2 papers
hep-th2026
Imprints of flat space analyticity in de Sitter S-matrix
Jason Kristiano, Ryo Namba, Atsushi Naruko +2
The analytic structure of the flat-space S-matrix provides non-perturbative constraints on low-energy effective field theories based on the properties of high-energy theory. While…
hep-th2025
Exact WKB Formulation of Quantization and Particle Production in Time-Dependent Backgrounds
Ryo Namba, Motoo Suzuki
Divergence in perturbative expansions is where interesting physics takes place. Particle production on time-dependent backgrounds, as one such example, is interpreted as transition…