On unimodular quantum gravity

• Verfasst von: Eichhorn, Astrid [VerfasserIn]
• Titel: On unimodular quantum gravity
• Verf.angabe: Astrid Eichhorn
• Fussnoten: Gesehen am 11.01.2018
• Titel Quelle: Enthalten in: Classical and quantum gravity
• Jahr Quelle: 2013
• Band/Heft Quelle: 30(2013,11) Artikel-Nummer 115016, 8 Seiten
• ISSN Quelle: 1361-6382
• DOI: doi:10.1088/0264-9381/30/11/115016
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1567063233

Abstract

Unimodular gravity is classically equivalent to standard Einstein gravity, but differs when it comes to the quantum theory: the conformal factor is non-dynamical, and the gauge symmetry consists of transverse diffeomorphisms only. Furthermore, the cosmological constant is not renormalized. Thus the quantum theory is distinct from a quantization of standard Einstein gravity. Here we show that within a truncation of the full renormalization group flow of unimodular quantum gravity, there is a non-trivial ultraviolet (UV)-attractive fixed point, yielding a UV completion for unimodular gravity. We discuss important differences to the standard asymptotic-safety scenario for gravity, and provide further evidence for this scenario by investigating a new form of the gauge-fixing and ghost sector. Communicated by P R L V Moniz