A note on the total action of 4D Gauss–Bonnet theory

Apr 20, 2020
15 pages
Published in:
  • Eur.Phys.J.C 80 (2020) 10, 992
  • Published: Oct 27, 2020
e-Print:

Citations per year

202020212022202320240204060
Abstract: (Springer)
Recently, a novel four-dimensional Gauss–Bonnet theory has been suggested as a limiting case of the original D-dimensional theory with singular Gauss–Bonnet coupling constant αα/(D4)\alpha \rightarrow \alpha /(D-4). The theory is proposed at the level of field equations. Here we analyse this theory at the level of action. We find that the on-shell action and surface terms split into parts, one of which does not scale like (D4)(D-4). The limiting D4D\rightarrow 4 procedure, therefore, gives unphysical divergences in the on-shell action and surface terms in four dimensions. We further highlight various issues related to the computation of counterterms in this theory.
Note:
  • 15 pages; general discussion extended; typos corrected; references added. Published version
  • dimension: 4
  • surface
  • coupling constant
  • field equations
  • Gauss-Bonnet term
  • gravitation: model
  • gravitation: action
  • model: on-shell
  • Lagrangian formalism