Early-universe plasma may have suppressed dark photons, study suggests

In the universe's first fractions of a second, a primordial plasma may have quietly governed the behavior of dark photons — hypothetical particles long suspected of carrying forces through the invisible dark sector. A new study proposes that the dense sea of free charges flooding the early cosmos acted as a natural shield, suppressing dark photon energy before it could overheat the universe and distort the thermal history we observe today. The finding invites us to see the early universe not merely as a stage for creation, but as a self-regulating system whose ancient physics still encodes sec