"General relativity (GR) is a geometric theory of gravitation: a gravitational field is simply curved spacetime. The g…"

"In GR, the mass/energy source determines the metric function through the field equation. ...In this approach, gravity…"

"We may conceive our space to have everywhere a nearly uniform curvature, but that slight variations of the curvature …"

"Every artist's strictly illimitable country is himself. An artist who plays that country false has committed suicide;…"

"Mathematicians call the infinite curvature limit of spacetime a singularity. In this picture, then, the big bang emer…"

"The discovery of Minkowski... is to be found... in the fact of his recognition that the four-dimensional space-time c…"

"Every physical description resolves itself into a number of statements, each of which refers to the space-time coinci…"

"The use of rigid reference-bodies, in the sense of the method followed in the special theory of relativity, is in gen…"

"The idea of having an ambient space-time of some specific dimension seems to play less of a role in string theory tha…"

"Unfortunately, scientists adore the Minkowski theory because, secretly they detest the 3+1 formula as not entirely ob…"