Improved results on the oscillation of the modulus of the Rudin-Shapiro polynomials on the unit circle

20 Sep 2018 Erdélyi Tamás

Let either $R_k(t) := |P_k(e^{it})|^2$ or $R_k(t) := |Q_k(e^{it})|^2$, where $P_k$ and $Q_k$ are the usual Rudin-Shapiro polynomials of degree $n-1$ with $n=2^k$. In a recent paper we combined close to sharp upper bounds for the modulus of the autocorrelation coefficients of the Rudin-Shapiro polynomials with a deep theorem of Littlewood to prove that there is an absolute constant $A>0$ such that the equation $R_k(t) = (1+\eta )n$ has at least $An^{0.5394282}$ distinct zeros in $[0,2\pi)$ whenever $\eta$ is real and $|\eta| < 2^{-11}$... (read more)

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