148 citations · 1.2k across the 38 of their papers we have counts for
13 papers · 1 filter
Non-uniqueness of boundary-value problems in Renormalization Group flows
Astrid Eichhorn, Zois Gyftopoulos, Aaron Held
The Renormalization Group flow connects microscopic to macroscopic descriptions of a system and is therefore typically considered as an initial-value problem. Motivated by situatio…
Quantum mechanics with a ghost: Counterexamples to spectral denseness
Cédric Deffayet, Atabak Fathe Jalali, Aaron Held +2
We quantise integrable point-particle systems with opposite-sign kinetic terms and nontrivial interactions. Using methods from separability theory, we show that previously determin…
Unitary Time Evolution and Vacuum for a Quantum Stable Ghost
Cédric Deffayet, Atabak Fathe Jalali, Aaron Held +2
We quantize a classically stable system of a harmonic oscillator polynomially coupled to a ghost with negative kinetic energy. We prove that due to an integral of motion with a pos…
On the Renormalization Group flow of distributions
Astrid Eichhorn, Aaron Held
Renormalization Group flows relate the values of couplings at different scales. Here, we go beyond the Renormalization Group flow of individual trajectories and derive an evolution…
Effective asymptotic safety and its predictive power: Gauge-Yukawa theories
Aaron Held
Effective field theory provides a new perspective on the predictive power of Renormalization Group fixed points. Critical trajectories between different fixed points confine the re…
Predictive power of grand unification from quantum gravity
Astrid Eichhorn, Aaron Held, Christof Wetterich
If a grand-unified extension of the asymptotically safe Reuter fixed-point for quantum gravity exists, it determines free parameters of the grand-unified scalar potential. All quar…
Towards implications of asymptotically safe gravity for particle physics
Astrid Eichhorn, Aaron Held
We review aspects of the interplay of asymptotically safe gravity with matter, focusing on the potential predictive power of the quantum scale-symmetry underlying the asymptoticall…
Asymptotic safety, string theory and the weak gravity conjecture
Senarath de Alwis, Astrid Eichhorn, Aaron Held +3
We propose a scenario with string theory in the deep ultraviolet, an intermediate asymptotically safe scaling regime for gravity and matter, and the Standard Model in the infrared.…
Mass difference for charged quarks from asymptotically safe quantum gravity
Astrid Eichhorn, Aaron Held
We propose a scenario to retrodict the top and bottom mass and the Abelian gauge coupling from first principles in a microscopic model including quantum gravity. In our approximati…
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…
Top mass from asymptotic safety
Astrid Eichhorn, Aaron Held
We discover that asymptotically safe quantum gravity could predict the top-quark mass. For a broad range of microscopic gravitational couplings, quantum gravity could provide an ul…
Is scale-invariance in gauge-Yukawa systems compatible with the graviton?
Nicolai Christiansen, Astrid Eichhorn, Aaron Held
We explore whether perturbative interacting fixed points in matter systems can persist under the impact of quantum gravity. We first focus on semi-simple gauge theories and show th…
Quantum-gravity effects on a Higgs-Yukawa model
Astrid Eichhorn, Aaron Held, Jan M. Pawlowski
A phenomenologically viable theory of quantum gravity must accommodate all observed matter degrees of freedom and their properties. Here, we explore whether a toy model of the Higg…