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Quantum-gravity predictions for the fine-structure constant
Astrid Eichhorn, Aaron Held, Christof Wetterich
Asymptotically safe quantum fluctuations of gravity can uniquely determine the value of the gauge coupling for a large class of grand unified models. In turn, this makes the electr…
Primordial black holes from fifth forces
Luca Amendola, Javier Rubio, Christof Wetterich
Primordial black holes can be produced by a long range attractive fifth force stronger than gravity, mediated by a light scalar field interacting with nonrelativistic "heavy" parti…
Exact evolution equation for the effective potential
Christof Wetterich
We derive a new exact evolution equation for the scale dependence of an effective action. The corresponding equation for the effective potential permits a useful truncation. This a…
Gauge-invariant fields and flow equations for Yang-Mills theories
C. Wetterich
We discuss the concept of gauge-invariant fields for non-abelian gauge theories. Infinitesimal fluctuations around a given gauge field can be split into physical and gauge fluctuat…
Quantum formalism for classical statistics
C. Wetterich
In static classical statistical systems the problem of information transport from a boundary to the bulk finds a simple description in terms of wave functions or density matrices.…
Graviton fluctuations erase the cosmological constant
C. Wetterich
Graviton fluctuations induce strong non-perturbative infrared renormalization effects for the cosmological constant. The functional renormalization flow drives a positive cosmologi…