Einstein-Rosen bridge

Figure 6.2 Einstein-Rosen bridge through a black hole...

In an ehort to derive particle properties from general relativity Einstein and Rosen (1935) investigated spherically symmetrical solutions of the held equations, including the Schwarzschild solution. On the premise that every held theory should exclude singularities of the held, they found this to be possible provided the physical space is represented by two identical sheets connected by bridges at the position of a singular point of the unmodihed metric. The hnal solution was found only to pertain to massless particles, and quantum phenomena could not be demonstrated a priori. However, in... 

The important conclusion is that a region without singularity opens up between the two hyperbolic curves, r = 0. It acts as a non-Euclidean bridge, of the type proposed by Einstein and Rosen, between two otherwise Euclidean spaces, as shown in Figure 6.2. The null geodesics (r = 2m) meet at the origin, which means an inversion of time flow, +t —> —t. 

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