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There's also viscosity and friction due to the strong force. It's under vigorous study in the heavy-ion-collision community to learn about the strong interaction and the phase diagram of strongly interacing (QCD) matter.
B Could gravity be used to send light speed signals?
- Thread starter farolero
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The discussion revolves around the theoretical use of gravity signals for communication across vast distances, specifically from a spaceship five light years away. A proposed method involves creating a thermonuclear explosion to generate particles moving close to light speed, which would theoretically create a detectable gravitational field. However, experts point out that such an explosion would not produce significant gravitational waves due to its spherical symmetry and that gravitational radiation is too weak for reliable communication. Additionally, the concept of increasing gravitational mass with speed is clarified as a misconception; gravity is determined by the stress-energy tensor, not relativistic mass. Ultimately, while gravitational waves exist, they are impractical for communication, and alternative methods like neutrinos are suggested as more viable options.