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2 votes
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171 views

Is this double quotient of $\operatorname{SL}_2$ representable by an algebraic space or a sc...

$\DeclareMathOperator\SL{SL}$Let $B$ be a Borel subgroup (upper triangular matrices), and let $\Gamma := \langle \sigma\rangle$ be the group generated by a (hyperbolic) element of $\SL_2/\mathbb{Q}_p$ …
kindasorta's user avatar
  • 2,907
3 votes
1 answer
282 views

Is this functor $\mathcal{F}: \text{Sch}/\mathbb{Q}\longrightarrow \text{Sets}$ a sheaf?

Consider the functor $\mathcal{F}: \text{Sch}/\mathbb{Q}\longrightarrow \text{Sets}$, defined by sending a scheme $X$ with coordinate ring $\mathcal{O}(X)$ to the set of orbits $B(\mathcal{O}(X))\setm …
kindasorta's user avatar
  • 2,907
1 vote
0 answers
135 views

The stack $\operatorname{GL}_2/B$

Let $F$ be the functor from the category of affinoid Tate algebras over $\mathbb{Q}_p$ to the category $\mathrm{Sets}$, which maps an affinoid $\operatorname{Spm} R$ to the set of orbits $\operatornam …
kindasorta's user avatar
  • 2,907
2 votes
0 answers
173 views

Representability of the sheaf $\mathrm{Hom}(G,\mathrm{SL}_2)$

$\DeclareMathOperator\Spm{Spm}\DeclareMathOperator\SL{SL}\DeclareMathOperator\Hom{Hom}$Let $T$ be the topos of $\Spm\mathbb{Q}_p$-rigid analytic spaces, $G$ an abstract group, and $\Hom(G,\SL_2)$ the …
kindasorta's user avatar
  • 2,907
3 votes
0 answers
183 views

Representability of $\operatorname{Hom}(G_{\mathbb{Q}}, \operatorname{GL}_2)$

Let $G_{\mathbb{Q}}$ be the absolute Galois group of the rationals, and let $F: \mathrm{Aff}/\textbf{Q}_p\longrightarrow \mathrm{Sets}$ be the functor which associates to every affine $\mathbb{Q}_p$ s …
kindasorta's user avatar
  • 2,907