The Einstein field equations are a system of second order, non-linear, coupled differential equations in 4 variables. As you can imagine, solving such a system is not easy. If the system possesses a ...

During the latter part of the 20th century, string theory was put forward as a unifying theory of physics foundations. String ...

Researchers say they may have achieved Einstein's vision of a "unified field theory" that can unite two of nature's ...

“We proved that the Einstein field equation from general relativity is actually a relativistic quantum mechanical equation,” ...