Discrepancy for convex bodies with isolated flat points

Luca Brandolini ^[1] ; Leonardo Colzani ^[2] ; Bianca Gariboldi ^[1] ; Giacomo Gigante ^[1] ; Giancarlo Travaglini ^[2]
1. [1] University of Bergamo
  
  University of Bergamo
  
  Bérgamo, Italia
2. [2] Università di Milano-Bicocca
Localización: Revista matemática iberoamericana, ISSN 0213-2230, Vol. 36, Nº 6, 2020, págs. 1597-1626
Idioma: inglés
DOI: 10.4171/rmi/1177
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Resumen
- We consider the discrepancy of the integer lattice with respect to the collection of all translated copies of a dilated convex body having a finite number of flat, possibly non-smooth, points in its boundary. We estimate the Lp norm of the discrepancy with respect to the translation variable, as the dilation parameter goes to infinity. If there is a single flat point with normal in a rational direction we obtain, for certain values of p, an asymptotic expansion for this norm. Anomalies may appear when two flat points have opposite normals. Our proofs depend on careful estimates for the Fourier transform of the characteristic function of the convex body.