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: De.arxiv.org
• Jahr Quelle: 2013
• Band/Heft Quelle: (2013) Artikel-Nummer 1301.0879, 11 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1567063314

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-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.