5 papers
Covariant variation and its applications
Wen-Bin Liu, Jiang Long
We define a covariant variation of tensor fields by combining its Lie derivative with the metric variation. This operator preserves the metric, contractions, and Hodge duality, but…
Extrapolating the massive fields to future timelike infinity
Wen-Bin Liu, Jiang Long
It is well-known that future timelike infinity () in four-dimensional Minkowski spacetime is conformal to the unit three-dimensional hyperboloid (). We asymptotically exp…
Quantum flux operators in the fermionic theory and their supersymmetric extension
Si-Mao Guo, Wen-Bin Liu, Jiang Long
We construct quantum flux operators with respect to the Poincaré symmetry in the massless Dirac theory at future null infinity. An anomalous helicity flux operator emerges from the…
On the definition of Carrollian amplitudes in general dimensions
Wen-Bin Liu, Jiang Long, Hong-Yang Xiao +1
Carrollian amplitude is the natural object that defines the correlator of the boundary Carrollian field theory. In this work, we will elaborate on its proper definition in general…
Electromagnetic helicity flux operators in higher dimensions
Wen-Bin Liu, Jiang Long, Xin-Hao Zhou
The helicity flux operator is a fascinating quantity that characterizes the angular distribution of the helicity of radiative photons or gravitons and it has many interesting physi…