A ternary diophantine inequality by primes with one of the form $\mathbf{p}={\mathbf{x}}^2+{\mathbf{y}}^2+1$

Abstract

In this paper we solve the ternary Piatetski-Shapiro inequality with prime numbers of a special form. More precisely we show that, for any fixed $1<c<\frac{427}{400}$, every sufficiently large positive number $N$ and a small constant $\epsilon >0$, the diophantine inequality \begin{equation*} |p_1^c+p_2^c+p_3^c-N|<\varepsilon \end{equation*} has a solution in prime numbers $p_1,p_2,p_3$, such that $p_1=x^2+y^2+1$. For this purpose we establish a new Bombieri -- Vinogradov type result for exponential sums over primes.