Cavity optomechanics is a branch of physics which focuses on the interaction between light and mechanical objects on low-energy scales. It is a cross field of optics, quantum optics, solid-state physics and materials science. The motivation for research on cavity optomechanics comes from fundamental effects of quantum theory and gravity, as well as technological applications.
Solid-state physics is unrelated to the study of gravity.
The text does not explicitly state any relationship between the two; perhaps the model knows this subject and uses knowledge outside the text.
( z1 relate :polarity - :ARG1 ( z2 physics :mod ( z3 solid-state ) ) :ARG2 ( z4 study :ARG1 ( z5 gravity ) ) )