  In cold compact stars, Cooper pairing between fermions in dense matter leads
to the formation of a gap in their excitation spectrum and typically
exponentially suppresses transport properties. However, we show here that weak
Urca reactions become strongly enhanced and approach their ungapped level when
the star undergoes density oscillations of sufficiently large amplitude. We
study both the neutrino emissivity and the bulk viscosity due to direct Urca
processes in hadronic, hyperonic and quark matter and discuss different
superfluid and superconducting pairing patterns.
