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Trans-Planckian Censorship and Inflationary Cosmology
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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.
Forward citations
Cited by 6 Pith papers
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TransPlanckian Censorship on Dark Dimension Inflation
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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Stochastic Survival near Swampland Boundaries
Surviving inflationary histories develop a universal inward drift near any hard swampland boundary — two times the diffusion over the distance to the edge — regardless of the cutoff's microscopic origin.
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Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology
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.
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A Non-Inflationary Axion and ALP Misalignment Mechanism
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.
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Breaking Free from the Swampland of Impossible Universes through the DESI Portal
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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On the Origin and Fate of Our Universe
A review of Swampland constraints on positive scalar potentials that would cap inflation at about 10^9 GeV and limit the dark-energy era to about two trillion years, if the TransPlanckian Censorship Conjecture is true.
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