Abstract
An influence of ambipolar diffusion on turbulent pressure ( P t ) evolution in collapsing molecular cloud cores is investigated analytically. Exact solution for Alfven waves in free collapsing weakly ionized slab is found and then used to derive an equation for P t . Taking ambipolar diffusion into account, we show that the pressure-density relation P t ( ) is non-power-law in general, and can be much softer than P t 3/2 .
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