Geodesic
Spectrum generating on twistor bundle
Archivum mathematicum, Tome 42 (2006) no. 5, pp. 169-183.

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Spectrum generating technique introduced by Ólafsson, Ørsted, and one of the authors in the paper (Branson, T., Ólafsson, G. and Ørsted, B., Spectrum generating operators, and intertwining operators for representations induced from a maximal parabolic subgroups, J. Funct. Anal. 135 (1996), 163–205.) provides an efficient way to construct certain intertwinors when $K$-types are of multiplicity at most one. Intertwinors on the twistor bundle over $S^1\times S^{n-1}$ have some $K$-types of multiplicity 2. With some additional calculation along with the spectrum generating technique, we give explicit formulas for these intertwinors of all orders.
Classification : 22E46, 53C28 
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     title = {Spectrum generating on twistor bundle},
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     zbl = {1164.53358},
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Branson, Thomas; Hong, Doojin. Spectrum generating on twistor bundle. Archivum mathematicum, Tome 42 (2006) no. 5, pp. 169-183. http://geodesic.mathdoc.fr/item/ARM_2006__42_5_a5/