Unitary transform diagonalizing the confluent hypergeometric kernel

We consider the image of the operator inducing the determinantal point process with confluent hypergeometric kernel. The space is described as the image of L₂[0, 1] under a unitary transformation generalizing the Fourier transform. For the derived transformation we prove a counterpart of the Paley-Wiener theorem. We use this theorem to prove that the corresponding analogue of the Wiener-Hopf operator is a unitary equivalent of the usual Wiener-Hopf operator, which implies that it shares the same factorization properties and Widom's trace formula. Finally, using the transformation introduced we present explicit formulae for the hierarchical decomposition of the image of the operator induced by the confluent hypergeometric kernel. Bibliography: 23 titles.