A numerically exact dynamical quantum Monte Carlo approach has been developed
and applied to transport through a double barrier in a Luttinger liquid with
arbitrary transmission. For strong transmission, we find broad Fabry-Perot
Coulomb blockade peaks, with a lineshape parametrized by a single parameter,
but at sufficiently low temperatures, non-Lorentzian universal lineshapes
characteristic of coherent resonant tunneling emerge, even for strong
interactions. For weak transmission, our data supports the recently proposed
correlated sequential tunneling picture and is consistent with experimental
results on intrinsic nanotube dots.Comment: 4 pages, 4 figure