Eugeniu M. Popescu

TL;DR: In this paper, the authors investigated the possibility of applying the formalism of higher gauge theory to gravity in (2+1) dimensions, and they showed that a nontrivial model of (2 + 1)-dimensional gravity coupled to scalar and tensorial matter fields -the $\Sigma\Phi EA$ model -can be formulated both as a standard gauge theory and as a higher-gauge theory.

TL;DR: In this article, the authors investigated the possibility of applying the formalism of higher gauge theory to gravity in 2+1 dimensions, and they showed that a nontrivial model of (2+1)-dimensional gravity coupled to scalar and tensorial matter fields, the ΣΦEA model, can be formulated as a higher-gauge theory (as well as a standard gauge theory).

TL;DR: In this article, the authors considered the coupling of scalar topological matter to (2 + 1)-dimensional gravity and carried out a canonical analysis of the classical theory, investigating its sectors and solutions, and showed that the model admits both BTZ-like blackhole solutions and homogeneous/inhomogeneous FRW cosmological solutions.

TL;DR: In this article, the authors consider a topological field theory derived from the Chern-Simons action in (2+1) dimensions with the I(ISO(2, 1)) group and investigate the canonical structure of this theory.