Conveners
EFTs in phenomenology
- Chao-Qiang Geng (HIAS)
EFTs in phenomenology
- There are no conveners in this block
We revisited the sphaleron configuration in a 1+1-dimensional (1+1D) field theory model, achieved by introducing linear additional terms into the action of the $O(3)$ nonlinear $\sigma$-model. We discretize the Lagrangian of the aforementioned 1+1D model and construct a Hamiltonian representation based on unitary quantum gate forms, enabling the construction of quantum-simulated sphaleron....
Parameters in an effective field theory can be subject to certain positivity bounds if one requires a UV completion that obeys the fundamental principles of quantum field theory. These bounds are relatively straightforward at the tree level, but would become more obscure when loop effects are important. Using scalar theories as examples, we carefully exam the positivity bounds in a case...
We analyze causality and unitarity constraints
in graviton scattering amplitudes, aiming to establish new bounds on theories with $U(1)$-gravitational anomalies, such as axion models
or strongly-coupled gauge theories. For this purpose, we show the necessity of coupling these theories to gravity. We obtain a universal scale $\Lambda_{\rm caus}$ at which states with $J\geq 4$ must...
