Physics talk with an emphasis on Mathematics I have to give a 10 minute physics talk that have to involve a fair bit of mathematics -- i.e. not just qualitative/handwaving material to some undergrads. I have wasted the last 3 hours looking for appropriate topics and have pretty much lost the will to live. Any suggestions would be greatly appreciated.
 A: As a materials scientist I'm a bit biased, but I think that the Johnson-Mehl-Avrami-Kolmogorov  kinetics of phase changes/crystal growth is one of the coolest mathematical physics talks that can be covered in 10 minutes. The wikipedia article is accurate, but not as enlightening as I'd like. My favorite introductory discussion appears in Kinetics of Materials by Baluffi, Allen, and Carter. I can't send that to you, but Craig Carter's lecture notes  aren't a bad place to start. John Cahn's extension of this approach by the method of time cones has really nice parallels to special relatively (weird, right?) and could add some sparkle to a talk for undergrads. Let me know if this is something you'd be interested in pursuing and I can provide additional guidance/information.
A: Just an idea that I have used once in a somewhat similar situation: 
Explain the Casimir force and then "derive" it using  analytic continuation of Riemann zeta function:   $\sum_n n^3 \stackrel{!}{=} \zeta(-3) =1/120$. Depending on your audience, emphasis more physics or math. You probably should include an experimental graph confirming the pre-factor. This trick usually provokes quite a few questions.
