GRAVITATIONAL AND COSMOLOGICAL CONSTANT MEASUREMENTS
Vahagn Gurzadyan, Doctor of Physical and Mathematical Sciences, Professor, and Head of the Center for Cosmology and Astrophysics at the A. I. Alikhanyan National Science Laboratory, together with international collaborators, has published an article titled “Probing lambda-gravity with Bose–Einstein condensates” in the prestigious journal Physical Review Research (Letters).
A precise test is proposed for two fundamental gravitational constants using a detector concept that exploits the dynamics of quantum phononic excitations in a trapped Bose-Einstein condensate (BEC), operable at the scale of tabletop experiments. In this setup, the sensitivity is enhanced by approximately 2 orders of magnitude through the use of a tritter operation, which mixes phononic excitations with the BEC's ground state. The BEC exhibits unique sensitivity to the two key components of the gravitational potential in Λ-gravity: the Newtonian constant G and the cosmological constant Λ.
Using state-of-the-art experimental design, we predict that the gravitational constant G could be measured with an accuracy up to 10^−17N m^2/kg^2, representing an improvement by 2 orders of magnitude over current measurements. Moreover, this experiment aims to establish the best Earth-based upper limit on Λ at <10^−31 m^−2, marking the first laboratory-based probe of the cosmological constant.
Full article: https://journals.aps.org/prresearch/abstract/10.1103/7x8h-t1l9
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