The AirQuantumGrav campaign was flown by ESA to pursue the benefits of quantum technology for airborne gravimetry. The reference dataset captures gravity measurements from a cold-atom interferometer alongside the classical instrument data and navigation traces used to reduce them.
Why this dataset matters for the Center's work
For the Center, this is a well-characterised airborne gravity record against which the chronometric inversion can be tested away from the satellite regime. Earlier work recovered Earth's gravitational parameter from Galileo satellite clock data; that inversion lives in the chronometric kernel contributed to the DeepCausality physics crate. The Galileo case sits at orbital altitude with optical-clock precision. An airborne quantum gravimeter sits much closer to the surface, with different noise structure and a different signal envelope. Running the same chronometric pipeline against AirQuantumGrav lets the Center check that the method holds across different regimes.
Scope of the access
ESA's data access covers the AirQuantumGrav reference data for use in the Center's chronodynamics research. The work will proceed in the open; any code derived from the dataset that the Center contributes back to DeepCausality will land in the deep_causality repository under the open governance of the Linux Foundation for Data & AI, so the inversion remains reproducible by anyone who can obtain the same reference data from ESA.
Acknowledgements
The Center thanks the European Space Agency for granting access to the AirQuantumGrav reference data and for the broader scientific program that produced it. The Center for Dynamic Causality is an independent research organisation dedicated to the study of dynamic causality.