# Universal Upper Bound on the Inflationary Energy Scale from the Trans-Planckian Censorship Conjecture

21 Jul 2020 Mizuno Shuntaro Mukohyama Shinji Pi Shi Zhang Yun-Long

We study the constraint on the inflationary energy scale from the recently proposed Trans-Planckian Censorship Conjecture (TCC). We find a universal upper bound on the inflationary Hubble expansion rate $H_\text{inf}$ which is solely determined by the reheating temperature $T_\text{rh}$: $H_\text{inf}/M_\text{Pl}\lesssim T_0/T_\text{rh}$, where $T_0$ is the photon temperature today... (read more)

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# Categories

• COSMOLOGY AND NONGALACTIC ASTROPHYSICS
• GENERAL RELATIVITY AND QUANTUM COSMOLOGY
• HIGH ENERGY PHYSICS - THEORY