  If the effective cosmological constant $\Lambda$ of the present universe is
due to physical processes in the early universe operating at temperatures just
above the electroweak energy scale, it is possible that new particles with
multi-$\text{TeV}$ masses exist. These ultraheavy particles may (or may not)
show up at the Large Hadron Collider (LHC) or a next-generation proton-proton
collider. If they do, they may provide new insights into the early universe and
fundamental physics.
