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- W3099379002 abstract "The recently measured cutoff, $$k_mathrm{min}=4.34pm 0.50/r_{mathrm{cmb}}$$ (with $$r_{mathrm{cmb}}$$ the comoving distance to the last scattering surface), in the fluctuation spectrum of the cosmic microwave background, appears to disfavor slow-roll inflation and the associated transition of modes across the horizon. We show in this Letter that $$k_{mathrm{min}}$$ instead corresponds to the first mode emerging out of the Planck domain into the semi-classical universe. The required scalar-field potential is exponential, though not inflationary, and satisfies the zero active mass condition, $$rho _phi +3p_phi =0$$ . Quite revealingly, the observed amplitude of the temperature anisotropies requires the quantum fluctuations in $$phi $$ to have classicalized at $$sim 3.5times 10^{15}$$ GeV, consistent with the energy scale in grand unified theories. Such scalar-field potentials are often associated with Kaluza–Klein cosmologies, string theory and even supergravity." @default.
- W3099379002 created "2020-11-23" @default.
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- W3099379002 date "2019-05-29" @default.
- W3099379002 modified "2023-10-16" @default.
- W3099379002 title "Quantum fluctuations at the Planck scale" @default.
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- W3099379002 doi "https://doi.org/10.1140/epjc/s10052-019-6963-5" @default.
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