ISBN-13: 9783642068195 / Angielski / Miękka / 2010 / 281 str.
ISBN-13: 9783642068195 / Angielski / Miękka / 2010 / 281 str.
The general theory of relativity, as formulated by Albert Einstein in 1915, provided an astoundingly original perspective on the physical nature of gr- itation, showing that it could be understood as a feature of a curvature in the four-dimensional continuum of space-time. Now, some 90 years later, this extraordinary theory stands in superb agreement with observation, prov- ing a profound accord between the theory and the actual physical behavior of astronomical bodies, which sometimes attains a phenomenal precision (in one case to about one part in one hundred million million, where several d- ferent non-Newtonian e?ects, including the emission of gravitational waves, are convincingly con?rmed). Einstein s tentative introduction, in 1917, of an additional term in his equations, speci?ed by a cosmological constant, - pearsnowtobeobservationallydemanded, andwiththistermincluded, there is no discrepancy known between Einstein s theory and classical dynamical behavior, from meteors to matter distributions at the largest cosmological scales. One of Einstein s famous theoretical predictions that light is bent in a gravitational ?eld (which had been only roughly con?rmed by Eddington s solareclipsemeasurementsattheIslandofPrincipein1919, butwhichisnow very well established) has become an important tool in observational cosm- ogy, where gravitational lensing now provides a unique and direct means of measuring the mass of very distant objects."