Example 2.12 . [048X]
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Example 2.12.
Consider two almost calibrated Lagrangians with a unique intersection point , and there is a Darboux chart around modelled on , such that inside the chart the local setup is
Let be a 1-parameter family of Lagrangian connected sums with neck length , which all agree with except in a compact subset in . Inside , we take the ansatz
where the curve can be chosen so that is almost calibrated and agrees with outside . Clearly, are related by scaling inside . The Hamiltonian vector field along , which is really a section of , agrees with inside and is zero outside.3838 38 This is consistent because near the boundary of , the position vector is a tangent vector of , so vanishes in the quotient . The corresponding Hamiltonian function is times a smooth function of one variable ; a small caveat is that converges to two generally different constants along and . Thus it takes finite distance in the Solomon metric to reach the limit , and the Solomon functional remains finite, but the topology changes from to .