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2019

Trans-Planckian Censorship and $k$-inflation

Lin, Wei-Chen, Kinney, William H.

Understand

We propose a more general version of the Trans-Planckian Censorship Conjecture (TCC) which can apply to models of inflation with varying speed of sound.

We find that inflation models with $c_S < 1$ are in general more strongly constrained by censorship of trans-Planckian modes than canonical inflation models, with the upper bound on the tensor/scalar ratio reduced by as much as three orders of magnitude for sound speeds consistent with bounds from data.
In particular, models which satisfy the TCC, and therefore the de Sitter Swampland Conjecture, can still violate the more general condition for non-classicality of trans-Planckian modes.
As a concrete example, we apply the constraint to Dirac-Born-Infeld inflation models motivated by string theory.

Built on

Y. Akrami et al. (Planck), (2019), arXiv:1905.05697 [astro-ph.CO]
Original
1905
Earlier work this paper cites.
S. Mizuno, S. Mukohyama, S. Pi, and Y.-L. Zhang, JCAP 1909
Original
1905
Earlier work this paper cites.
A. Bedroya and C. Vafa, (2019), arXiv:1909.11063 [hep-th]
Original
1909
Earlier work this paper cites.
A. Bedroya, R. Brandenberger, M. Loverde, and C. Vafa, (2019), arXiv:1909.11106 [hep-th]
Original
1909
Earlier work this paper cites.
Y. Cai and Y.-S. Piao, (2019), arXiv:1909.12719 [gr-qc]
Original
1909
Earlier work this paper cites.
A. Berera and J. R. Calderón, (2019), arXiv:1910.10516 [hep-ph]
Original
1910
Earlier work this paper cites.
S. Das, (2019), arXiv:1910.02147 [hep-th]
Original
1910
Earlier work this paper cites.
S. Brahma, (2019), arXiv:1910.04741 [hep-th]
Original
1910
Earlier work this paper cites.
S. Mizuno, S. Mukohyama, S. Pi, and Y.-L. Zhang, (2019a), arXiv:1910.02979 [astro-ph.CO]
Original
1910
Earlier work this paper cites.
M. Dhuria and G. Goswami, (2019), arXiv:1910.06233 [astro-ph.CO]
Original
1910
Earlier work this paper cites.
T. Tenkanen, (2019), arXiv:1910.00521 [astro-ph.CO]
Original
1910
Earlier work this paper cites.
G. Goswami and C. Krishnan, (2019), arXiv:1911.00323 [hep-th]
Original
1911
Earlier work this paper cites.
A. A. Starobinsky, Phys. Lett. B91
1980
Earlier work this paper cites.
D. Kazanas, Astrophys. J. 241
1980
Earlier work this paper cites.
A. H. Guth, Phys. Rev. D23
1981
Earlier work this paper cites.
A. D. Linde, Second Seminar on Quantum Gravity Moscow, USSR, October 13-15, 1981 , Phys. Lett. 108B
1982
Earlier work this paper cites.

Similar

A. Albrecht and P. J. Steinhardt, Phys. Rev. Lett. 48
1982
Cited alongside, same era.
C. Armendariz-Picon, T. Damour, and V. F. Mukhanov, Phys. Lett. B458
1999
Cited alongside, same era.
J. Martin and R. H. Brandenberger, Phys. Rev. D63
2001
Cited alongside, same era.
R. H. Brandenberger and J. Martin, Mod. Phys. Lett. A16
2001
Cited alongside, same era.
J. C. Niemeyer, Phys. Rev. D63
2001
Cited alongside, same era.
J. C. Niemeyer and R. Parentani, Phys. Rev. D64
2001
Cited alongside, same era.
A. Kempf, Phys. Rev. D63
2001
Cited alongside, same era.