Year: 2026
Type: preprint
Abstract: We extend Toën's derived Brauer theory to the open site of Spivak's derived smooth manifolds. For a compact derived smooth manifold $X$, we define a spectralized structure sheaf $\mathbb{O}_{X}$ and prove that every Picard twist can be represented by a derived Azumaya algebra, whose Morita equivalence class is uniquely determined by the twist. In the open locally Morita trivial setting, this gives a natural bijection \begin{align*} Φ_{X}:\mathbf{dBr}^{\mathrm{open}}(X) \xrightarrow{\cong} H^{1}(|X|;\underline{\mathbb {Z}}) \times π_0Γ(|X|,\mathrm B^2GL_1(\mathbb O_X)). \end{align*} If we consider $C^\infty_X(\mathbb C)$ on ordinary smooth manifolds, the second factor is $H^3(|X|;\underline{\mathbb Z})$, which recovers the Dixmier-Douady invariant. If we consider $C^\infty_X(\mathbb R)$, the second factor is $H^2(|X|;\underline{\mathbb Z/2})$, which recovers the corresponding invariant of Donovan and Karoubi.
Source: arXiv (Cornell University)
Authors: Mao, Yimu, Tropp, Christopher
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7171557352