Doctor Who actor reprises vintage villain for unexpectedly fun charity cameo

Dean Hollingsworth, known for his role in Doctor Who, recently brought back a lesser-known villain from the show’s history to help raise money for charity during the holidays.



![The model demonstrates how equilibrium policies-specifically [latex]\widehat{\pi}(t,y)[/latex]-and preference-hedging demand shift in response to varying levels of systematic risk, illustrated by parameters [latex]\mu_{Y} = 0.02[/latex] and [latex]\mu_{Y} = -0.02[/latex], under conditions defined by [latex](r,\mu_{S},\sigma_{S},\sigma_{Y},\rho,\exp(y_{0}))=(0.02,0.07,0.2,0.04,0.6,2)[/latex], revealing the inherent sensitivity of optimal control to even subtle changes in perceived market dynamics.](https://arxiv.org/html/2512.21149v1/prefhedging_negative_muy_positive_rho.png)



