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gr-qc2010★ 2 cited
A spacetime with closed timelike geodesics everywhere
Oyvind Gron, Steinar Johannesen
In the present article we find a new class of solutions of Einstein's field equations. It describes stationary, cylindrically symmetric spacetimes with closed timelike geodesics ev…
physics.gen-ph2010
The twin paradox and the principle of relativity
Oyvind Gron
In the standard formulation of the twin paradox an accelerated twin considers himself as at rest and his brother as moving. Hence, when formulating the twin paradox, one uses the g…