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Asymptotic freedom and safety in quantum gravity
Saswato Sen, Christof Wetterich, Masatoshi Yamada
We compute non-perturbative flow equations for the couplings of quantum gravity in fourth order of a derivative expansion. The gauge invariant functional flow equation for arbitrar…
Early dark energy in the pre- and post-recombination epochs
Adrià Gómez-Valent, Ziyang Zheng, Luca Amendola +2
Many quintessence models possess scaling or attractor solutions where the fraction of dark energy follows the dominant component in previous epochs of the expansion, or phase trans…
Quantum fermions from classical bits
Christof Wetterich
A simple probabilistic cellular automaton is shown to be equivalent to a relativistic fermionic quantum field theory with interactions. Occupation numbers for fermions are classica…
Cosmology from pregeometry
C. Wetterich
We discuss cosmological solutions for a diffeomorphism invariant gauge theory of the non-compact Lorentz group . Besides the gauge bosons our model of pregeometry contains…
Pregeometry and spontaneous time-space asymmetry
C. Wetterich
In pregeometry a metric arises as a composite object at large distances. We investigate if its signature, which distinguishes between time and space, could be a result of the dynam…
Pregeometry and euclidean quantum gravity
Christof Wetterich
Einstein's general relativity can emerge from pregeometry, with the metric composed of more fundamental fields. We formulate euclidean pregeometry as a - Yang-Mills theory.…