Re: If we could only observe antigravitational effects
The trouble is, anything with antigravitational properties "fell up" into the deep space between galaxies billions of years ago. Okay, kidding a bit here.
But seriously, and speaking as a non-nuclear-physicist, if something with "anti gravity" or "negative gravity" were generated in an accelerator as a sub-atomic particle, wouldn't it be too small, fast, and temporary to tell if it was reacting oddly to gravity or not?