A "COHERENT STATE TRANSFORM" APPROACH TO DERIVATIVE PRICING

We propose an extension of the transform approach to option pricing introduced in Duffie, Pan and Singleton (Econometrica68(6) (2000) 1343–1376) and in Carr and Madan (Journal of Computational Finance2(4) (1999) 61–73). We term this extension the "coherent state transform" approach, it applies when the Markov generator of the factor process can be decomposed as a linear combination of generators of a Lie symmetry group. Then the family of group invariant coherent states determine the transform to price derivatives. We exemplify this procedure deriving a coherent state transform for affine jump-diffusion processes with positive state space. It improves the traditional FFT because inversion of the latter requires integration over an unbounded domain, while inversion of the coherent state transform requires integration over unit ball. We explicitly perform the pricing exercise for some contracts like the plain vanilla options on (credit) risky bonds and on the spread option.