157 citations · 895 across the 13 of their papers we have counts for
12 papers · 1 filter
On Exact Proper Time Wilsonian RG Flows
A. Bonanno, S. Lippoldt, R. Percacci +1
We discuss the possibility to define exact RG equations for a UV regulated Wilsonian action based on a proper time (PT) regulator function. We start from a functional mapping which…
Zooming in on fermions and quantum gravity
Astrid Eichhorn, Stefan Lippoldt, Marc Schiffer
We zoom in on the microscopic dynamics for fermions and quantum gravity within the asymptotic-safety paradigm. A key finding of our study is the unavoidable presence of a nonminima…
How perturbative is quantum gravity?
Astrid Eichhorn, Stefan Lippoldt, Jan M. Pawlowski +2
We explore asymptotic safety of gravity-matter systems, discovering indications for a near-perturbative nature of these systems in the ultraviolet. Our results are based on the dyn…
Renormalized Functional Renormalization Group
Stefan Lippoldt
We construct a new version of the effective average action together with its flow equation. The construction entails in particular the consistency of fluctuation field and backgrou…
Nonminimal hints for asymptotic safety
Astrid Eichhorn, Stefan Lippoldt, Vedran Skrinjar
In the asymptotic-safety scenario for gravity, nonzero interactions are present in the ultraviolet. This property should also percolate into the matter sector. Symmetry- based argu…
Correlation functions on a curved background
Benjamin Knorr, Stefan Lippoldt
We investigate gravitational correlation functions in a curved background with the help of nonperturbative renormalization group methods. Beta functions for eleven couplings are de…
The Gravitational Two-Loop Counterterm is Asymptotically Safe
Holger Gies, Benjamin Knorr, Stefan Lippoldt +1
Weinberg's asymptotic safety scenario provides an elegant mechanism to construct a quantum theory of gravity within the framework of quantum field theory based on a non-Gaußian fix…
Generalized Parametrization Dependence in Quantum Gravity
Holger Gies, Benjamin Knorr, Stefan Lippoldt
We critically examine the gauge, and field-parametrization dependence of renormalization group flows in the vicinity of non-Gaußian fixed points in quantum gravity. While physical…
Spin-base invariance of Fermions in arbitrary dimensions
Stefan Lippoldt
The concept of spin-base invariance is extended to arbitrary integer dimension . Explicit formulas for the spin connection as a function of the Dirac matrices are found.…
Global surpluses of spin-base invariant fermions
Holger Gies, Stefan Lippoldt
The spin-base invariant formalism of Dirac fermions in curved space maintains the essential symmetries of general covariance as well as similarity transformations of the Clifford a…
Fermions in gravity with local spin-base invariance
Holger Gies, Stefan Lippoldt
We study a formulation of Dirac fermions in curved spacetime that respects general coordinate invariance as well as invariance under local spin-base transformations. The natural va…
Renormalization flow towards gravitational catalysis in the 3d Gross-Neveu model
Holger Gies, Stefan Lippoldt
Catalyzed symmetry breaking arises from a parametric enhancement of critical fluctuations independently of the coupling strength. Symmetry-breaking fermionic long-range fluctuation…