With the discovery of pulsars, quasars, and galactic X-ray sources in the late 60's and early 70's, and the coincident expansion in the search for gravitational

The direct detection of gravitational waves in 2015 has initiated a new era of gravitational wave astronomy, which has already paid remarkable dividends in our

General relativity and quantum mechanics have become the two central pillars of theoretical physics. Moreover, general relativity has important applications in

Spacetime physics -- Physics in flat spacetime -- The mathematics of curved spacetime -- Einstein's geometric theory of gravity -- Relativistic stars -- The uni

Weinberg's 1972 work, in his description, had two purposes. The first was practical to bring together and assess the wealth of data provided over the previous d