Torsion-balance tests of the weak equivalence principle · HackerPapers discussions

Torsion-balance tests of the weak equivalence principle — mentioned by ISL

Thu, 08 Apr 2021 01:08:34 GMT

Yes. This would be extremely helpful for experimentalists who spend a lot of their time pointing out, for example, that one's new theory can't violate the equivalence principle by very much at all. Similarly, it would be helpful for people planning new experiments to know whether or not their proposed experiment will probe new ground (i.e. CERN's anti-hydrogen experiments are of intense value for spectroscopic studies, but existing experiments [1] show that antimatter, at the 10^-8 level or better, obeys the equivalence principle and therefore will reliably fall in every experiment of which…

Paper and discussion history. A mention is not an endorsement.

Torsion-balance tests of the weak equivalence principle — mentioned by ISL

Thu, 31 Oct 2019 06:15:00 GMT

We have already tested the equivalence principle toward dark matter [1]. It appears to fall like everything else, at the 1% or better level. It is extremely difficult for modifications of gravity to simultaneously fit the cosmic microwave background, big-bang nucleosynthesis, galactic rotation curves, and the Bullet Cluster. The safe bet these days is on some sort of non-baryonic dark particle (which is why so many people are looking for them). Most other loopholes are closed or in the process of being closed. The coming decade or two should have something significant to say about dark…

Paper and discussion history. A mention is not an endorsement.

Torsion-balance tests of the weak equivalence principle — mentioned by ISL

Sat, 13 Oct 2018 13:55:06 GMT

Moreover, locally, it is expected to be approximately uniform in density, which makes any gravitational interaction negligible. Nevertheless, our gravitational experiments can say things about the properties of dark matter (it generally obeys the Equivalence Principle): https://arxiv.org/abs/1207.2442 Furthermore, for certain classes of ultra-light dark matter, gravitational and spin-coupled searches can have something to say, e.g.: https://arxiv.org/abs/1512.06165 We're trying.

Paper and discussion history. A mention is not an endorsement.