I Einstein's 1935 Paper on Wormholes & Modern Physics

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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?
 

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