2012/06/18 by Marios Christodoulou, Aldo Riello, Carlo Rovelli · 1 citation
Physics and Astronomy · #gr-qc #hep-th
paper · pdf · doi:10.1142/s021827181242014x
Article awarded with an "Honorable Mention" from the 2012 Gravity Foundation Award. 6 pages, 8 (pretty) figures
arxiv created 2012/06/18 · arxiv updated 2015/06/05
Is it possible, in principle, to measure the sign of the Lapse? We show that fermion dynamics distinguishes spacetimes having the same metric but different tetrads, for instance a Lapse with opposite sign. This sign might be a physical quantity not captured by the metric. We discuss its possible role in quantum gravity.