Tom, Your 6-dimensional theory sounds to me like what is known as an <b>ad-hoc hypothesis</b>. i.e. one which is postulated only to solve a specific problem. My question again is: what are the observational consequences of this theory? How can we test it? How can we tell, say, a 5-dimensional universe from your 6-dimensional model experimentally and/or observationally? In short, how can we distinguish your 6-dimensional universe model from the accepted 4-dimension model of standard quantum mechanics?