UV physics and the speed of sound during inflation - INSPIRE

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UV physics and the speed of sound during inflation

Francisco G. Pedro
(
- Madrid, Autonoma U. and
- Madrid, IFT
)

Aug 10, 2017

19 pages

Published in:

Eur.Phys.J.Plus 134 (2019) 5, 194

Published: May 9, 2019

e-Print:

1708.03226 [hep-th]

DOI:

10.1140/epjp/i2019-12529-x

Report number:

IFT-UAM-CSIC-17-065

View in:

ADS Abstract Service

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Abstract: (arXiv)

We consider inflation as an effective field theory and study the effects of the addition to the Lagrangian of irrelevant operators with higher powers of first derivatives on its dynamics and observables. We find that significant deviations from the two-derivative dynamics are possible within the regime of validity of the effective field theory. Focusing on monomial potentials we show that the main effect of the terms under consideration is to reduce the speed of sound thereby reducing the tensor fraction, while having little impact on the scalar tilt. Crucially, these effects can arise even when the UV cut-off is well above the inflationary Hubble parameter.

velocity: acoustic
inflation
effective field theory
Hubble constant
cosmological constant
derivative: high
scalar

References(31)

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