  A search for signs of universal extra dimensions (UED) has been performed
with the D0 experiment, using events with two same-sign muons. The considered
minimal UED model includes one extra dimension, and has a stable lightest
Kaluza-Klein particle (LKP) which is a dark matter candidate. In the search,
7.3 fb^{-1} of D0 data, collected in p\bar{p} collisions at the Fermilab
Tevatron collider at \surd\bar{s} = 1.96 TeV, have been used.
