4 papers
On anomalies and fermionic unitary operators
Masaki Okada, Shutaro Shimamura, Yuji Tachikawa +1
We point out that fermionic unitary operators which anticommute among themselves appear in various situations in quantum field theories with anomalies in the Hamiltonian formalism.…
On a -valued discrete topological term in 10d heterotic string theories
Yuji Tachikawa, Hao Y. Zhang
We show that the low-energy effective actions of two ten-dimensional supersymmetric heterotic strings are different by a -valued discrete topological term even after…
Type I anomaly cancellation revisited
Saghar S. Hosseini, Yuji Tachikawa, Hao Y. Zhang
We revisit the issue of how the perturbative and global fermion anomaly of Type I string theory in ten dimensions is cancelled by the Green-Schwarz mechanism using the RR fields. T…
Non-invertible symmetries act locally by quantum operations
Masaki Okada, Yuji Tachikawa
Non-invertible symmetries of quantum field theories and many-body systems generalize the concept of symmetries by allowing non-invertible operations in addition to more ordinary in…