3 papers
hep-th2026
A Dispersive Bootstrap for the Virasoro-Shapiro Amplitude
Yongjun Xu
We study the closed-string tree-level Virasoro-Shapiro amplitude using the dispersive S-matrix bootstrap. For the ten-dimensional maximally supersymmetric four-point amplitude, we…
hep-th2025
Scalar weak gravity bound from full unitarity
Anna Tokareva, Yongjun Xu
Weak gravity conjecture can be formulated as a statement that gravity must be the weakest force, compared to the other interactions in low energy effective field theory (EFT). Seve…
hep-th2025
Running EFT-hedron with null constraints at loop level
Guangzhuo Peng, Long-Qi Shao, Anna Tokareva +1
Implications of general properties of quantum field theory, such as causality, unitarity, and locality include constraints on the couplings of the effective field theory (EFT) coef…