IN the discussion on relativity at the Royal Society on February 5 (NATURE, February 12), Mr. Jeans stated that the FitzGerald-Lorentz contraction theory presented grave difficulties in the case ...

In our understanding of working spacetime, there’a a series of calculations, the Lorentz transformations, that need to be possible in order for a particular idea to be plausible. Think of it ...

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

Special relativity and Lorentz transformations; Scalar and electromagnetic fields; Curved spacetime and the metric tensor; The equivalence principle; Geodesics, covariant derivatives, and Killing ...

"While the speed and scale of AI's impact may feel sudden, Relativity has been gearing up and investing for this landmark moment for years to be in the position we are now to set our customers and ...