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Besides reading textbooks on GR, searching on the web and on scientific journals, I found some interesting approaches of general relativity not based on the equivalence principle but on the gauge principle, namely the cornerstone of quantum field theory and the standard model.

According to these approaches spacetime remains flat and gravitational forces arise as a consequence of (Lagrangian) invariance under arbitrary local spacetime translations.

Maybe I missed more interesting and important papers on the subject . But I noticed the approach from the Cambridge group: arXiv:gr-qc/0405033v1

(Authors: Lasenby, Doran and Gull) and also tha approach by a Chinese physicist Ning Wu

(see e.g arXiv:hep-th/0112062 v2).

The development of gravitation as a gauge theory, as I understand, is quite older than these papers, but older approaches seems to maintain curved spacetime. Also the Nobel laureate Frank Wilczek worked on such gauge approaches (he published a paper on phys. rev. lett.: IASSNS-HEP-97/142).

The point is that these apporaches have been largely ignored by the scientific community.

Thus I would like to hear from some expert if they are wrong, if they have some weakness,

if these (and possibly others) gauge approaches in flat spacetime can be considered meaningful or not.

Thanks