the physics of geometry
When on September 14th 2015 the gravitational wave signal emitted 1.5 billion year ago by two coalescing black stars was detected at LIGO I and LIGO II, we not only obtained a new spectacular confirmation of General Relativity but we actually saw the dynamical process of formation of the most intriguing objects populating the Universe, namely black holes.
Fré, P. (2018). Black holes: the physics of geometry, in A conceptual history of space and symmetry, Dordrecht, Springer, pp. 269-287.
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