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Apr 12, 2016 at 20:08 comment added Yufei Zhao I don't have a good answer I'm afraid. Our intuition for how packings work in high dimensions is rather poor. As far as I know, there is no proof that $\Delta_{n+1} \le \Delta_n$ for all sufficiently large $n$. Even if you know a good packing in $n$ dimensions, you might not get a good packing by tiling it in one higher dimension (although this strategy works well in low dimensions). See Conway and Sloane for a lot more.
Apr 12, 2016 at 14:43 comment added user88381 Thanks for this answer. I was wondering, is there an intuitive answer for why the densest packing density decreases with dimension?
Apr 5, 2016 at 21:07 vote accept Archie
Apr 5, 2016 at 19:54 history edited Yufei Zhao CC BY-SA 3.0
updated link to slides
Apr 5, 2016 at 18:03 history answered Yufei Zhao CC BY-SA 3.0