The Coming Revolutions in Fundamental Physics--as seen by string-master David Gross http://seminput.aei.mpg.de/more_info.php?which=2478&talk=index ==quote== Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut The Coming Revolutions in Fundamental Physics Wed 7 Oct 2009, 14:00 Prof. David Gross (Kavli Institute, Santa Barbara) "I review the present state of knowledge in elementary particle physics and the questions that we are currently addressing. I discuss the experimental revolutions that might occur at the Large Hadron Collider, soon to be finished at CERN. I shall also review the state of string theory. The necessity to go beyond the standard model of particle physics and to understand quantum gravity has led to this ambitious attempt to unify all the forces of nature and all forms of matter as different vibrations of a string-like object. But string theory is still in a pre-revolutionary stage. Although remarkable progress has been achieved in the last decade we still lack a fundamental understanding of the theory. Many string theorists suspect that a profound conceptual change in our concept of space and time will be required for the final formulation of string theory." ==endquote== One could even say "for the initial formulation", let alone a final one. A profound conceptual change in the treatment of space and time has been a requirement for quantum gravitists from the very start and it is nice to know that many string theorists are beginning to suspect this. It seems clear now that such a profound conceptual change was in some sense dictated by the success of 1915 General Relativity over the past 90 years. Carlo Rovelli's perspective on this was summed up pretty well in a short essay he wrote in 2006 on the unfinished revolution in our conceptions of space and time. I'll get the link.