250 citations · 863 across the 16 of their papers we have counts for
17 papers
Topological Aspects of the Model in the Continuum and on the Lattice
Yichul Choi, Nathan Seiberg, Sahand Seifnashri +1
We discuss the continuum two-dimensional conformal field theory, whose target space is a two-torus. In addition to its standard zero-form internal symmetries, the model also has a…
Lattice chiral symmetry from bosons in 3+1d
Zhiyao Lu, Sahand Seifnashri, Shu-Heng Shao
We present a solvable Hamiltonian that realizes an exact lattice chiral symmetry. Nielsen-Ninomiya-type no-go theorems are evaded by using lattice bosons rat…
Exactly Solvable 1+1d Chiral Lattice Gauge Theories
Sahand Seifnashri
Using the modified Villain lattice Hamiltonian formulation of the 1+1d compact boson theory, we construct exactly solvable abelian chiral lattice gauge theories in two spacetime di…
Symmetry Transmutation and Anomaly Matching
Nathan Seiberg, Sahand Seifnashri
We explore a situation where a global symmetry of the ultraviolet (UV) theory does not act faithfully on the local infrared (IR) degrees of freedom, but instead acts effectively as…
Disentangling anomaly-free symmetries of quantum spin chains
Sahand Seifnashri, Wilbur Shirley
We clarify the lore that anomaly-free symmetries are either on-site or can be transformed into on-site symmetries. We prove that any finite, internal, anomaly-free symmetry in a 1+…
Gauging non-invertible symmetries on the lattice
Sahand Seifnashri, Shu-Heng Shao, Xinping Yang
We provide a general prescription for gauging finite non-invertible symmetries in 1+1d lattice Hamiltonian systems. Our primary example is the Rep(D) fusion category generated…
Cluster state as a non-invertible symmetry protected topological phase
Sahand Seifnashri, Shu-Heng Shao
We show that the standard 1+1d cluster model has a non-invertible global symmetry, described by the fusion category Rep(D). Therefore, the clu…
Non-invertible symmetries and LSM-type constraints on a tensor product Hilbert space
Nathan Seiberg, Sahand Seifnashri, Shu-Heng Shao
We discuss the exact non-invertible Kramers-Wannier symmetry of 1+1d lattice models on a tensor product Hilbert space of qubits. This symmetry is associated with a topological defe…
Lieb-Schultz-Mattis anomalies as obstructions to gauging (non-on-site) symmetries
Sahand Seifnashri
We study 't Hooft anomalies of global symmetries in 1+1d lattice Hamiltonian systems. We consider anomalies in internal and lattice translation symmetries. We derive a microscopic…
Asymptotic density of states in 2d CFTs with non-invertible symmetries
Ying-Hsuan Lin, Masaki Okada, Sahand Seifnashri +1
It is known that the asymptotic density of states of a 2d CFT in an irreducible representation of a finite symmetry group is proportional to . We show how this s…
Higher Gauging and Non-invertible Condensation Defects
Konstantinos Roumpedakis, Sahand Seifnashri, Shu-Heng Shao
We discuss invertible and non-invertible topological condensation defects arising from gauging a discrete higher-form symmetry on a higher codimensional manifold in spacetime, whic…
Construction of two-dimensional topological field theories with non-invertible symmetries
Tzu-Chen Huang, Ying-Hsuan Lin, Sahand Seifnashri
We construct the defining data of two-dimensional topological field theories (TFTs) enriched by non-invertible symmetries/topological defect lines. Simple formulae for the three-po…
Higher central charges and topological boundaries in 2+1-dimensional TQFTs
Justin Kaidi, Zohar Komargodski, Kantaro Ohmori +2
A 2+1-dimensional topological quantum field theory (TQFT) may or may not admit topological (gapped) boundary conditions. A famous necessary, but not sufficient, condition for the e…
Feynman, Lewin, and Einstein Download Zoom: A Guide for Incorporating E-Teaching of Physics in a Post-COVID World
Daniel J. O'Brien
Distance education has expanded significantly over the last decade, but the natural sciences have lagged in the implementation of this instructional mode. The abrupt onset of the C…
Line Operators of Gauge Theories on Non-Spin Manifolds
J. P. Ang, Konstantinos Roumpedakis, Sahand Seifnashri
We study four-dimensional gauge theories on oriented and non-spin spacetime manifolds. On such manifolds, each line operator arises only either as a boson or a fermion. Based on ph…
3D Dualities and Supersymmetry Enhancement from Domain Walls
Martin Roček, Konstantinos Roumpedakis, Sahand Seifnashri
We test recently proposed IR dualities and supersymmetry enhancement by studying the supersymmetry on domain walls. In the Wess-Zumino model studied in arXiv:1804.02018 and…
Time independent quantum circuits with local interactions
Sahand Seifnashri, Farzad Keyanvash, Jahangir Nobakht +1
Heisenberg spin chains can act as quantum wires transferring quantum states either perfectly or with high fidelity. Gaussian packets of excitations passing through dual rails can e…