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Trans-Planckian Censorship and Inflationary Cosmology

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arxiv 1909.11106 v3 pith:C2LSSKPP submitted 2019-09-24 hep-th astro-ph.COgr-qchep-ph

Alek Bedroya , Robert Brandenberger , Marilena Loverde , Cumrun Vafa This is my paper · ORCID
classification hep-thastro-ph.COgr-qchep-ph
keywords cosmologyinflationaryleadsamplitudecensorshipcosmologicalinflationslow-roll
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abstract

We study the implications of the recently proposed Trans-Planckian Censorship Conjecture (TCC) for early universe cosmology and in particular inflationary cosmology. The TCC leads to the conclusion that if we want inflationary cosmology to provide a successful scenario for cosmological structure formation, the energy scale of inflation has to be lower than $10^9$ GeV. Demanding the correct amplitude of the cosmological perturbations then forces the generalized slow-roll parameter $\epsilon$ of the model to be very small ($<10^{-31}$). This leads to the prediction of a negligible amplitude of primordial gravitational waves. For slow-roll inflation models, it also leads to severe fine tuning of initial conditions.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. TransPlanckian Censorship on Dark Dimension Inflation

    hep-th 2026-07 conditional novelty 6.0 of 10

    TransPlanckian Censorship forces dark-dimension inflation into a narrow one-dimension window with a pre-inflationary phase and suppresses tensor modes to r < 10^-10.

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  3. Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    A five-phase bouncing cosmology yields a broken power-law gravitational wave spectrum whose amplitude bound automatically keeps the bounce energy below the Planck scale.

  4. A Non-Inflationary Axion and ALP Misalignment Mechanism

    hep-ph 2025-07 conditional novelty 5.0 of 10

    A thermally mediated, Planck-suppressed symmetry breaking potential can supply the initial axion misalignment that inflationary cosmology normally provides, allowing late-time coherent oscillations without inflation.

  5. Breaking Free from the Swampland of Impossible Universes through the DESI Portal

    astro-ph.CO 2026-05 unverdicted novelty 3.0 of 10

    DESI data indicating evolving dark energy may allow string theory to describe observed universes without violating swampland constraints on constant dark energy.

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