2003/11/04 by S. Roy
Physics and Astronomy · #gr-qc
published as Kluwer Academic Publishers, 2003 · 14 pages, Invited talk at advanced NATO school, Tratanska, 2002
arxiv created 2003/11/04 · arxiv updated 2009/12/01
Recent progress in quantum gravity and string theory has raised interest among scientists to whether or not nature behaves discretely at the Planck scale. There are two attitudes twoards this discretenes i.e. top-down and bottom-up approach. We have followed up the bottom-up approach. Here we have tried to describe how macroscopic space-time or its underlying mesoscopic substratum emerges from a more fundamental concept. The very concept of space-time, causality may not be valid beyond Planck scale. We have introduced the concept of generalised time within the framework of Sheaf Cohomology where the physical time emrges around and above Planck scale. The possible physical amd metaphysical implications are discussed.