[tzs]

>> The speed, wavelength, and frequency of a gravitational wave are related by the equation c = λf, just like the equation for a light wave [...]

> To get a short wavelength requires a high frequency

For light that is assuming a vacuum. The more general equation is c' = λf where c' is the speed of light in the medium the light is traveling through. c' <= c. Hence, for light, you can get a shorter wavelength without having to raise the frequency if you work with the light in a medium with a lower c'.

Is there anything similar with gravitational waves?

[dotnet00]

Probably not because the medium is the same spacetime everywhere and there isn't anything we know of that slows down or blocks gravity.

[9dev]

Now wouldn’t that make for a neat science fiction plot setup.