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This is sort of an offshoot of some other recent threads.
We know that E&M radiation interacts with dipoles (Example: (+...-), plus being a positive charge and - a negative charge) and that dipoles can "slow down" E&M radiation - i.e. light travels slower than 'c' in a dieletric medium.
Do we have any idea whether quadropoles (+...+) being an example of a quadropole, have any similar (and probably very very small) effect on gravitational radiation?
We know that E&M radiation interacts with dipoles (Example: (+...-), plus being a positive charge and - a negative charge) and that dipoles can "slow down" E&M radiation - i.e. light travels slower than 'c' in a dieletric medium.
Do we have any idea whether quadropoles (+...+) being an example of a quadropole, have any similar (and probably very very small) effect on gravitational radiation?