Dr Nakarin Lohitsiri's Outputs (6)

WZW terms without anomalies: Generalised symmetries in chiral Lagrangians (2024)
Journal Article
Davighi, J., & Lohitsiri, N. (2024). WZW terms without anomalies: Generalised symmetries in chiral Lagrangians. SciPost Physics, 17(6), Article 168. https://doi.org/10.21468/scipostphys.17.6.168

We consider a 4d non-linear sigma model on the coset (SU(N)L × SU(N)R × SU(2))/(SU(N)L+R × U(1)) ∼= SU(N) × S
2, that features a topological Wess–Zumino–Witten (WZW) term whose curvature is n/24π2 Tr(g−1dg )3 ∧ VolS2 where g is the SU(N)
pion field... Read More about WZW terms without anomalies: Generalised symmetries in chiral Lagrangians.

A non-perturbative mixed anomaly and fractional hydrodynamic transport (2024)
Journal Article
Davighi, J., Lohitsiri, N., & Poovuttikul, N. (2024). A non-perturbative mixed anomaly and fractional hydrodynamic transport. Journal of High Energy Physics, 2024(3), 42-55. https://doi.org/10.1007/jhep03%282024%29119

We present a new non-perturbative ’t Hooft anomaly afflicting a quantum field theory with symmetry group G = U(1) × ℤ2 in four dimensions. We use the Adams spectral sequence to compute that the bordism group (BG), which classifies anomalies that rema... Read More about A non-perturbative mixed anomaly and fractional hydrodynamic transport.

Remarks on QCD 4 with fundamental and adjoint matter (2023)
Journal Article
Anber, M. M., Lohitsiri, N., & Sulejmanpasic, T. (2023). Remarks on QCD 4 with fundamental and adjoint matter. Journal of High Energy Physics, 2023(12), Article 63. https://doi.org/10.1007/jhep12%282023%29063

We study 4-dimensional SU(N) gauge theory with one adjoint Weyl fermion and fundamental matter — either bosonic or fermionic. Symmetries, their ’t Hooft anomalies, and the Vafa-Witten-Weingarten theorems strongly constrain the possible bulk phases. T... Read More about Remarks on QCD 4 with fundamental and adjoint matter.

Toric 2-group anomalies via cobordism (2023)
Journal Article
Davighi, J., Lohitsiri, N., & Debray, A. (2023). Toric 2-group anomalies via cobordism. Journal of High Energy Physics, 2023(7), Article 19. https://doi.org/10.1007/jhep07%282023%29019

2-group symmetries arise in physics when a 0-form symmetry G[0] and a 1-form symmetry H[1] intertwine, forming a generalised group-like structure. Specialising to the case where both G[0] and H[1] are compact, connected, abelian groups (i.e. tori), w... Read More about Toric 2-group anomalies via cobordism.

Comments on QCD3 and anomalies with fundamental and adjoint matter (2022)
Journal Article
Lohitsiri, N., & Sulejmanpasic, T. (2022). Comments on QCD3 and anomalies with fundamental and adjoint matter. Journal of High Energy Physics, 2022(10), Article 81. https://doi.org/10.1007/jhep10%282022%29081

’t Hooft anomaly matching is powerful for constraining the low energy phases of gauge theories. In 3d one common anomaly is the parity anomaly in a T-symmetric theory where one cannot gauge the global symmetry group without breaking the time-reversal... Read More about Comments on QCD3 and anomalies with fundamental and adjoint matter.

Anomalies of non-Abelian finite groups via cobordism (2022)
Journal Article
Davighi, J., Gripaios, B., & Lohitsiri, N. (2022). Anomalies of non-Abelian finite groups via cobordism. Journal of High Energy Physics, 2022(9), Article 147. https://doi.org/10.1007/jhep09%282022%29147

We use cobordism theory to analyse anomalies of finite non-abelian symmetries in 4 spacetime dimensions. By applying the method of ‘anomaly interplay’, which uses functoriality of cobordism and naturality of the η-invariant to relate anomalies in a g... Read More about Anomalies of non-Abelian finite groups via cobordism.