Harvard University                                CMSA Colloquium                       April 27, 2017

Levitation by Casimir Forces in and out of equilibrium


Summary

I.       Casimir force in QED:       

red ball High precision experimental precision achieved with scanning probes                        

      yellow ball Applications require control of this force, and its shape dependence

II.      Thermal Casimir force:   

red ball Critical Casimir force observed for colloids in a binary mixture    

III.    Repulsion/Levitation?

yellow ball Metamaterials, las invisibility cloaks:     

yellow ball Geometry: 

IV.   Earnshaw's theorem:       The Castle      

 red ball No levitation is possible with electrostatic interactions:  

red ball No levitation is possible with Casimir forces with dielectric composites: 

V.    Membranes inclusionse: Forces between inclusions due to membrane concentration fluctuations

                   

red ballConformal invariance enables computing forces for arbitrary shapes in any critical system.   

red ballRepulsion and stability with wedges:                     

VI.   Nonequilibrium Radiative force: Breakdown of classical "Stefan-Bolzmann" law

yellow ball Classical radiation pressure:        Hieronymus-Bosch,-The-Last-Judgement.-Central-Panel-with-Detail-of-Heaven

yellow ball Near field heat transfer:         yellow ball Levitation:         


Acknowledgments

Thosten Emig, Giuseppe Bimonte, Noah Graham, Robert Jaffe

Ramin Golestanian, Mark Hertzberg

Jamal Rahi, Mohammad Maghrebi

Vlad Golyk, Matthias Krüger