Question

what is the diffrence between gravitational waves and de brogles waves

Answer 1

The scale or magnitude.  De Broglie waves describe waves generated by a particle.  Gravitational waves are generated by massive celestial objects.The process that generates the wave.  My interpretation is that matter waves is the effect on space due to oscillation (changes in amplitude) of the particle.  QM describes the wave as non-physical, a "probabilistic wave