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: 2019
• Jahr: 4 April 2019
• Umfang: 27 S.
• Fussnoten: Gesehen am 21.08.2019
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2019
• Band/Heft Quelle: 99(2019,8) Artikel-Nummer 086002, 27 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.99.086002
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1671781864

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.