Peak solutions for the fractional Nirenberg problem

We consider the fractional Nirenberg problem (−Δ)γu=K̃uN+2γN−2γ, u>0u>0 in RNRN. Assume K̃(x)=1+εK(x) and K(x)K(x) has at least two critical points satisfying some local conditions, the existence of two-peak solutions is obtained when the positive number εε is small enough.