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Densities for rough differential equations under Hörmander's condition

2010
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Annals of Mathematics
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We consider stochastic differential equations d Y D V .Y / dX driven by a multidimensional Gaussian process X in the rough path sense [T. Lyons, Rev. Mat. Iberoamericana 14, (1998), 215-310]. Using Malliavin Calculus we show that Y t admits a density for t 2 .0; T provided (i) the vector fields V D .V 1 ; : : : ; V d / satisfy Hörmander's condition and (ii) the Gaussian driving signal X satisfies certain conditions. Examples of driving signals include fractional Brownian motion with Hurst

doi:10.4007/annals.2010.171.2115
fatcat:b5aadp2dxndgpe7glkfkbiz7g4