Reply to thread

Message

<blockquote data-quote="tomBitonti" data-source="post: 6637970" data-attributes="member: 13107">Sorry, writing too quickly.&nbsp; I have a better understanding of the topology than the physics, so I'll approach from that direction.Putting this in two dimensions: You could imagine a clean splice/join, with two sheets joined across a cut.&nbsp; If you made the cut a line, then you would have a discontinuity at the ends of the slice, but a completely flat transition across the cut.You can make the join a ring, which avoids the end effects, but you end up with a different problem.&nbsp; The join shifts you from a concave segment to a convex segment.&nbsp; (Imagine pushing a curved bar through the cut: It ends up curved the other way.)&nbsp; Crossing the throat would be the same as a bend, and probably a big problem for a small ring.&nbsp; The problem is the shift from heading in to the ring to heading away from the ring.&nbsp; There is no adjustment to the join which avoids this problem (without changing the local metric).If you use a ring and set the metric to make the join locally flat (not sure if that makes sense), then you have the problem of the transition from asymptotically flat space to the join, with curvature required by the transition.&nbsp; Which means there are apparent forces and tidal stress, so still a problem.The question, then, is how much does this line of thinking make sense: For a physical wormhole, what case occurs?&nbsp; I'm thinking the third.&nbsp; But then, Stargate or Sliders would have forces (potentially huge ones) near the throat.&nbsp; Is there any way to avoid these?Thx!TomB</blockquote>

[QUOTE="tomBitonti, post: 6637970, member: 13107"] Sorry, writing too quickly. I have a better understanding of the topology than the physics, so I'll approach from that direction. Putting this in two dimensions: You could imagine a clean splice/join, with two sheets joined across a cut. If you made the cut a line, then you would have a discontinuity at the ends of the slice, but a completely flat transition across the cut. You can make the join a ring, which avoids the end effects, but you end up with a different problem. The join shifts you from a concave segment to a convex segment. (Imagine pushing a curved bar through the cut: It ends up curved the other way.) Crossing the throat would be the same as a bend, and probably a big problem for a small ring. The problem is the shift from heading in to the ring to heading away from the ring. There is no adjustment to the join which avoids this problem (without changing the local metric). If you use a ring and set the metric to make the join locally flat (not sure if that makes sense), then you have the problem of the transition from asymptotically flat space to the join, with curvature required by the transition. Which means there are apparent forces and tidal stress, so still a problem. The question, then, is how much does this line of thinking make sense: For a physical wormhole, what case occurs? I'm thinking the third. But then, Stargate or Sliders would have forces (potentially huge ones) near the throat. Is there any way to avoid these? Thx! TomB [/QUOTE]

Verification