Padmanabhan, T.Narlikar, J. V.2012-03-182012-03-181981-05-05http://hdl.handle.net/11007/1534A model theory for quantized gravity is discussed whereonly selected degrees of freedomare quantized. The concept of stationary states is introduced. It is shown that the Planck length arises as a lower bound to the space—time length scale in a natural way.enQuantum gravitySpace-timeArticle