus encompassing…
Teleparallel theories of gravity as analogue of non-linear electrodynamics
Manuel Hohmann, Laur Järv, Martin Krššák +1
The teleparallel formulation of gravity theories reveals close structural analogies to electrodynamics, which are more hidden in their usual formulation in terms of the curvature o…
A frame independent classification of single field inflationary models
Laur Järv, Kristjan Kannike, Luca Marzola +5
Seemingly unrelated models of inflation that originate from different physical setups yield, in some cases, identical predictions for the currently constrained inflationary observa…
Post-Newtonian parameter for multiscalar-tensor gravity with a general potential
Manuel Hohmann, Laur Jarv, Piret Kuusk +2
We compute the parametrized post-Newtonian parameter in the case of a static point source for multiscalar-tensor gravity with completely general nonderivative couplings and pot…
The formalism of invariants in scalar-tensor and multiscalar-tensor theories of gravitation
Laur Jarv, Piret Kuusk, Margus Saal +1
We give a brief summary of the formalism of invariants in general scalar-tensor and multiscalar-tensor gravities without derivative couplings. By rescaling of the metric and repara…
General relativity as an attractor for scalar-torsion cosmology
Laur Jarv, Alexey Toporensky
We study flat Friedmann-Lemaitre-Robertson-Walker cosmological models for a scalar field coupled nonminimally to teleparallel gravity with generic coupling and potential functions.…
Invariant quantities in the multiscalar-tensor theories of gravitation
Piret Kuusk, Laur Jarv, Ott Vilson
The aim of the current paper is to study the multiscalar-tensor theories of gravity without derivative couplings. We construct a few basic objects that are invariant under a Weyl r…
Transformation properties and general relativity regime in scalar-tensor theories
Laur Jarv, Piret Kuusk, Margus Saal +1
We consider first generation scalar-tensor theories of gravitation in a completely generic form, keeping the transformation functions of the local rescaling of the metric and the s…
Parametrizations in scalar-tensor theories of gravity and the limit of general relativity
Laur Jarv, Piret Kuusk, Margus Saal +1
We consider a general scalar-tensor theory of gravity and review briefly different forms it can be presented (different conformal frames and scalar field parametrizations). We inve…