2+1 boyutlu yer çekimi teorileri

(2+1) dimensional Topologically Massive Gravity (TMG) and New Massive Gravity (NMG) theories are studied. These theories have higher order derivatives of metrictensor in their field equations which make them both renormalizable and unitary. Field equations of TMG are derived using variational methods. A null frame is introducedin general and TMG field equations are written in the null frame. pp-wave solutions of TMG are given. NMG field equations in the null frame are also derived. The pp-wave and recently found bending AdS wave solutions of NMG are given.