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Perturbations in generalized Galileon theories

R. Kolevatov
(
- Lomonosov Moscow State U. and
- Moscow, INR
)
,
S. Mironov
(
- Moscow, INR and
- Moscow, ITEP
)
,
V. Rubakov
(
- Lomonosov Moscow State U. and
- Moscow, INR
)
,
N. Sukhov
(
- Lomonosov Moscow State U.
)
,
V. Volkova
(
- Lomonosov Moscow State U. and
- Moscow, INR
)

Aug 14, 2017

8 pages

Published in:

Phys.Rev.D 96 (2017) 12, 125012

Published: Dec 26, 2017

e-Print:

1708.04262 [hep-th]

DOI:

10.1103/PhysRevD.96.125012

Report number:

INR-TH-2017-018

View in:

reference search13 citations

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Abstract: (APS)

We discuss the approaches by Deffayet et al. (DPSV) and Kobayashi et al. (KYY) to the analysis of linearized scalar perturbations about a spatially flat FLRW background in Horndeski theory. We identify additional, potentially important terms in the DPSV approach. However these terms vanish upon a judicious gauge choice. We derive a gauge invariant quadratic action for metric and Galileon perturbations in L3 and L3+L4 theories and show that actions obtained in the DPSV and KYY approaches follow from this gauge invariant action in particular gauges.

Note:

This is a journal version of the article. The proof of the statement made in Section 3 has been considerably revised. The paper consists of 13 pages

invariance: gauge
perturbation: scalar
Galileon
background
cosmological model
Robertson-Walker

References(32)

Figures(0)

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R. Kolevatov
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)
,
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(
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)
,
N. Sukhov
(
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)
,
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(
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)

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Yong Cai
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