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Axial algebras are non-associative algebras generated by semisimple idempotents, known as axes, that all obey a fusion rule. Axial algebras were introduced by Hall, Rehren and Shpectorov as a generalisation of the axioms of Majorana theory,…

Rings and Algebras · Mathematics 2018-10-02 Madeleine Whybrow

In the first half of this paper, we define axial algebras: nonassociative commutative algebras generated by axes, that is, semisimple idempotents---the prototypical example of which is Griess' algebra [C85] for the Monster group. When…

Rings and Algebras · Mathematics 2015-06-26 J. I. Hall , F. Rehren , S. Shpectorov

An axial algebra is a commutative non-associative algebra generated by axes, that is, primitive, semisimple idempotents whose eigenvectors multiply according to a certain fusion law. The Griess algebra, whose automorphism group is the…

Rings and Algebras · Mathematics 2020-09-25 Sanhan Khasraw , Justin McInroy , Sergey Shpectorov

Axial algebras are a class of commutative non-associative algebras which have a natural group of automorphisms, called the Miyamoto group. The motivating example is the Griess algebra which has the Monster sporadic simple group as its…

Rings and Algebras · Mathematics 2023-12-01 Ilya Gorshkov , Justin McInroy , Tendai Mudziiri Shumba , Sergey Shpectorov

We introduce decomposition algebras as a natural generalization of axial algebras, Majorana algebras and the Griess algebra. They remedy three limitations of axial algebras: (1) They separate fusion laws from specific values in a field,…

Rings and Algebras · Mathematics 2020-08-26 Tom De Medts , Simon F. Peacock , Sergey Shpectorov , Michiel Van Couwenberghe

Axial algebras are a class of commutative algebras generated by idempotents, with adjoint action semisimple and satisfying a prescribed fusion law. Axial algebras were introduced by Hall, Rehren, and Shpectorov in 2015 as a broad…

Rings and Algebras · Mathematics 2023-01-02 Andrey Mamontov , Alexey Staroletov

Axial algebras are a class of commutative non-associative algebras generated by idempotents, called axes, with adjoint action semi-simple and satisfying a prescribed fusion law. Axial algebras were introduced by Hall, Rehren and Shpectorov…

Rings and Algebras · Mathematics 2021-04-09 Alexey Galt , Vijay Joshi , Andrey Mamontov , Sergey Shpectorov , Alexey Staroletov

Nonassociative commutative algebras $A$ generated by idempotents $e$ whose adjoint operators ${\rm ad}_e\colon A \rightarrow A$, given by $x \mapsto xe$, are diagonalizable and have few eigenvalues are of recent interest. When certain…

Group Theory · Mathematics 2016-10-06 J. I. Hall , Y. Segev , S. Shpectorov

Axial algebras are a recently introduced class of non-associative algebra, with a naturally associated group, which generalise the Griess algebra and some key features of the moonshine VOA. Sakuma's Theorem classifies the eight…

Rings and Algebras · Mathematics 2020-12-01 Justin McInroy

Axial algebras are a class of non-associative commutative algebras whose properties are defined in terms of a fusion law. When this fusion law is graded, the algebra has a naturally associated group of automorphisms and thus axial algebras…

Rings and Algebras · Mathematics 2022-09-19 Justin McInroy , Sergey Shpectorov

Axial algebras are non-associative algebras generated by semisimple idempotents whose adjoint actions obey a fusion law. Axial algebras that are generated by two such idempotents play a crucial role in the theory. We classify all primitive…

Rings and Algebras · Mathematics 2020-05-08 Madeleine Whybrow

We study axial algebras, that is, commutative non-associative algebras generated by idempotents whose adjoint actions are semisimple and obey a fusion law. Considering the case, when said adjoint actions having $3$ eigenvalues and the…

Rings and Algebras · Mathematics 2024-10-04 Vsevolod A. Afanasev

Axial algebras of Monster type are a class of commutative algebras generated by special idempotents called axes. Some motivating examples of these algebras are the Griess algebra and the Norton-Sakuma algebras, relating to the Monster…

Rings and Algebras · Mathematics 2026-05-19 Clara Franchi , Mario Mainardis , Justin McInroy , Michael Turner

Axial algebras of Monster type are a class of non-associative algebras which generalise the Griess algebra, whose automorphism group is the largest sporadic simple group, the Monster. The $2$-generated algebras, which are the building…

Rings and Algebras · Mathematics 2026-01-01 Justin McInroy , Abdul Wajid Mir

Axial algebras are commutative algebras generated by idempotents; they generalise associative algebras by allowing the idempotents to have additional eigenvectors, controlled by fusion rules. If the fusion rules are $\mathbb{Z}/2$-graded,…

Rings and Algebras · Mathematics 2014-03-14 Felix Rehren

"Fusion rules" are laws of multiplication among eigenspaces of an idempotent. This terminology is relatively new and is closely related to axial algebras, introduced recently by Hall, Rehren and Shpectorov. Axial algebras, in turn, are…

Rings and Algebras · Mathematics 2021-11-17 Louis Rowen , Yoav Segev

A class of axial decomposition algebras with Miyamoto group generated by two Miyamoto automorphisms and three eigenvalues $0,1$ and $\eta$ is introduced and classified in the case with $\eta\notin\{0,1,\frac{1}{2}\}$. This class includes…

Rings and Algebras · Mathematics 2021-06-15 Takahiro Yabe

We introduce a class of algebras over a field $\mathbb{F}$ related to directed graphs in which all edges are labeled by nonzero elements of the field $\mathbb{F}$. If all labels are different from $1$, these algebras are axial algebras. We…

Commutative Algebra · Mathematics 2026-03-05 Hans Cuypers

"Fusion rules" are laws of multiplication among eigenspaces of an idempotent. This terminology is relatively new and is closely related to primitive axial algebras, introduced recently by Hall, Rehren, and Shpectorov. Axial algebras, in…

Rings and Algebras · Mathematics 2022-06-15 Louis Halle Rowen , Yoav Segev

An axial algebra over the field $\mathbb F$ is a commutative algebra generated by idempotents whose adjoint action has multiplicity-free minimal polynomial. For semisimple associative algebras this leads to sums of copies of $\mathbb F$.…

Rings and Algebras · Mathematics 2015-06-26 J I Hall , F Rehren , S Shpectorov
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