Geodesic
The Laplace Operator Spectrum on Compact Simply Connected Rank Two Lie Groups
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 151 (2009) no. 4, pp. 15-35
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In the paper, we suggest an algorithm for calculation of the Laplace operator spectrum for real-valued functions defined on a compact simply connected simple Lie group with a bi-invariant Riemannian metric and establish a connection of the Ricci curvature of this metric with the spectrum. By means of the algorithm suggested and with the use of results of the number theory and the theory of integral binary quadratic forms, an explicit calculation of the spectrum for all compact simply connected simple Lie groups of rank two is given.
Keywords: Laplace operator, spectrum, group representation, Killing form, Ricci curvature. 
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     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
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V. N. Berestovskii; V. M. Svirkin. The Laplace Operator Spectrum on Compact Simply Connected Rank Two Lie Groups. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 151 (2009) no. 4, pp. 15-35. http://geodesic.mathdoc.fr/item/UZKU_2009_151_4_a2/

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