4 citations · 7 across the 2 of their papers we have counts for
5 papers
Topological terms of (2+1)d flag-manifold sigma models
Ryohei Kobayashi, Yasunori Lee, Ken Shiozaki +1
We examine topological terms of d sigma models and their consequences in the light of classifications of invertible quantum field theories utilizing bordism groups. In parti…
Anomaly constraint on chiral central charge of (2+1)d topological order
Ryohei Kobayashi
In this short paper, we argue that the chiral central charge of a (2+1)d topological ordered state is sometimes strongly constrained by 't Hooft anomaly of anti-unitary globa…
Commuting projector models for (3+1)d topological superconductors via string net of (1+1)d topological superconductors
Ryohei Kobayashi
We discuss a way to construct a commuting projector Hamiltonian model for a (3+1)d topological superconductor in class DIII. The wave function is given by a sort of string net of t…
Anomaly indicator of rotation symmetry in (3+1)D topological order
Ryohei Kobayashi, Ken Shiozaki
We examine (3+1)D topological ordered phases with rotation symmetry. We show that some rotation symmetric (3+1)D topological orders are anomalous, in the sense that they cann…
Scaling of polarization amplitude in quantum many-body systems in one dimension
Ryohei Kobayashi, Yuya O. Nakagawa, Yoshiki Fukusumi +1
Resta proposed a definition of the electric polarization in one-dimensional systems in terms of the ground-state expectation value of the large gauge transformation operator. Vanis…