there have been no scientific theories that conclusively disprove or contradict Einstein's theories of general relativity and special relativity. Both of these theories have been extensively tested and have consistently demonstrated remarkable agreement with a wide range of experimental observations and measurements.
General relativity, which describes the gravitational interactions between matter and the geometry of spacetime, has successfully predicted and explained phenomena such as the bending of light around massive objects, the precession of Mercury's orbit, and the existence of black holes. It has also passed rigorous tests in the realms of cosmology and astrophysics.
Special relativity, which deals with the behavior of objects moving at high speeds and the constancy of the speed of light, has been verified by numerous experiments and is the foundation for many modern technologies, including particle accelerators and GPS systems.
That being said, science is an ongoing and dynamic process, and new evidence or experimental observations could potentially lead to the refinement or modification of existing theories. Scientists continue to explore the frontiers of physics and conduct experiments to probe the limits of our current understanding, including areas where general relativity and special relativity might need to be revised or extended, such as in the unification of gravity with quantum mechanics (quantum gravity).
However, it's important to note that any proposed modifications or alternative theories would need to account for the vast amount of experimental evidence supporting general relativity and special relativity and explain the observed phenomena just as successfully, if not better.