- Commit
- 7f271948864bef9c9cec263b766566fe68c37ee2
- Parent
- 7d921b6ee8881a3a4376f6c8daf6e53b007fbc2d
- Author
- Pablo <pablo-pie@riseup.net>
- Date
Added some final remarks to the dissertation
My M2 Memoire on mapping class groups & their representations
Added some final remarks to the dissertation
1 file changed, 19 insertions, 3 deletions
Status | File Name | N° Changes | Insertions | Deletions |
Modified | sections/representations.tex | 22 | 19 | 3 |
diff --git a/sections/representations.tex b/sections/representations.tex @@ -563,8 +563,24 @@ respect to which the matrices of \(\rho(\tau_{\gamma_1}), \ldots, \(H_1(\Sigma_g, \mathbb{C})\), concluding the classification of \(2g\)-dimensional representations. -% TODO: Add some final comments about how the rest of the landscape of -% representations is generally unknown and how there is a lot to study in here Recently, Kasahara \cite{kasahara} also classified the \((2g+1)\)-dimensional representations of \(\Mod(\Sigma_g^b)\) for \(g \ge 7\) in terms of certain -twisted \(1\)-cohomology groups. +twisted \(1\)-cohomology groups. On the other hand, the representations of +dimension \(n > 2g + 1\) are still poorly understood, and fundamental questions +remain unsweared. In the short and mid-terms, the works of Korkmaz and Kasahara +lead to many follow-up questions. For example, +\begin{enumerate} + \item In the \(g \ge 3\) case, Korkmaz \cite[Theorem~3]{korkmaz} established + the lower bound of \(3g - 3\) for the dimension of an injective linear + representation of \(\Mod(\Sigma_g)\) -- if one such representation exists. + Can we improve this lower bound? + + \item What is the minimal dimension for a representation of + \(\Mod(\Sigma_g)\) which does not annihilate the entire kernel of the + symplectic representation \(\psi : \Mod(\Sigma_g) \to + \operatorname{Sp}_{2g}(\mathbb{Z})\)? In particular, do the \((2g + + 1)\)-dimensional representations classified by Kasahara \cite{kasahara} + annihilate all of \(\ker \psi\)? +\end{enumerate} + +These are some of the questions which I plan to work on during my upcoming PhD.