TY - JOUR

T1 - Miyamoto involutions in axial algebras of Jordan type half

AU - Hall, Jonathan I.

AU - Segev, Yoav

AU - Shpectorov, Sergey

N1 - Publisher Copyright:
© 2018, Hebrew University of Jerusalem.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - Nonassociative commutative algebras A, generated by idempotents e whose adjoint operators ade: A → A, given by x ↦ xe, are diagonalizable and have few eigenvalues, are of recent interest. When certain fusion (multiplication) rules between the associated eigenspaces are imposed, the structure of these algebras remains rich yet rather rigid. For example, vertex operator algebras give rise to such algebras. The connection between the Monster algebra and Monster group extends to many axial algebras which then have interesting groups of automorphisms. Axial algebras of Jordan type η are commutative algebras generated by idempotents whose adjoint operators have a minimal polynomial dividing (x-1)x(x-η), where η ∉ {0, 1} is fixed, with well-defined and restrictive fusion rules. The case of η ≠1/2 was thoroughly analyzed by Hall, Rehren and Shpectorov in a recent paper, in which axial algebras were introduced. Here we focus on the case where η = 1/2, which is less understood and is of a different nature.

AB - Nonassociative commutative algebras A, generated by idempotents e whose adjoint operators ade: A → A, given by x ↦ xe, are diagonalizable and have few eigenvalues, are of recent interest. When certain fusion (multiplication) rules between the associated eigenspaces are imposed, the structure of these algebras remains rich yet rather rigid. For example, vertex operator algebras give rise to such algebras. The connection between the Monster algebra and Monster group extends to many axial algebras which then have interesting groups of automorphisms. Axial algebras of Jordan type η are commutative algebras generated by idempotents whose adjoint operators have a minimal polynomial dividing (x-1)x(x-η), where η ∉ {0, 1} is fixed, with well-defined and restrictive fusion rules. The case of η ≠1/2 was thoroughly analyzed by Hall, Rehren and Shpectorov in a recent paper, in which axial algebras were introduced. Here we focus on the case where η = 1/2, which is less understood and is of a different nature.

UR - http://www.scopus.com/inward/record.url?scp=85035116046&partnerID=8YFLogxK

U2 - 10.1007/s11856-017-1615-7

DO - 10.1007/s11856-017-1615-7

M3 - Article

AN - SCOPUS:85035116046

VL - 223

SP - 261

EP - 308

JO - Israel Journal of Mathematics

JF - Israel Journal of Mathematics

SN - 0021-2172

IS - 1

ER -