Vol. 298, No. 2, 2019

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Maximal symmetry and unimodular solvmanifolds

Michael Jablonski

Vol. 298 (2019), No. 2, 417–427

Recently, it was shown that Einstein solvmanifolds have maximal symmetry in the sense that their isometry groups contain the isometry groups of any other left-invariant metric on the given Lie group. Such a solvable Lie group is necessarily nonunimodular. In this work we consider unimodular solvable Lie groups and prove that there is always some metric with maximal symmetry. Further, if the group at hand admits a Ricci soliton, then it is the isometry group of the Ricci soliton which is maximal.

solvmanifold, solvable, Lie group, maximal symmetry, Ricci soliton, unimodular
Mathematical Subject Classification 2010
Primary: 22E25, 53C25, 53C30
Received: 19 March 2018
Revised: 25 July 2018
Accepted: 4 August 2018
Published: 8 March 2019
Michael Jablonski
Department of Mathematics
University of Oklahoma
Norman, OK
United States