Dark matter scenarios with multiple spin-2 fields

Understand

We study ghost-free multimetric theories for $(N+1)$ tensor fields with a coupling to matter and maximal global symmetry group $S_N\times(Z_2)^N$.

• Their mass spectra contain a massless mode, the graviton, and $N$ massive spin-2 modes.
• One of the massive modes is distinct by being the heaviest, the remaining $(N-1)$ massive modes are simply identical copies of each other.
• All relevant physics can therefore be understood from the case $N=2$.