"“exotic” matter (which falls up, rather than down)"
https://mkaku.org/home/articles/the-physics-of-time-travel/
Calculations provide insight into why sound waves carry ‘negative mass’
https://physicsworld.com/a/calculations-provide-insight-into-why-sound-waves-carry-negative-mass/
"The plasma, mercury based, is pressurized at 250,000 atmospheres at a temperature of 150 degrees Kelvin and accelerated to 50,000 rpm to create a super-conductive plasma with the resulting gravity disruption."
https://theeventchronicle.com/secret-plane-tr-3b-patent/
"a transformer generates high temperature in the matter in between the spheres and a force is applied on the inner face of the outer sphere by the inner hallow sphere and the system looses its weight depending on the temperature"
https://patents.google.com/patent/WO2001009509A2/en