TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.14.035
TI  - Vinberg's T-algebras: From exceptional periodicity to black hole entropy
PY  - 2023/11/24
UR  - https://scipost.org/SciPostPhysProc.14.035
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 14
SP  - 035
A1  - Marrani, Alessio
AB  - We introduce the so-called Magic Star (MS) projection within the root lattice of finite-dimensional exceptional Lie algebras, and relate it to rank-3 simple and semi-simple Jordan algebras. By relying on the Bott periodicity of reality and conjugacy properties of spinor representations, we present the so-called Exceptional Periodicity (EP) algebras, which are finite-dimensional algebras, violating the Jacobi identity, and providing an alternative with respect to Kac-Moody infinite-dimensional Lie algebras. Remarkably, also EP algebras can be characterized in terms of a MS projection, exploiting special Vinberg T-algebras, a class of generalized Hermitian matrix algebras introduced by Vinberg in the '60s within his theory of homogeneous convex cones. As physical applications, we highlight the role of the invariant norm of special Vinberg T-algebras in Maxwell-Einstein-scalar theories in 5 space-time dimensions, in which the Bekenstein-Hawking entropy of extremal black strings can be expressed in terms of the cubic polynomial norm of the T-algebras.
ER  -

@Article{10.21468/SciPostPhysProc.14.035,
	title={{Vinberg's T-algebras: From exceptional periodicity to black hole entropy}},
	author={Alessio Marrani},
	journal={SciPost Phys. Proc.},
	pages={035},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.14.035},
	url={https://scipost.org/10.21468/SciPostPhysProc.14.035},
}