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Aug 23, 2021 at 15:44 comment added hofnumber @PeterHumphries Many thanks for your comments. Much obliged!
Aug 23, 2021 at 12:59 comment added Peter Humphries This isn't known without recourse to the Ramanujan conjecture. The best that one can do unconditionally (so far) is $L(1,\mathrm{sym}^2 f) \ll \exp(C(\log q)^{1/2} (\log \log q)^{1/4})$ for some absolute constant $C > 0$ dependent on the spectral parameter of $f$. See Corollary 1 of "Upper Bounds on $L$-Functions at the Edge of the Critical Strip" by Xiannan Li.
Aug 23, 2021 at 5:42 history asked hofnumber CC BY-SA 4.0