The sharp refined Bohr inequalities for a subclass of close-to-convex harmonic mappings

Abstract

Let $\mathcal{H}$ be the class of normalized complex valued harmonic functions $ f = h + \overline{g}$ defined on the unit disk $\mathbb{D}$, where $h$ and $g$ are analytic functions with the normalization conditions $h(0) = h&#39;(0) - 1 = 0$ and $g(0) = 0$. For the class $R_H^{0}(γ, δ, λ)$ ( $0 \leq λ< γ\leq δ$) consisting of functions \( f = h+\bar{g} \in \mathcal{H}\) satisfying the condition $f_{\overline{z}}(0)=0$ and the inequality $ Re(γh&#39;(z)+δz h&#39;&#39;(z) +(\frac{δ- γ}{2})z^2 h&#39;&#39;&#39;(z)-λ)> |γg&#39;(z)+δz g&#39;&#39;(z) +(\frac{δ- γ}{2})z^2 g&#39;&#39;&#39;(z)|$, we obtain sharp improved Bohr Phenomenon, refined Bohr radius and the Bohr-Rogosinski inequality for the class $R_H^{0}(γ, δ, λ)$.