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The spin connection of twisted geometry
Hal M. Haggard, Carlo Rovelli, Francesca Vidotto +1
Twisted geometry is a piecewise-flat geometry less rigid than Regge geometry. In Loop Gravity, it provides the classical limit for each step of the truncation utilized in the defin…
General relativistic statistical mechanics
Carlo Rovelli
Understanding thermodynamics and statistical mechanics in the full general relativistic context is an open problem. I give tentative definitions of equilibrium state, mean values,…
How to detect an anti-spacetime
Marios Christodoulou, Aldo Riello, Carlo Rovelli
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…
Discrete Symmetries in Covariant LQG
Carlo Rovelli, Edward Wilson-Ewing
We study time-reversal and parity ---on the physical manifold and in internal space--- in covariant loop gravity. We consider a minor modification of the Holst action which makes i…