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gr-qc2026
Toller matrices and the Feynman in spinfoams
Eugenio Bianchi, Chaosong Chen, Mauricio Gamonal
We study the analytic properties and three equivalent representations of the Toller matrices which appear in the causal formulation of spinfoam transition amplitudes fo…
gr-qc2026
Causal spinfoam vertex for 4d Lorentzian quantum gravity
Eugenio Bianchi, Chaosong Chen, Mauricio Gamonal
We introduce a new causal spinfoam vertex for d Lorentzian quantum gravity. The causal data are encoded in Toller -matrices, which add to Wigner -matrices $T^{(+)}+T^{(-)}…
gr-qc2025★ 11 cited
Incorporating Backreaction in One-Loop Corrections in Ultra-Slow-Roll Inflation
Cheng-Jun Fang, Zhen-Hong Lyu, Chao Chen +1
We investigate the one-loop quantum correction to the power spectrum of primordial curvature perturbations in the ultra-slow-roll (USR) inflationary scenario, incorporating the bac…