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Scale transformations in metric-affine geometry
Damianos Iosifidis, Tomi Koivisto
This article presents an exhaustive classification of metric-affine theories according to their scale symmetries. First it is clarified that there are three relevant definitions of…
The spectrum of teleparallel gravity
Tomi Koivisto, Georgios Tsimperis
The observer's frame is the more elementary description of the gravitational field than the metric. The most general covariant, even-parity quadratic form for the frame field in ar…
Cosmological perturbations in modified teleparallel gravity models
Alexey Golovnev, Tomi Koivisto
Cosmological perturbations are considered in and in scalar-torsion teleparallel models of gravity. Full sets of linear perturbation equations are accurately derived…
Spacetime and dark matter from spontaneous breaking of Lorentz symmetry
Tom Złośnik, Federico Urban, Luca Marzola +1
It is shown that a spontaneously-broken gauge theory of the Lorentz group contains Ashtekar's chiral formulation of General Relativity accompanied by dust. From this perspective, g…
Coupling matter in modified -gravity
Tiberiu Harko, Tomi S. Koivisto, Francisco S. N. Lobo +2
We present a novel theory of gravity by considering an extension of symmetric teleparallel gravity. This is done by introducing, in the framework of the metric-affine formalism, a…
Teleparallel Palatini theories
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi Koivisto
The Palatini formalism is developed for gravitational theories in flat geometries. We focus on two particularly interesting scenarios. First, we fix the connection to be metric com…