3 papers
quant-ph2026
Fractional topology and multi-period re-quantization in open quantum systems
Xi Wu, Xiang Zhang, Fuxiang Li
We study fractional topological numbers in open quantum systems described by the Gorin--Kossakowski--Sudarsha--Lindblad master equation. Under symmetry conditions ensuring quantiza…
hep-th2026
Gravitational instantons from closed superstring field theory
Ivo Sachs, Xianghang Zhang
We test exact marginality of the deformation describing the resolution of a orbifold by analyzing the closed superstring equations of motion to third order in the si…
hep-th2025
Action of Open Superstring Field Theory
Xianghang Zhang
We formulate a string field theory for open strings with an algebra structure. Starting from the BRST cohomology relative to the U(1) anti-ghost zero-m…