In physics, the interpretation of an equation equaling to zero means that the equation is true - but in 4 Vector Space, Ricci Metrics (Einstein-Hilbert Action), there is a tautology, as can be shown by studying Gauß:
General investigations of curved surfaces of 1827 and 1825 http://quod.lib.umich.edu/u/umhistmath/ABR1255.0001.001?rgn=main;view=fulltext
Gauss, Carl Friedrich
Disquisitiones Generales circa superficies
https://archive.org/details/disquisitionesg00gausgoog
Full Text
https://archive.org/stream/disquisitionesg00gausgoog/disquisitionesg00gausgoog_djvu.txt
Caroli Friderici Gauß
Theorema Egregium
https://en.wikipedia.org/wiki/Theorema_Egregium
The assumption of the Randall Sundrum Modell to solve the Higgs Hierarchy problem is based on a tautology as Gauß has pointed out!
The Einstein Hilbert Action for the field equations or Palatini Gravity is based on infinitesimal steps to outer infinity and Fourier Transformation of domains.
Both Four Vector Space (Minkowsky Hilbert Metrics/Lagrange Density) and Lie SU Groups invariance in space are based on a tautology.
Foldings of a 2D (world) sheet in space has NO outer infinity mediation or Fourier/infinitesimal steps transformation
#invariance
The Foldings can be represented by higgs string vacua foldings within fermions in view to a Pauli Spin "shield" topology phase transition.
In the higgs string vacua foldings, the Schwarzschild horizons transform from Black Hole Surfaces to proton surfaces via Black Hole states alignment.
Gravity is within a photonic mediation of BH states to the inner infinity interpretation of Horizons (dimensional transiting) between string vacua.
This is why Gravity is neither a force nor weak: the transiting Black Hole Ghost virtuals transform within fermion foldings at +- infinity of the zero (Horizons).
Imaginary negative mass in a beyond Dirac world view – seen from higgs string vacua foldings
https://twitter.com/Neogrid/status/812941220896972800
Further Background Reading:
Structure of Compact Stars in R-squared Palatini Gravity
https://arxiv.org/abs/1607.03508
f(R)-Einstein-Palatini Formalism and smooth branes
https://arxiv.org/abs/1603.04793
The Randall-Sundrum Model
https://www-thphys.physics.ox.ac.uk/people/MaximeGabella/rs.pdf
Lagrangian formulation of GR
http://www.tapir.caltech.edu/~chirata/ph236/2011-12/lec33.pdf
Static Spherically-Symmetric Stellar Structure in General Relativity,
Tolman-Oppenheimer-Volkoff (TOV) equations
http://www.tapir.caltech.edu/~cott/CGWAS2013/TOV_Notes.pdf
To put it in a nutshell, what we observe as pull/push by higgs string vacua via neg. -e space string is a topo fermion folding 2 BH state
Annihilation: Photon neg. + photon + (via neg space/string) e (DE) - Z (DM)
This is why antimatter is shielded on quantum level - thus Dark Matter explains seemingly the symmetry break between Matter and Antimatter. The Dark Matter field works like an Insulator (Thanks Michael Balmer).
This is why there is no positive charge identity beyond the Pauli fermion "shield", it cannot be translocated as magnetic monopol to an anti gluon color.
Example: