Trans-Planckian censorship conjecture from the swampland distance conjecture

Brahma, Suddhasattwa

doi:10.1103/physrevd.101.046013

Cited by 43 publications

(36 citation statements)

References 107 publications

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“…already super-Hubble at the beginning of inflation, the bound can be strengthened, in the same way that the TCC bound is strengthened if we consider preinflation evolution [56,57]. Finally, it has also been pointed out that deriving the TCC from different quantum gravity arguments can, by itself, lead to a refinement of it [58] and can bring it closer to our bound.…”

Section: Upper Bound On the Duration Of Inflationmentioning

confidence: 69%

Entanglement entropy of cosmological perturbations

2020

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We show that the entropy of cosmological perturbations originating as quantum vacuum fluctuations in the very early universe, including the contribution of the leading nonlinear interactions, can be viewed as momentum space entanglement entropy between sub-and super-Hubble modes. The interactions between these modes cause decoherence of the super-Hubble fluctuations which, in turn, leads to a nonvanishing entropy of the reduced density matrix corresponding to the super-Hubble inhomogeneities. In particular, applying this to inflationary cosmology reveals that the entanglement entropy produced by leading order nonlinearities dominates over that coming from the squeezing of the vacuum state unless inflation lasts for a very short period. Furthermore, demanding that this entanglement entropy be smaller than the thermal entropy at the beginning of the radiation phase of standard cosmology leads to an upper bound on the duration of inflation which is similar to what is obtained from the trans-Planckian censorship conjecture.

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Section: Upper Bound On the Duration Of Inflationmentioning

confidence: 69%

Entanglement entropy of cosmological perturbations

2020

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“…[69]). Furthermore, considering that the TCC could be a consequence of the swampland distance conjecture [70], the weak TCC could follow. With these considerations, our toy model showed that the tensor-toscalar ratio could be as high as 10 −5 , although it corresponds to red spectral indices.…”

Section: Discussionmentioning

confidence: 99%

Trans-Planckian censorship and other swampland bothers addressed in warm inflation

Berera

Calderón

2019

Phys. Rev. D

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The implications of the recently proposed Trans-Planckian censorship conjecture (TCC) are analyzed in the context of warm inflation. It is found that for a single-stage accelerated expansion the constraints imposed by the censorship are roughly the same as for cold inflation. Next, we study how a two-stage inflationary expansion with an intermediate radiation-dominated era can alleviate the bounds imposed by the censorship. For a demonstrative toy model we found r < 10 −23 , but can be r < 10 −5 for a weaker form of TCC for the later stages of expansion, while still satisfying the other swampland conditions.

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“…This implies that all the quantum-gravity induced corrections are suppressed at the first stages of inflation, so that the evolutions of cosmological perturbations is the same as in the standard cosmological model. We emphasize some similarity between this picture and other scenarios with a trans-Planckian cut-off For instance, some authors have formulated a trans-Planckian Censorship Conjecture [86][87][88][89][90][91][92], arguing that modes with a length scale smaller than the Planck length must be shielded from classicalizing, in analogy with the Penrose's argument that solutions of GR with naked singularities cannot arise in a full theory. The advantage of nonlocal quantum gravity is that one does not need to postulate the decoupling of trans-Planckian modes, since this is a direct consequence of the ultraviolet asymptotic freedom of the model.…”

Section: Jhep09(2020)056 5 Conclusionmentioning

confidence: 76%

Unattainability of the trans-Planckian regime in nonlocal quantum gravity

Briscese

Modesto

2020

J. High Energ. Phys.

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Based on the ultraviolet asymptotic freedom of nonlocal quantum gravity, we show that the trans-Planckian energy regime is unattainable in laboratory experiments. As physical implications, it turns out that the violation of causality, typical of nonlocal field theories, can never be detected in particle accelerators, while the asymptotic freedom of the theory provides an elegant solution to the so called trans-Planckian cosmological problem.

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Trans-Planckian censorship conjecture from the swampland distance conjecture

Cited by 43 publications

References 107 publications

Entanglement entropy of cosmological perturbations

Entanglement entropy of cosmological perturbations

Trans-Planckian censorship and other swampland bothers addressed in warm inflation

Unattainability of the trans-Planckian regime in nonlocal quantum gravity

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