On a Quaternionic Representation for Sp(4, R)

Details On a Quaternionic Representation for Sp(4, R) On a Quaternionic Representation for Sp(4, R)

2008-01-28

arxiv.org/abs/0801.4402v1

Physics

Mathematical Physics

21 pages;

Scientific paper

This work provides a quaternioinc reprsentation for real symplectic matrices in dimension four, analogous to the pair of unit quaternions representation for special orthogonal matrices. In the process of finding formulae for this representation in terms of the entries of the symplectic matrix being thereby represented, it shows how to compute the polar decomposition of a symplectic matrix without any need for spectral calculation. The technique just requires the solution of a simple 2x2 linear system. The work also characterizes symplectic, positive definite matrices in dimension four, and thus can be used in applications where the non-compact part of the symplectic group in dimension four is of utility.

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