Journal Article2023Cited by 7

Quantum (in)stability of maximally symmetric space-times

Ghosh, J. K. Kiritsis, E. Nitti

J. High Energy Phys. 2023

Springer Science and Business Media LLC, Vol. 2023, Issue 98, ISBN: 1029-8479

DOI: 10.1007/jhep11(2023)098URL

Abstract

Abstract Classical gravity coupled to a CFT4 (matter) is considered. The effect of the quantum dynamics of matter on gravity is studied around maximally symmetric spaces (flat, de Sitter and Anti de Sitter). The structure of the graviton propagator is modified and non-trivial poles appear due to matter quantum effects. The position and residues of such poles are mapped as a function of the relevant parameters, the central charge of the CFT4, the two R2 couplings of gravity as well as the curvature of the background space-time. The instabilities induced are determined. Such instabilities can be important in cosmology as they trigger the departure from de Sitter space and in some regions of parameters are more important than the well-known scalar instabilities. It is also determined when the presence of such instabilities is unreliable if the associated scales are larger than the “species” cutoff of the gravitational theory.

Keywords

  • Anti-de Sitter space
  • flat space
  • central charge
  • graviton propagator
  • De Sitter space
  • R^2 gravity
  • conformal field theory
  • quantum gravity corrections
  • quantum instability
  • cosmological instability

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