2 papers
hep-ph2025
Positivity in the Renormalization of Effective Field Theory
You-Peng Liao, Jasper Roosmale Nepveu, Chia-Hsien Shen
We show that the direction of renormalization in effective field theory is constrained by fundamental principles in the infrared$\unicode{x2014}$unitarity, analyticity, and Lorentz…
hep-th2023
Positivity from Cosmological Correlators
Daniel Green, Yiwen Huang, Chia-Hsien Shen +1
Effective field theories in flat space and in anti-de Sitter space are constrained by causality and unitarity, often in the form of positivity bounds. Similar bounds have been hard…