E11 as E10 representation at low levels

Abstract

The Lorentzian Kac-Moody algebra E11, obtained by doubly overextending the compact E8, is decomposed into representations of its canonical hyperbolic E10 subalgebra. Whereas the appearing representations at levels 0 and 1 are known on general grounds, higher level representations can currently only be obtained by recursive methods. We present the results of such an analysis up to height 120 in E11 which comprises representations on the first five levels. The algorithms used are a combination of Weyl orbit methods and standard methods based on the Peterson and Freudenthal formulae. In the appendices we give all multiplicities of E10 occuring up to height 340 and for E11 up to height 240.

1+32 pages, 1 figure, LaTeX2e, uses longtable package;v2: corrected typo in formula and added references, results unchanged;v3: corrected reference [26]

References in corpus (3)

• E10 and a "small tension expansion" of M Theory
• Very Extended $E_8$ and $A_8$ at low levels, Gravity and Supergravity
• The Symmetry of M-Theories

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• Hidden Borcherds symmetries in Z_n orbifolds of M-theory and magnetized D-branes in type 0' orientifolds
• An algorithm for computing root multiplicities in Kac-Moody algebras