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VIDEO LIBRARY |
À.A.Karatsuba's 80th Birthday Conference in Number Theory and Applications
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On the fractional moments of some mollified arithmetical Dirichlet series S. A. Gritsenko Lomonosov Moscow State University, Faculty of Mechanics and Mathematics |
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Abstract: In 2002, A.A. Karatsuba demonstrated that the true order of fractional moments of some Dirichlet series allows one to obtain the estimate for the number of zeta-function zeros on the critical line which is more precise than the estimate of G. Hardy and J. Littlewood (1921). In 2017, the author has found the true order lower and upper estimates for some mollified $$ \int_{T}^{2T}\bigl|L\bigl(\tfrac{1}{2}+it,\chi\bigr)\phi\bigl(\tfrac{1}{2}+it\bigr)\bigr|^{2k}dt, $$ where the function The exponent Our main result is the following. Suppose that $$ \sum_{\nu=1}^{\infty}\frac{\alpha(\nu)}{\nu^{s}}\,=\, \prod\limits_{p\equiv\pm 1(\mmod 5)}\biggl(1-\frac{1}{2vp^{s}}\biggr)\!\!\prod\limits_{p\equiv\pm 2(\mmod 5)}\biggl(1-\frac{\varepsilon}{p^{s}}\biggr), $$ \begin{equation*} \beta(\nu)\,=\, \begin{cases} \displaystyle \alpha(\nu)\chi_{1}(\nu)\biggl(1-\frac{\log{\nu}}{\log X\mathstrut }\biggr), & \text{if}\;\;\nu<X,\\ 0, & \text{if}\;\;\nu\ge X, \end{cases} \end{equation*} where $$ \varphi\bigl(\tfrac{1}{2}+it\bigr)\,=\,\sum_{\nu<X}\frac{\beta(\nu)}{\nu^{\,1/2+it}},\quad \phi\bigl(\tfrac{1}{2}+it\bigr)=\bigl(\varphi\bigr(\tfrac{1}{2}+it\bigr)\bigr)^{2v}. $$ theorem. The following estimates hold true: \begin{multline*} T(\log T)^{(1+2\varepsilon v)^{2}/(2v^2)}\ll \int_T^{2T}\bigl|L\bigl(\tfrac{1}{2}+it,\overline{\chi}_{1}\bigr)\phi\bigl(\tfrac{1}{2}+it\bigr)\bigr|^{2/v}dt\ll\\ \ll T(\log T)^{(1+2\varepsilon v)^{2}/(2v^2)},\\ \int_T^{2T}\bigr|L\bigl(\tfrac{1}{2}+it,\chi_{1}\bigr)\phi\bigl(\tfrac{1}{2}+it\bigr)\bigr|^{2/v}dt\ll T(\log T)^{(1-2\varepsilon v)^{2}/(2v^2)},\\ \int_T^{2T}\bigr|L\bigl(\tfrac{1}{2}+it,\overline{\chi}_{1}\bigr)\phi\bigl(\tfrac{1}{2}+it\bigr)\bigr|dt\ll T(\log T)^{(1+2\varepsilon v)^{2}/8},\\ \int_T^{2T}\bigl|L\bigl(\tfrac{1}{2}+it,\chi_{1}\bigr)\phi\bigl(\tfrac{1}{2}+it\bigr)\bigr|dt\ll T(\log T)^{(1-2\varepsilon v)^{2}/8}. \end{multline*} Denote by $$ N_{0}(2T)\,-\,N_{0}(T)\,\gg\,T(\log T)^{1/2+1/12-\varepsilon}. $$ Language: English |