221 research outputs found
Two-dimensional metric-affine gravity
There is a number of completely integrable gravity theories in two
dimensions. We study the metric-affine approach on a 2-dimensional spacetime
and display a new integrable model. Its properties are described and compared
with the known results of Poincare gauge gravity.Comment: Revtex, 15 pages, no figure
Plane waves in metric-affine gravity
We describe plane-fronted waves in the Yang-Mills type quadratic
metric-affine theory of gravity. The torsion and the nonmetricity are both
nontrivial, and they do not belong to the triplet ansatz.Comment: 18 pages, revtex, no figure
Exact Solutions in Poincar\'e Gauge Gravity Theory
In the framework of the gauge theory based on the Poincar\'e symmetry group,
the gravitational field is described in terms of the coframe and the local
Lorentz connection. Considered as gauge field potentials, they give rise to the
corresponding field strength which are naturally identified with the torsion
and the curvature on the Riemann--Cartan spacetime. We study the class of
quadratic Poincar\'e gauge gravity models with the most general Yang--Mills
type Lagrangian which contains all possible parity-even and parity-odd
invariants built from the torsion and the curvature. Exact vacuum solutions of
the gravitational field equations are constructed as a certain deformation of
de Sitter geometry. They are black holes with nontrivial torsion.Comment: 17 pages, no figure
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