Nikolskii inequality for lacunary spherical polynomials
Abstract
We prove that for $d\ge 2$, the asymptotic order of the usual Nikolskii inequality on $\mathbb{S}^d$ (also known as the reverse Hölder's inequality) can be significantly improved in many cases, for lacunary spherical polynomials of the form $f=\sum_{j=0}^m f_{n_j}$ with $f_{n_j}$ being a spherical harmonic of degree $n_j$ and $n_{j+1}-n_j\ge 3$. As is well known, for $d=1$, the Nikolskii inequality for trigonometric polynomials on the unit circle does not have such a phenomenon.
- Publication:
-
arXiv e-prints
- Pub Date:
- May 2019
- arXiv:
- arXiv:1905.00323
- Bibcode:
- 2019arXiv190500323D
- Keywords:
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- Mathematics - Classical Analysis and ODEs;
- 33C55;
- 33C50;
- 42B15;
- 42C10
- E-Print:
- 6 pages