Einstein’s equivalence principle states that an object in gravitational free fall is physically equivalent to an object that is accelerating with the same amount of force in the absence of gravity. This principle lies at the heart of general relativity and has been experimentally tested many times. Now in a new paper, scientists have experimentally demonstrated a conceptually new way to test the equivalence principle that could detect the effects of a relatively new concept called spin-gravity coupling.
The study, by M. G. Tarallo, et al., is published in a recent issue of Physical Review Letters.
“Testing the equivalence principle, or the equivalence of inertial mass and gravitational mass, means testing the validity of one of the fundamental principles of general relativity,” coauthor Guglielmo Tino, Professor at the University of Florence, INFN, told Phys.org. “In our experiment, we use a quantum sensor to investigate gravitational interaction; this allowed us to search for new effects.”
Read more at: Phys.org