Simple one-dimensional model of heat conduction which obeys Fourier's law

We present the computer simulation results of a chain of hard-point particl es with alternating masses interacting on its extremes with two thermal bat hs at different temperatures. We found that the system obeys Fourier's law at the thermodynamic limit. This result is against the actual belief that o ne-dimensional systems with momentum conservative dynamics and nonzero pres sure have infinite thermal conductivity. It seems that thermal resistivity occurs in our system due to a cooperative behavior in which light particles tend to absorb much mure energy than the heavier ones.