The Ito equation is shown to be a geodesic flow of $L^2$ metric on the semidirect product space ${\widehat{{\it Diff}^s(S^1) \bigodot C^{\infty }(S^1)}}$, where ${\it Diff}^s(S^1)$ is the group of orientation preserving Sobolev $H^s$ diffeomorphisms of the circle. We also study a geodesic flow of a $H^1$ metric.
@article{107745, author = {Partha Guha}, title = {Ito equation as a geodesic flow on $\widehat {\text{Diff}\sp {s}(S\sp 1) \bigodot C\sp {\infty }(S\sp 1)}$}, journal = {Archivum Mathematicum}, volume = {036}, year = {2000}, pages = {305-312}, zbl = {1049.37045}, mrnumber = {1811175}, language = {en}, url = {http://dml.mathdoc.fr/item/107745} }
Guha, Partha. Ito equation as a geodesic flow on $\widehat {\text{Diff}\sp {s}(S\sp 1) \bigodot C\sp {\infty }(S\sp 1)}$. Archivum Mathematicum, Tome 036 (2000) pp. 305-312. http://gdmltest.u-ga.fr/item/107745/
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