D. Krashen

activity

20022025

most citedApplications of patching to quadratic forms and central simple algebras

107 citations · 173 across the 36 of their papers we have counts for

collaborators

40 papers

math.AG2025

A Looming of phantoms

Kimoi Kemboi, Daniel Krashen, Tianle Liu +6

Following Krah's method, we construct new examples of phantom categories as semiorthogonal components of the derived categories of two types of rational surfaces: the blowup of the…

math.NT2025

On rational connectedness and parametrization of finite Galois extensions

Daniel Krashen, Danny Neftin

Given two $G$ -Galois extensions of $Q$ , is there an extension of $Q (t)$ that specializes to both? The equivalence relation on $G$ -Galois extension of $Q$ , i…

math.AG2025

Finiteness of formal pushforwards

David Harbater, Julia Hartmann, Daniel Krashen

Under mild hypotheses, given a scheme $U$ and an open subset $V$ whose complement has codimension at least two, the pushforward of a torsion-free coherent sheaf on $V$ is coherent…

math.RA2024

Classes in $H_{p^{m}}^{n + 1} (F)$ of lower exponent

Adam Chapman, Daniel Krashen, Kelly McKinnie

Let $F$ be a field of characteristic $p > 0$ . We prove that if a symbol $A = ω \otimes β_{1} \otimes \dots \otimes β_{n}$ in $H_{p^{m}}^{n + 1} (F)$ is of exponent dividing $p^{m - 1}$ , then its s…

math.RT2024

Morita equivalences for Zhu's algebra

Chiara Damiolini, Angela Gibney, Daniel Krashen

Through the introduction of new ideals, and with the assistance of the $d$ -th mode transition algebras $A_{d}$ , for $d \in N$ , we show how Zhu's associative algebr…

math.QA2023

Conformal blocks on smoothings via mode transition algebras