A massless universe with only one (unifying) force?

[Guest]

Is it possible to have a massless universe with only one (unifying) force (of nature)?

FYI: 'Massless particles can’t be stopped.
If a particle has no mass, how can it exist?'

https://www.symmetrymagazine.org/article/massless-particles-cant-be-stopped.

[Guest]

FYI: 'Exotic tetraquark: CERN physicists discover novel particle.
Once again, particle physicists at CERN have discovered a previously unknown state of matter. It consists of four charm quarks and is probably the first find in a new class of particles.'

https://www.dw.com/en/exotic-tetraquark-cern-physicists-discover-novel-particle/a-54077420.