Recorded 28 January 2025. Basile Gallet of CEA - Saclay presents "Diffusivity-free rotating convection in the laboratory" at IPAM's Rotating Turbulence: Interplay and Separability of Bulk and Boundary Dynamics Workshop. Abstract: I will discuss rapidly rotating radiatively driven thermal convection, based on a combination of laboratory experiments and direct numerical simulations (DNS). I will report the simultaneous validation of the scaling predictions of the `geostrophic turbulence' regime - the diffusivity-free or `ultimate' regime of rapidly rotating convection - for the heat transport, the temperature fluctuations, the flow speed and the characteristic horizontal scale. Radiatively driven convection appears as a versatile setup for the laboratory observation of the diffusivity-free regimes of various convective flows of geophysical and/or astrophysical interest. Learn more online at: https://www.ipam.ucla.edu/programs/workshops/rotating-turbulence-interplay-and-separability-of-bulk-and-boundary-dynamics/