Well kinda, actually! Relativistic equations have been adopted in quantum theory, which gives rise to quantum field theory as a means of reconciling quantum mechanics and relativity. The two are compatible to a degree; bosons dictating the behaviour of electromagnetism (photons), strong forces (gluons) and weak forces (W and Z bosons) are all well behaved in quantum field theory. However, gravitons simply don't fit into it. The equations diverge into infinities. The graviton is kinda like the missing link between the two theories. String theory is a supposed solution to the graviton problem, but I only know vaguely of the statements it makes.
Usually, if an equation returns an infinite answer, it means it's faulty! Even with black holes, there is speculation as to if a density can be treated as infinite, or if the equations just go bust after a certain point (probably the latter)
Usually, if an equation returns an infinite answer, it means it's faulty! Even with black holes, there is speculation as to if a density can be treated as infinite, or if the equations just go bust after a certain point (probably the latter)