Alex Sushkov Abstract

Alex Sushkov
Harvard University

"Studying short-range quantum forces with a torsion pendulum"

ABSTRACT:

Using a torsion balance, we measure forces between macroscopic bodies at separations on the order of a micron. Measurements with Au-coated plates detect the Casimir effect due to quantum fluctuations of the electromagnetic field, as well as the thermal Casimir effect, due to thermal fluctuations, and confirm the validity of the Drude model of permittivity dispersion used in Casimir force calculations. I will discuss some claims that this model contradicts the Third Law of thermodynamics. I will also discuss the electrostatic forces due to potential patches on the metal surfaces. We use our measurements to place new upper bounds on short-range exotic forces, arising, for example, in quantum graviity theories with extra dimensions.