  We consider a decay of a false vacuum in flux compactifications of type IIB
string theory and study a catalytic effect for a phase transition induced by a
new type of impurities. We concentrate on the large N dual of a
D5-brane/anti-D5-brane system which has a rich vacuum structure. We show that
D3-branes wrapping the 3-cycles can form a dibaryon and make a bound state with
a monopole. We find that these baryon-like objects can make the lifetime of the
metastable vacuum shorter.
