Abstract:
Novel representation of scattering amplitudes reveals a rich relations in particle/string theories. In this talk, I will first introduce a universal expansion for one-loop gluon amplitudes, which holds for general gauge theories with gluons/fermions/scalars in the loops. These amplitudes are expressed as linear combinations of scalar-loop integrands weighted by gauge-invariant building blocks. Then, I will show how tree-level open superstring amplitudes can be constructed from sum of stringy Tr$(\phi^3)$ amplitudes with specific kinematic shifts. Upon taking $n$ scaffolding residues, this leads to a new formula of the $n$-gluon superstring amplitude, which is manifestly symmetric in $n-1$ legs, as a gauge-invariant combination of mixed bosonic string amplitudes with gluons and scalars.
About the speaker:
Jin Dong is a PhD student at the Institute of Theoretical Physics, Chinese Academy of Sciences. His research focuses on the mathematical structure of scattering amplitudes in quantum field theory and string theory. He is particularly interested in uncovering novel connections between different theoretical frameworks and in developing new representations of amplitudes that reveal deeper structural insights.
The UNIVERSE+ Online Seminar Series is designed to foster dialogue and collaboration among project partners and those interested in positive geometry.
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