On the ternary Goldbach problem with primes in independent arithmetic   progressions
  We show that for every fixed $A>0$ and $\theta>0$ there is a   $\vartheta=\vartheta(A,\theta)>0$ with the following property.   Let $n$ be odd and sufficiently large, and let   $Q_{1}=Q_{2}:=n^{\h}(\log n)^{-\vartheta}$ and $Q_{3}:=(\log n)^{\theta}$. Then for all $q_{3}\leq Q_{3}$, all reduced residues $a_{3}$ mod $q_{3}$, almost all $q_{2}\leq Q_{2}$, all admissible residues $a_{2}$ mod $q_{2}$, almost all $q_{1}\leq Q_{1}$ and all admissible residues $a_{1}$ mod $q_{1}$, there exists a representation $n=p_{1}+p_{2}+p_{3}$ with primes $p_{i}\equiv a_{i} (q_{i})$, $i=1,2,3$. 
Karin Halupczok