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Spherical Matrix Ensembles

The spherical orthogonal, unitary, and symplectic ensembles (SOE/SUE/SSE) $S_β(N,r)$ consist of $N \times N$ real symmetric, complex hermitian, and quaternionic self-adjoint matrices of Frobenius norm $r$, made into a probability space with the uniform measure on the sphere. For each of these ensembles, we determine the joint eigenvalue distribution for each $N$, and we prove the empirical spectral measures rapidly converge to the semicircular distribution as $N \to \infty$. In the unitary case ($β=2$), we also find an explicit formula for the empirical spectral density for each $N$.