3 papers
gr-qc2026
Multi-gravity cosmology beyond pairwise interactions
J. Flinckman
We develop the cosmological framework for Hassan--Schmidt-May multi-gravity, a ghost-free extension of bimetric theory with genuinely non-pairwise interactions of multiple spin-2 f…
hep-th2026
On the Uniqueness of Ghost-Free Multi-Gravity -- II: Constraining antisymmetrised multi spin-2 interactions
Joakim Flinckman, S. F. Hassan
So far, only a single theory of multiple spin-2 fields is known that features genuine multi-field interactions while remaining free of Boulware-Deser-type ghost instabilities. In t…
hep-th2024
Mass spectrum and linear perturbations of ghost-free multi-spin-2 theory
J. Flinckman, S. F. Hassan
Motivated by the spin-2 nature of gravity, we consider a theory of N interacting spin-2 fields, formulated in terms of vielbeins which have been argued to be free of the Boulware-D…