Geodesic
On the average behavior of the Fourier coefficients of $j$th symmetric power $L$-function over certain sequences of positive integers
Czechoslovak Mathematical Journal, Tome 73 (2023) no. 3, pp. 885-901
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We investigate the average behavior of the $n$th normalized Fourier coefficients of the $j$th ($j \geq 2$ be any fixed integer) symmetric power $L$-function (i.e., $L(s,{\rm sym}^{j}f)$), attached to a primitive holomorphic cusp form $f$ of weight $k$ for the full modular group $SL(2,\mathbb {Z})$ over certain sequences of positive integers. Precisely, we prove an asymptotic formula with an error term for the sum $$ S_j^*:= \sum_{a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}+a_{6}^{2}\leq x (a_{1},a_{2},a_{3},a_{4},a_{5},a_{6})\in \mathbb {Z}^{6}} \lambda ^{2}_{{\rm sym}^{j}f}(a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}+a_{6}^{2}), $$ where $x$ is sufficiently large, and $$ L(s,\mathrm{sym}^{j}f):=\sum _{n=1}^{\infty }\frac {\lambda_{\mathrm{sym}^{j}f}(n)}{n^{s}}. $$ When $j=2$, the error term which we obtain improves the earlier known result.
We investigate the average behavior of the $n$th normalized Fourier coefficients of the $j$th ($j \geq 2$ be any fixed integer) symmetric power $L$-function (i.e., $L(s,{\rm sym}^{j}f)$), attached to a primitive holomorphic cusp form $f$ of weight $k$ for the full modular group $SL(2,\mathbb {Z})$ over certain sequences of positive integers. Precisely, we prove an asymptotic formula with an error term for the sum $$ S_j^*:= \sum_{a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}+a_{6}^{2}\leq x (a_{1},a_{2},a_{3},a_{4},a_{5},a_{6})\in \mathbb {Z}^{6}} \lambda ^{2}_{{\rm sym}^{j}f}(a_{1}^{2}+a_{2}^{2}+a_{3}^{2}+a_{4}^{2}+a_{5}^{2}+a_{6}^{2}), $$ where $x$ is sufficiently large, and $$ L(s,\mathrm{sym}^{j}f):=\sum _{n=1}^{\infty }\frac {\lambda_{\mathrm{sym}^{j}f}(n)}{n^{s}}. $$ When $j=2$, the error term which we obtain improves the earlier known result.
DOI : 10.21136/CMJ.2023.0348-22
Classification : 11F11, 11F30, 11M06
Keywords: nonprincipal Dirichlet character; Hölder's inequality; $j$th symmetric power $L$-function; holomorphic cusp form 
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     title = {On the average behavior of the {Fourier} coefficients of $j$th symmetric power $L$-function over certain sequences of positive integers},
     journal = {Czechoslovak Mathematical Journal},
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     year = {2023},
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Sharma, Anubhav; Sankaranarayanan, Ayyadurai. On the average behavior of the Fourier coefficients of $j$th symmetric power $L$-function over certain sequences of positive integers. Czechoslovak Mathematical Journal, Tome 73 (2023) no. 3, pp. 885-901. doi: 10.21136/CMJ.2023.0348-22

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