Analogues of Herglotz-Zagier-Novikov function
Recently, Choie and Kumar extensively studied the Herglotz-Zagier-Novikov function $\mathcal{F}(z;u,v)$, defined as \begin{align*}\mathcal{F}(z;u,v) = \int_{0}^{1} \frac{\log(1-ut^z)}{v^{-1}-t} dt, \quad \mathrm{for} \,\,\,\, \mathfrak{Re}(z)>0.\end{align*}They obtained two-term, three-term and six-term functional equations for $\mathcal{F}(z;u,v)$ and also evaluated special values in terms of di-logarithmic functions. Motivated from their work, we study the following two integrals, \begin{align*}\mathcal{F}(z;u,v,w) &=\int_{0}^1 \frac{\log(1-ut^z)\log(1-wt^z)}{v^{-1}-t}\text{d}t, \\mathcal{F}_k(z;u,v) &= \int_{0}^{1} \frac{\log^k(1-ut^z)}{v^{-1}-t} \, \text{d}t,\end{align*}for $\mathfrak{Re}(z)>0$ and $k \in \mathbb{N}$. For $k=1$, the integral $\mathcal{F}_k(z;u,v)$ reduces to $\mathcal{F}(z;u,v)$. This allows us to recover the properties of $\mathcal{F}(z;u,v)$ by studying the properties of $\mathcal{F}_k(z;u,v)$. We evaluate special values of these two functions in terms of poly-logarithmic functions.
Authors
- Bibekananda Maji (ORCID: https://orcid.org/0000-0003-2155-2480)
- Pragya Singh (ORCID: https://orcid.org/0000-0002-0631-3871)
- Diksha Rani Bansal (ORCID: https://orcid.org/0009-0004-1096-2948)
Institutions
- Ahmedabad University (IN)
- Indian Institute of Technology Indore (IN)
Publication Details
- Journal
- Hardy-Ramanujan Journal
- Published
- 2026-04-27
- DOI
- https://doi.org/10.46298/hrj.2026.17912
- Primary Topic
- Functional Equations Stability Results
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Science and Engineering Research Board