Equivalence and automorphism groups of two families of maximum scattered linear sets

TL;DR

This paper investigates the equivalence and automorphism groups of two known families of maximum scattered linear sets in projective spaces over finite fields, advancing understanding of their symmetries and classifications.

Contribution

It solves the equivalence problem and determines automorphism groups for two specific families of maximum scattered linear sets, which were previously only partially understood.

Findings

Classified the equivalence classes of the two families

Determined the automorphism groups of these linear sets

Enhanced understanding of their symmetry properties

Abstract

Linear set in projective spaces over finite fields plays central roles in the study of blocking sets, semifields, rank-metric codes and etc. A linear set with the largest possible cardinality and the maximum rank is called maximum scattered. Despite two decades of study, there are only a few number of known maximum scattered linear sets in projective lines, including the family constructed by Csajb\'ok, Marino, Polverino and Zanella 2018, and the family constructed by Csajb\'ok, Marino, Zullo 2018 (also Marino, Montanucci, and Zullo 2020). This paper aims to solve the equivalence problem of the linear sets in each of these families and to determine their automorphism groups.