An Improved Leray-Trudinger Inequality

Abstract: In this article, we have derived the following Leray-Trudinger type inequality on a bounded domain $\Omega$ in $\mathbb{R}^n $ containing the origin. \begin{align*} \displaystyle{\sup_{u\in W^{1,n}_{0}(\Omega), I_{n}[u,\Omega,R]\leq 1}}\int_{\Omega} e^{c_n\left(\frac{|u(x)|}{E_{2}^{\beta}(\frac{|x|}{R})}\right)^{\frac{n}{n-1}}} dx < +\infty \ \text{, for some } c_n>0 \ \text{depending only on } n. \end{align*} Here $\beta = \frac{2}{n}$, $I_n[u,\Omega,R] := \int_{\Omega}|\nabla u |^{n}dx- \left(\frac{n-1}{n}\right)^{n}\int_{\Omega}\frac{|u|^{n}}{|x|^{n}E_{1}^n(\frac{|x|}{R})}dx $, $R \geq \displaystyle{\sup_{x\in \Omega}}|x|$ and $E_{1}(t) := \log(\frac{e}{t})$, $E_{2}(t) := \log(eE_1(t))$ for $t\in (0,1].$ This improves an earlier result by Psaradakis and Spector. Also we have proved that, for any $c>0$ the above inequality is false, if we take $\beta < \frac{1}{n}.$