2 papers
gr-qc2025
Primordial Gravitational Waves in Quadratic Gravity
Jisuke Kubo, Jeffrey Kuntz
Quadratic gravity is a fourth-order (in derivatives) theory that can serve as an attractive upgrade to the standard description of gravity provided by General Relativity, thanks to…
hep-th2024
Anti-Instability of Complex Ghost
Jisuke Kubo, Taichiro Kugo
We argue that Lee-Wick's complex ghost appearing in any higher derivative theory is stable and its asymptotic field exists. It may be more appropriate to call it ``anti-unstable" i…