Gravitational waves are not discovered directly (yet). But does this have any consequences? Should we suspect out theories are wrong or not yet?
I found some data about gravitational waves suspected spectrum, like here, and wonder, where is it taken from?
Where is the location of indirect measurements of neutron star energy loss on this plot?
If LISA won't find any waves, what will it mean?
Eventually gravitational waves will have to be detected, or general relativity is wrong.
It is certainly not certain that we should be able to see gravitational waves yet, with the equipment we have -- devices like LIGO and bar detectors require a certain proximity to events that would create large GW sources, like black hole mergers and supernovae, and so, there really is no knowing whether or not one has happened, and therefore, whether we SHOULD be seeing a gravitational wave. Heuristic calculations indicate that Advanced LIGO should be able to detect something, but it does depend on the count of binary black hole systems that are out there.
