Could fresh lava be (warm) dark matter?
  Dark matter models can be classified according to their impact on the
properties of galaxies, including cold dark matter (CDM), warm dark matter
(WDM), self-interacting dark matter (SIDM) and fuzzy dark matter (FDM). In
celebration of April Fool's Day, and also of the 1-year anniversary of the
start of the 2022 volcanic eruption at Fagradalsfjall here in Iceland, we
explore fresh lava as a candidate for WDM specifically. We verify first hand
that lava is indeed warm (exhibits free-streaming and retains temperature for
several months after the eruption ends, is 1000K, sets fire to grass, can feel
one's eyebrows singe at a distance of 4m) and dark once sufficiently decoupled
from its source of production.
