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visits | member for | 2 years, 11 months |
seen | Aug 26 '12 at 1:04 | |
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Jan 16 |
comment |
From Sato grassmannian to spectral curve
The Kontsevich-Witten tau funtion is in fact a solution of the Kortewg-de Vries hierarchy, not just of KP. This means that the corresponding point of the Grassmannian comes from an element Of the loopgroup of Sl_2, not from an element of the general linear group. Such points always have z^2 as stabilizer, so for trivial reasons we get a P^1 as spectral curve. The "honest" spectral curves for KdV are 2-fold covers of this base curve. See, as always, Segal-Wilson. |
Jan 15 |
comment |
From Sato grassmannian to spectral curve
Well, look for all g such that $g\phi_k$ is a linear combination of the basis elements. You get a bunch of equations for the coefficients of g. Yes, it is an interesting exercise to see if the Kontsevich-Witten point has a spctral curve. I do not know the answer, but you would expect that the curve would be trivial, no? It would be very strange if the genus of this curve would be any finite number. I am not sure if you can get infinite genus curves in this way. |
Jan 14 |
awarded | Teacher |
Jan 14 |
comment |
From Sato grassmannian to spectral curve
I am not sure what your notation means. Is \phi_k a basis for the point of the Grassmannian? In any case, for a generic point of the Grassmanian the spectral curve will be trivial. |
Jan 14 |
answered | From Sato grassmannian to spectral curve |