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David Treumann
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Is there a cotangent bundle of a stable $\infty$-category?

Let $C$ be a stable $\infty$-category. Is there any categorical construction $C \mapsto T^* C$, where $T^* C$ is another stable $\infty$-category, that specializes to the following?

  1. When $C$ is the derived category of coherent sheaves on a variety $X$, $T^* C$ is the derived category of coherent sheaves on $T^*X$

  2. When $C$ is the derived category of representations of a quiver, $T^* C$ is the derived category of representations of the preprojective algebra attached to the quiver.

I guess a good negative answer would be an example of varieties $X$ and $Y$ with $D(X) = D(Y)$ but $D(T^* X) \neq D(T^* Y)$. Is there a pair of varieties like that?

David Treumann
  • 4.9k
  • 26
  • 36