Division algebras with integral elements

Mehmet Kocat*, Nazife Ozdes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Pairing two elements of a given division algebra furnished with a multiplication rule leads to an algebra of higher dimension restricted by 8. This fact is used to obtain the roots of SO(4)and SP(2) from the roots ⫦ of SU(2) and the weights⫦ ½ its spinor representation. The root lattic of SO(8) described by 24 integral quaternions are obtained by pairing two sets of roots of SP(2). The root system of F4 is constructed in terms of 24 integral and 24‘half integral’ quaternions. Th root lattice of E, expressed as 240 integral octonions are obtainedby pairing two sets of roots o F4. Twenty four integral quaternions of SO(8) forming a discrete subgroup of SU(2) are shown to be the automorphism group of the root latticesof SO(8), F4 and E8. The roots of maximal subgroups SO 16), E8 Ö SU(2), E8 Ö SU(3), SU(9) and SU(5) Ö SU(5) of E8 are identified witha simple method. Subsets of the discrete subgroup of SU(2) leaving maximal subgroups of E, are obtained. Constructions of E, root lattice with integral octonions in seven distinct ways are made. Magic squares of integral lattices of Goddard, Nahm, Olive, Ruegg and Schwimmer are derived. Possible physical applications are suggested.

Original languageEnglish
Pages (from-to)1469-1493
Number of pages25
JournalJournal of Physics A: Mathematical and General
Issue number10
Publication statusPublished - May 21 1989
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • General Physics and Astronomy


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