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The lattice thermal conductivity of crystalline Si nanowires is calculated.The calculation uses complete phonon dispersions, and does not require anyexternally imposed frequency cutoffs. No adjustment to nanowire thermalconductivity measurements is required. Good agreement with experimental resultsfor nanowires wider than 35 nm is obtained. A formulation in terms of thetransmission function is given. Also, the use of a simpler, nondispersive"Callaway formula", is discussed from the complete dispersions perspective.Comment: 4 pages, 3 figures. Accepted in Phys. Rev.

Calculation of Si nanowire thermal conductivity using complete phonon dispersion relations