

A287944


Theta series of the 42dimensional lattice of hyperroots A_5(SU(3)).


9




OFFSET

0,4


COMMENTS

This lattice is the k=5 member of the family of lattices of SU(3) hyperroots associated with the fusion category A_k(SU(3)).
Simple objects of the latter are irreducible integrable representations of the affine Lie algebra of SU(3) at level k.
With k=5 there are r=(k+1)(k+2)/2=21 simple objects. The rank of the lattice is 2r=42.
The lattice is defined by 2r(k+3)^2/3=896 hyperroots of norm 6 which are also the vectors of shortest length. Minimal norm is 6. Det =(k+3)^(3(k+1)) = 8^18.
The lattice is rescaled (q > q^2): its theta function starts as 1 + 896*q^6 + 11856*q^8 +... See example.


LINKS

Table of n, a(n) for n=0..8.
R. Coquereaux, Theta functions for lattices of SU(3) hyperroots, arXiv:1708.00560[math.QA], 2017.
A. Ocneanu, The Classification of subgroups of quantum SU(N), in "Quantum symmetries in theoretical physics and mathematics", Bariloche 2000, Eds. R. Coquereaux, A. Garcia. and R. Trinchero, AMS Contemporary Mathematics, 294, pp. 133160, (2000). End of Sec 2.5.


EXAMPLE

G.f. = 1 + 896*x^3 + 11856*x^4 + 154368*x^5 + ...
G.f. = 1 + 896*q^6 + 11856*q^8 + 154368*q^10 + ...


CROSSREFS

Cf. A008434. {D_6}^{+} lattice is rescaled A_1(SU(3)).
Cf. A290654 is A_2(SU(3)). Cf. A290655 is A_3(SU(3)). Cf. A287329 is A_4(SU(3). Cf. A288488, A288489, A288776, A288779, A288909.
Sequence in context: A251315 A218814 A264329 * A323964 A145498 A252378
Adjacent sequences: A287941 A287942 A287943 * A287945 A287946 A287947


KEYWORD

nonn,more


AUTHOR

Robert Coquereaux, Sep 01 2017


STATUS

approved



