I Einstein's 1935 Paper on Wormholes & Modern Physics

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Einstein's 1935 paper briefly introduced the concept of wormholes, specifically addressing singularities through the idea of bridges in spacetime. Despite its potential implications, Einstein did not further develop this concept in subsequent works. The recent proposal of ER=EPR by Susskind and Maldacena suggests a connection between entanglement and wormholes, indicating a modern interpretation of Einstein's original ideas. However, the original spacetime model discussed still contains singularities, raising questions about its compatibility with current theories like string theory. The discussion highlights the ongoing relevance of Einstein's work in contemporary physics debates.
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Einstein Rosen Bridges
Does anybody know why Einstein never pursued the idea of wormholes beyond his very short 1935 paper? If he did does anybody know of any of his papers that go into this idea in more detail. I know recently there was the proposal of EPR=ER mainly put forth by Susskind and Maldecena. The ER=EPR seems like an implied result of Einstein's original work, to begin with. The paper was titled "the particle problem in the General Theory of Relativity" and addressed the avoidance of singularities by bridges. How does this paper pan out with modern physics like string theory and so forth?
 
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dsaun777 said:
the avoidance of singularities by bridges

I'm not sure what this means, since the spacetime that contains the Einstein-Rosen bridge, maximally extended Schwarzschild spacetime, has singularities (two of them).

Do you have a link to the paper you refer to?
 

Thread 'Physical Interpretation of Frame Field'

Moderator's note: Spin-off from another thread due to topic change. In the second link referenced, there is a claim about a physical interpretation of frame field. Consider a family of observers whose worldlines fill a region of spacetime. Each of them carries a clock and a set of mutually orthogonal rulers. Each observer points in the (timelike) direction defined by its worldline's tangent at any given event along it. What about the rulers each of them carries ? My interpretation: each...
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