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Nathan Rosen – Wormholes and Time Travel

Nathan Rosen – Wormholes and Time Travel

Tabea Tietz
On March 22, 1909, US-American physicist Nathan Rosen was born. He is best known for his cooperation together with Albert Einstein and Boris Podolsky on the quantum-mechanical description of physical reality leading the the so-called Einstein-Podolsky-Rosen paradoxon, as well as his postulation of worm holes connecting distant areas in space. Although purely theoretic, his work also had an important impact on science fiction literature. Early Years Nathan Rosen was born in New York City. He first…
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physics
Karl Schwarzschild and the Event Horizon

Karl Schwarzschild and the Event Horizon

Tabea Tietz
On October 9, 1873, German physicist and astronomer Karl Schwarzschild was born. He provided the first exact solution to the Einstein field equations of general relativity, for the limited case of a single spherical non-rotating mass, which he accomplished in 1915, the same year that Albert Einstein first introduced general relativity. The Schwarzschild solution leads to a derivation of the Schwarzschild radius, which is the size of the event horizon of a…
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astronomy
Subrahmanyan Chandrasekhar and the Evolution of Stars

Subrahmanyan Chandrasekhar and the Evolution of Stars

Harald Sack
On October 19, 1910, Indian-American astrophysicist and Nobel Laureate Subrahmanyan Chandrasekhar was born. He won the 1983 Nobel Prize for Physics together with William Alfred Fowler for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars. Actually, winning Nobel Prizes in physics must lie somehow in the family of Chandrasekhar, because his uncle Sir Chandrasekhara Venkata Raman won the Nobel Prize for Physics already in 1930,…
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physics
John Wheeler and the Golden Age of General Relativity

John Wheeler and the Golden Age of General Relativity

Tabea Tietz
On July 9, 1911, American theoretical physicist John Archibald Wheeler was born. Wheeler worked with Niels Bohr in explaining the basic principles behind nuclear fission as well as with Albert Einstein, with whom he tried to achieve Einstein’s vision of a unified field theory. He is also known for popularizing the term black hole, and for coining the terms quantum foam, and wormhole. Background John Wheeler John Archibald Wheeler grew up in a Unitarian…
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mathematics
George David Birkhoff and the Ergodic Theorem

George David Birkhoff and the Ergodic Theorem

Harald Sack
On March 21, 1884, American mathematician George David Birkhoff was born. Birkhoff is best known for what is now called the ergodic theorem. Birkhoff was one of the most important leaders in American mathematics in his generation, and during his time he was considered by many to be the preeminent American mathematician. “The transcendent importance of love and good-will in all human relationships is shown by their mighty beneficent effect upon the…
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