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Theory of Cosmological Perturbations with Cuscuton · Around

2017

Theory of Cosmological Perturbations with Cuscuton

Boruah, Supranta S., Kim, Hyung J., Geshnizjani, Ghazal

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This paper presents the first derivation of the quadratic action for curvature perturbations, $\zeta$, within the framework of cuscuton gravity.

We study the scalar cosmological perturbations sourced by a canonical single scalar field in the presence of cuscuton field.
We identify $\zeta$ as comoving curvature with respect to the source field and we show that it retains its conservation characteristic on super horizon scales.
The result provides an explicit proof that cuscuton modification of gravity around Friedmann-Lemaitre-Robertson-Walker (FLRW) metric is ghost free.

Built on

J. M. Bardeen, Gauge Invariant Cosmological Perturbations
1905
Earlier work this paper cites.
J. M. Bardeen, P. J. Steinhardt, and M. S. Turner, Spontaneous Creation of Almost Scale - Free Density Perturbations in an Inflationary Universe
1983
Earlier work this paper cites.
J. M. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models
2003
Earlier work this paper cites.
N. Afshordi, D. J. Chung, and G. Geshnizjani, Cuscuton: A Causal Field Theory with an Infinite Speed of Sound
2007
Earlier work this paper cites.
N. Afshordi, D. J. Chung, M. Doran, and G. Geshnizjani, Cuscuton Cosmology: Dark Energy meets Modified Gravity
2007
Earlier work this paper cites.

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