This recent presentation from Kepler Airospace claims that Einstein was on the right track and a goes even further, stating that gravity can be manipulated through EM. I've graduated in Physics but not quite sure what to make of it.
I'm cheering them on, but I'm not confident that the technology works, based on the people involved. I don't think the new physics underlying this work are published in a peer-reviewed physics journal.
Given how easy it seems to reproduce, someone had better explain this effect if it's not what is claimed there...
PS: this looks like anyone could reproduce or refute it in their basement for a few hundred dollars given all the details in the slides. I'm hoping some amateurs step in.
It all seems to suffer from some of the issues the EM Drive saw: the proposed effect is tiny and very, very difficult to tease apart from environmental and system noise. I hope I'm wrong.
https://www.researchgate.net/publication/383609891_Gravity_M...