Talk abstract details

Among the known lagrangian terms which provide massive degrees of freedom to gravity, we focus our attention on a Chern-Simons term in 2+1 dimention, preserving (up to a boundary term) gauge, diffeomorfism and conformal symmetries. We consider the inclusion of this type of term in a Yang-Mills formulation of gravity [1] with a cosmological contribution, based on a principal fiber bundle of GL(3,R) lie group and with a not necessarily torsionless base space [2]. There, we explore consistence showing that Deser-Jackiw-Templeton formulation is contained in this type of construction and excitations must be causal.

[1] F. Mansouri, L.N. Chang, {\it Phys. Rev. }{\bf D13}, 12, 3192
(1976) ; F. Mansouri, {\it Phys. Rev. }{\bf D16}, 8 ,2456 (1977).

[2] R. Gaitan, {\it Mod. Phys. Lett. }{\bf A}, 18, 25,
1753 (2003) .