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- W3101412304 abstract "It was recently proposed that a field theory cannot be consistent with quantum gravity if it allows a mode shorter than the Planck length to exit the Hubble horizon. This is called the Trans-Planckian Censorship Conjecture (TCC). We discuss the implications of the TCC on the possible shape of the inflaton potential in single-field slow-roll inflation. We point out that (1) there is generically an initial condition in which the total e-folding number $N_text{total}$ is doubled or more compared to the e-folds necessary for the cosmic microwave background fluctuations, and (2) a sizable negative running of spectral index is generically expected to make $N_text{total}$ small. In concrete setups, we find a stringent constraint on the inflationary energy scale, $V_text{inf}^{1/4} < mathcal{O}(10) , text{TeV}$ with $r < mathcal{O}(10^{-50})$, and the running parameter is bounded above as $alpha_text{s} lesssim - 4 times 10^{-3}$." @default.
- W3101412304 created "2020-11-23" @default.
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- W3101412304 date "2020-01-02" @default.
- W3101412304 modified "2023-09-25" @default.
- W3101412304 title "Trans-Planckian Censorship and single-field inflaton potential" @default.
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- W3101412304 doi "https://doi.org/10.1088/1475-7516/2020/01/008" @default.
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