Zooming in on fermions and quantum gravity

• Verfasst von: Eichhorn, Astrid [VerfasserIn]
• Verfasst von: Lippoldt, Stefan [VerfasserIn]
• Verfasst von: Schiffer, Marc [VerfasserIn]
• Titel: Zooming in on fermions and quantum gravity
• Verf.angabe: Astrid Eichhorn, Stefan Lippoldt, and Marc Schiffer
• E-Jahr: 2018
• Jahr: 20 Dec 2018
• Umfang: 27 S.
• Fussnoten: Gesehen am 24.11.2020 ; Last revised 18 Apr 2019
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 2018
• Band/Heft Quelle: (2018) Artikel-Nummer 1812.08782, 27 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: General Relativity and Quantum Cosmology
• Sach-SW: High Energy Physics - Theory
• K10plus-PPN: 1586225294

Abstract

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 nonminimal derivative coupling between the curvature and fermion fields in the ultraviolet. Its backreaction on the properties of the Reuter fixed point remains small for finite fermion numbers within a bounded range. This constitutes a nontrivial test of the asymptotic-safety scenario for gravity and fermionic matter, additionally supplemented by our studies of the momentum-dependent vertex flow which indicate the subleading nature of higher-derivative couplings. Moreover our study provides further indications that the critical surface of the Reuter fixed point has a low dimensionality even in the presence of matter.